Consulta: creatorFacets:"Morizur, Yvon"
Registros recuperados: 55
Data/hora: 11/06/2024 06:38:57

First results from a pilot survey of recreational fishing in France
Provedor de dados: 5
Autores: Herfaut, Johanna; Levrel, Harold; Thebaud, Olivier; Tranger, Hervé; Berthou, Patrick; Dintheer, Christian; Guyader, Olivier; Morizur, Yvon.
Between 2006 and 2008, Ifremer, in collaboration with the polling institute BVA, implemented a pilot survey of french recreational fisheries. The aim of the survey was to assess the overall population involved in this activity, taking into account the diversity of recreational fishing practices, from fish and shellfish gathering on the seashore to angling and spearfishing. The study was designed to provide first estimates of fishing effort, catches and landings, and economic impacts of recreational fishing. The protocol implemented was two-step. First, a telephone survey of french households, based on a sampling frame of the entire french population of people aged 15+, was carried out to assess the population of fishers and give a first general view of the...
Tipo: Text
Palavras-chave: Recreational fishing; Survey methodology; Catch and effort assessment; Economic impact.
Ano: 2008
URL: https://archimer.ifremer.fr/doc/00502/61368/64984.pdf

Consequences des recents changements de maillage sur les rendements de la flotille langoustiniere lorientaise en Mer Celtique
Provedor de dados: 5
Autores: Morizur, Yvon; Charuau, Anatole.
Some trawlers from Lorient (France) are fishing for Nephrops at the North of 48th parallel. During the last years, the mesh size of their cod-end changed twice. It increased from 45 mm to 60 mm at the end of year 1978 and to 70 mm at the end of year 1979.'. Whereas the change to 60 mm seems to have no immediate- effect on Nephrops landings, the increase from 60 mm to 70 mm results in a loss in Nephrops landings of 30-40 %. That loss in Nephrops landings goes with an increase in some by-catches species as whiting, cod and hake.
Tipo: Text
Palavras-chave: ANE; Celtic Sea Nephrops Malacostraca Catch statistics Crustacean fisheries Yield Fishery management Mesh regulations.
Ano: 1981
URL: http://archimer.ifremer.fr/doc/1981/acte-2345.pdf

Captures accidentelles de mammifères marins sur les filets calés en Manche : Observations réalisées dans le cadre de la première année de réalisation du projet FilManCet (Novembre 2008- Octobre 2009)
Provedor de dados: 5
Autores: Morizur, Yvon; Gaudou, Olivier; Miossec, Dominique; Leblond, Emilie; Toulhoat, Lucile; Gamblin, Caroline.
Up to now there has been no strong investigation on bycatch of marine mammals in the French set net fisheries of the English Channel (ICES areas VIIe,d &amp;IVc) as the EC 812/2004 regulation does not oblige the state members to put observers on board of vessels in the ICES area VII. A study named FilManCet has been started end 2008-beginning 2009 to focus on the bycatch occurring on the set net vessels issued from Boulogne and Dunkerque ports (fisheries in VIId&amp;IVc) and from the ports of North of Brittany. In this study which is conducted by the Fishing Industry, the data are made available to the scientists of Ifremer who has prepared also the sampling scheme for observation at sea. Two observers are employed full time in the North of France coasts...
Tipo: Text
Ano: 2009
URL: http://archimer.ifremer.fr/doc/00004/11524/8105.pdf

Captures accidentelles. Sous-région marine Méditerranée occidentale. Evaluation initiale DCSMM.
Provedor de dados: 5
Autores: Morizur, Yvon; Valéry, Loïc; Claro, Françoise; Van Canneyt, Olivier.
Tipo: Text
Palavras-chave: Méditerranée; Captures accidentelles; Programmes d'observation; Mammifères marins; Tortues marines; Oiseaux.
Ano: 2012
URL: https://archimer.ifremer.fr/doc/00331/44250/43819.pdf

Identification biogéographique des principaux stocks exploités en Manche, relations avec ceux des régions voisines
Provedor de dados: 5
Autores: Bennet, D; Casey, J; Dare, P; Dawson, W; Flatman, S; Hulme, T; Macer, C; Millner, R; Pickett, G; Vince, M; Lorance, Pascal; Souplet, A; Giret, M; Morin, Jocelyne; Berthou, A; Latrouite, Daniel; Morizur, Yvon; Bossy, S; Ozanne, S.
At present, the majority of fisheries are monitored and regulated in areas which are delineated by arbitrary ICES boundaries which do not necessarily have logical or consistent relationships with biological processes or fish movements. The biogeographical identification of Channel stocks is, therefore, an important step towards developing a rational strategy for the management of their fisheries. This synthesis is based on the wide available knowledge which has not been yet entirely exploited with the purpose of stock identification, for 25 commercially important species in the Channel. In addition, principal technics for stock identification are reviewed likewise environmental characteristics of the Channel, which represent fundamental components in...
Tipo: Text
Palavras-chave: Environnement physico chimique; Méthodes d'identification; Migrations; Zones de ponte; Distribution géographique; Espèces exploitées; Identité de stock; Manche; Physical environment; Identification methods; Migrations; Spawning areas; Geographical distribution; Exploited species; Stock identification; Channel.
Ano: 1993
URL: https://archimer.ifremer.fr/doc/1993/rapport-719.pdf

Evolution de l'activite-des flottilles françaises en Mer d'Irlande et en Mer Celtique
Provedor de dados: 5
Autores: Charuau, Anatole; Morizur, Yvon; Rivoalen, Jean-jacques.
Since 1978, the habits of the french fishermen working with bottom trawl in the Irish Sea and in the Celtic Sea were altered (CHARUAU et M0RIZUR, 198l) under the pressure of the new mesh regulation. Two facts are pointed out:  - the shifting, stabilized during 1980 and 198l, of a part of the effort of the vessels fishing for gadoids, from the area VIIa to the areaVIIf  - a tendancy inside the area VIIg of a part of the effort of the Nephrops trawlers to be transferred on benthic fishes when the yield of Nephrops is low.
Tipo: Text
Palavras-chave: Celtic sea; Fishing fleets; Irish sea.
Ano: 1982
URL: http://archimer.ifremer.fr/doc/1982/acte-2342.pdf

Contribution à l'évaluation et à l'évolution de la puissance de pêche des fileyeurs français
Provedor de dados: 5
Autores: Morizur, Yvon; Carn, Nolwenn.
En l'absence de données fines sur l'effort de pêche des fileyeurs, on prend couramment la journée de pêche comme unité d'effort. C'est le niveau disponible pour tous les bateaux. Lorsque l'on prend la journée de pêche comme unité d'effort dans le fileyage, l'on se réfère à une unité de temps qui comporte des opérations de levage et parfois de filage et de levage, et la puissance de pêche dépendra principalement des quantités de filets levés, la durée d'immersion étant un facteur peu variable dans une même pêcherie. Cette étude vise à étudier l'influence de ce facteur sur la puissance de pêche et à étudier le lien avec des paramètres physiques connus. Les analyses effectuées montrent que, pour les années 1996-97, les quantités de filets sont dépendantes de...
Tipo: Text
Palavras-chave: Hake; Sole; Anglerfish; Spider crab; Length of nets; Evolution; Fishing power; Fishing effort; Fixed nets; Merlu; Baudroie; Sole; Araignée; Evolution; Puissance de pêche; Longueur des filets; Effort de pêche; Filets fixes.
Ano: 2000
URL: http://archimer.ifremer.fr/doc/2000/rapport-1243.pdf

Estimation de la mortalite pour quelques stocks de langoustine, Nephrops norvegicus
Provedor de dados: 5
Autores: Morizur, Yvon.
Total mortalities were determined in several Nephrops stocks according to two methods using length distributions with growth parameters : Beverton and holt's Method, end Ssentongo and Larkin's method. We applied these two formulae in conditions which differ from those in which they were established. Therefore validity of methods was certified by simulated length distributions. Apparent- natural mortality values of 0.2-0.3 were obtained from, length distributions of quasi-inexploited stocks. Real mortality differs from apparent mortality in effects of behaviour. Kodels used in Nephrops assessments are discussed.
Tipo: Text
Palavras-chave: ANE; Atlantic Nephrops norvegicus Malacostraca mathematical models growth length weight relationships stock assessment mortality.
Ano: 1982
URL: http://archimer.ifremer.fr/doc/1982/acte-2346.pdf

OBSERVHAL96, campagne d'observations à finalité halieutique
Provedor de dados: 5
Autores: Latrouite, Daniel; Antoine, Loic; Cosson, Nathalie; Danel, Patrick; Desaunay, Yves; Dupouy, Herve; Galgani, Francois; Lorance, Pascal; Morandeau, Fabien; Morizur, Yvon; Rivoalen, Jean-jacques; Sacchi, Jacques; Troadec, Herve.
The scientific cruise Observhal96 took place in August 4-27, 1996 with the underwater system for exploration and intervention « Cyana » and the support vessel « Suroît ». The goal of this IFREMER first use of a man opereted submersible for a fisheries study was to observe fishes and invertebrates in their environment, as well as fishing gears in operation. All the dives, 2 to 5 hours long, took place off Brittany in Atlantic. Five were shalower than 100 meters, nine between 100 and 200 meters, one at 400 meters and for deeper than 1000 meters.  Six dives have been dedicated to in situ study of the impact of fishing gears : observation of the geometry of a monkfish tramel net and analysis of losses during hauling ; tracks of a bottom trawl and relative...
Tipo: Text
Palavras-chave: Fish behaviour; Fishery ecology; Submarine Cyana; Dive; Underwater observation; Comportement des poissons et invertébrés; Ecologie halieutique; Submersible Cyana; Observation sous marine.
Ano: 1996
URL: http://archimer.ifremer.fr/doc/1996/rapport-1554.pdf

Evolution du taux de présence de spermatophore chez les femelles de nephrops norvegicus (L.) (Decapoda : reptantia) et développement ovarien
Provedor de dados: 5
Autores: Morizur, Yvon.
Ovary development and the presence of spermatophore in females of Nephrops norvegicus (L.) (Nephropidae) from South Brittany were studied from July 1976 to October 1978 through size classes. Percentage of females bearing spermatophores increased slowly up to 1978 during which year a sudden and important decrease was observed. The percentage decreased to the lowest value obtained in 1976. A study of ovarian development showed that the proportion of small females taking part in reproduction was greater in 1978 than in 1977. The beginning of the decrease in the percentage of spermatophores present coincided with the beginning of spawning in each size class. It may be explained by the behaviour of ovigerous females which stay in burrows during the incubation...
Tipo: Text
Palavras-chave: Histoire Ifremer.
Ano: 1981
URL: http://archimer.ifremer.fr/doc/1981/publication-5312.pdf

By-catch and Discarding in Pelagic Trawl Fisheries
Provedor de dados: 5
Autores: Morizur, Yvon; Tregenza, N; Heessen, H; Beerow, S; Pouvreau, Stephane.
Incidental mammal catch and the composition of the fish catch were studied in pelagic trawl fisheries in the North-East Atlantic. Several seasonal European fisheries were investigated with scientific observation on the fishing vessels. A total of 379 days at sea were observed . The sampled fisheries were horsemackerel (Dutch, French), herring (Irish), mackerel (UK), pilchard (UK , French) and other French fisheries (hake, tuna, bass, black bream, anchovy). Unintentional catches of dolphins were recorded in four of the investigated fisheries (Dutch horsemackerel, French tuna, French hake and French sea bass) at a rate of 1 dolphin per 100 tow hours; Grey seals were caught in the Irish herring fishery at a rate of 4 individuals per 100 tow hours. The fish...
Tipo: Text
Palavras-chave: Albacore; Bluefin tuna Bass Black bream Whiting Hake Anchovy Pilchard Mackerel Horsemackerel Seal Cetacean Incidental mammal catch Reasons for discarding Discards By catch Pelagic trawl.
Ano: 1996
URL: https://archimer.ifremer.fr/doc/1996/rapport-1236.pdf

Etude sur la pêcherie de langoustines de mer Celtique
Provedor de dados: 5
Autores: Charuau, Anatole; Chesnier, Véronique; Conan, Gérard; Derennes, Marc; Destanque, Catherine; Guenole, Annie; Isifou, Amadou; Jezequel, Michèle; Miossec, Gilbert; Missaoui, Ichmi; Morizur, Yvon; Rivoalen, Jean-jacques.
Introduction : Since 1978, new measures to better manage lobster fisheries were implemented in the Celtic Sea within the context of Community regulations. Meshing, in particular, was set at 60mm, but many owners, in order to maintain sufficient leeway vis-à-vis the regulations and to avoid administrative hassles adopted at the outset fish meshing at 70mm, even 80mm. Certain habits aiming to compensate for the losses due to these increases were established: Adoption of better-performing trawls, increase in the secondary catch and enlargement of the fisheries. At the same time, especially because of strong demand from international bodies, OEM and especially EEC, knowledge about the lobster spread and more reliable assessments were achieved, the main problem...
Tipo: Text
Palavras-chave: Stock assessment; Norway lobster; Celtic sea; Nephrops Norvegicus; Crustacea; Lobster fishery; Mer Celtique; Nephrops Norvegicus; Crustacea; Effort Peche; Sex Ratio; Capture; Relation Taille Poids; Maillage; Chalut; Gestion stock; Peche.
Ano: 1982
URL: http://archimer.ifremer.fr/doc/1982/rapport-2337.pdf

Les rejets dans la pêche artisanale de Manche occidentale
Provedor de dados: 5
Autores: Morizur, Yvon; Pouvreau, Stephane; Guenole, Annie.
Observers were set on board of fishing vessels from North Brittanny ports during one full year (1992-93). This study granted by EC Commission (contract CE/DGXIV-C-1 n° 1992/06) was a first approach for assessing French discards in the western English Channel. It identifies the main species discarded and produces a rough estimate of discard rates and size compositions in each métier targeting fish. The major reasons for variability were explained. Size compositions of catches and discards were provided in order to permit better estimates of the mortality induced by fishing operations. The fixed nets observed were large mesh nets (270 to 360 mm) targeting monkfish and small mesh nets (&lt;200 mm) targeting coastal resources. Netting was found to be more...
Tipo: Text
Palavras-chave: France; Western English Channel; Bottom trawls; Fixed nets; Fisheries; Discards.
Ano: 1996
URL: https://archimer.ifremer.fr/doc/1996/rapport-1730.pdf

Bilan de l’action ObsMer en 2010
Provedor de dados: 5
Autores: Peronnet, Isabelle; Rochet, Marie-joelle; Badts, Vincent; Dimeet, Joel; Dintheer, Christian; Fauconnet, Laurence; Gaudou, Olivier; Larnicol, Alain; Morizur, Yvon; Tetard, Alain.
En 2010 des moyens importants ont continué d’être consacrés à l’observation à la mer tant par la Direction des Pêches Maritimes et de l’Aquaculture (DPMA) que par l’Ifremer, en particulier pour le développement de l’outil informatique pour ce dernier. Les points positifs pour cette année sont la refonte du plan d’échantillonnage et des documents contractuels qui définissent les marchés d’observation, dans une perspective de contrats pluri-annuels ; cet allongement des contrats est un pas vers la stabilisation des observateurs, à même de garantir à terme une meilleure implantation sur le terrain et une meilleure collaboration avec les professionnels ; la mise en place d’une véritable collaboration entre la DPMA, les prestataires d’observation, et l’Ifremer...
Tipo: Text
Ano: 2011
URL: http://archimer.ifremer.fr/doc/00032/14325/11606.pdf

Simulating bio-economic management scenarios for the sea bass (Dicentrachus labrax) fishery in France
Provedor de dados: 5
Autores: Drouot, Bruno; Thebaud, Olivier; Ramat, Eric; Morizur, Yvon; Boude, Jean-pierre.
The fishery for common sea bass (Dicentrarchus labrax) is the fourth most important French metropolitan fishery in value terms, with approximately 5 500 tons landed, and a total turnover of about 52 million euro in 2006. Given its high market value, sea bass is targeted by a range of métiers, resulting in interactions between a large number of fleets. The annual contributions to catches and landings of each of these fleets are highly variable, as are their level of economic dependence towards the species. Sea bass is also an emblematic species for recreational fishermen. Currently, there is no limitation on total allowable catch in this fishery, nor are catch allocations specified at the individual vessel level. The fishery thus faces the traditional...
Tipo: Text
Palavras-chave: Bio-economic modeling; Sea-bass fisheries; Management scenarios.
Ano: 2009
URL: https://archimer.ifremer.fr/doc/00634/74590/74485.pdf

Assessment of sea bass (Dicentrarchus labrax, L.) stock delimitation in the Bay of Biscay and the English Channel based on mark-recapture and genetic data
Provedor de dados: 5
Autores: Fritsch, Manon; Morizur, Yvon; Lambert, E; Bonhomme, Francois; Guinand, B.
Sea bass (Dicentrarchus labrax) fisheries are becoming increasingly abundant along eastern Atlantic coastlines, especially in the ICES sub-areas IV, VII and VIII, but they are still not being managed by the European Union TAC (Total Allowed Catches) system. Scientific information about these sea bass stocks is limited, but the fishery is currently managed or modelled based upon these data, separated into the ICES divisions. Clearly, failure to manage satisfactorily the fishery may lead to a decline in stocks. We therefore investigated the structure of Atlantic sea bass populations at eight microsatellite loci in the Bay of Biscay and the English Channel and, additionally, at five selected loci in Ireland and Scotland. Genetic data showed no significant...
Tipo: Text
Palavras-chave: Population structure; Microsatellite loci; Tagging; Mark recapture; Dicentrarchus labrax.
Ano: 2007
URL: http://archimer.ifremer.fr/doc/2007/publication-2401.pdf

Analyse quantitative et qualitative des captures de tourteaux Cancer pagurus par la flottille de Manche-ouest
Provedor de dados: 5
Autores: Latrouite, Daniel; Morizur, Yvon.
French potters from « Manche ouest » harbours ish edible crab Cancer pagurus in English Channel, Iroise Sea and along north Biscay Bay shelf. Monthly landings of the offshore fleet analysed from logbooks for the period 1985-1987 indicate changes in fishing areas. The mean length of males, the mean length of females and the sex-ratio have been analysed by Principal Component Analysis in 1981-1987 samples. The heterogeneity between catches from different statistical rectangle (30 x 40 nautical miles) was great enough to deduce a way of raising composition from samples to total landings. It also offers the possibility to verifiy and correct declaration on geographical origin of landings.
Tipo: Text
Palavras-chave: Biscay Bay; Catch composition; France; Western Channel; Sampling; Iroise; Edible crab; Cancer Pagurus; Fishing; Golfe de Gascogne; Iroise; Manche; Echantillonnage; Composition des captures; Tourteau.
Ano: 1988
URL: http://archimer.ifremer.fr/doc/1988/acte-1416.pdf

Expérimentations de répulsifs acoustiques commerciaux sur les filets fixes à baudroies en mer d'Iroise - Résultats obtenus au cours de l'année 2008-2009 avec le projet « PingIroise »
Provedor de dados: 5
Autores: Morizur, Yvon; Le Niliot, Ph; Buanic, M; Pianalto, S.
A pinger experiment was carried out on the French trammel net fishery in the marine protected area off the west coasts of Britanny in order to compare acoustic mitigation measures for harbour porpoise. Three types of pinger devices (Aquamark 100, Pinger V02, DDD02) were used for porpoise mitigation in the area where no bycatch estimation has previously been made. The pingers DDD02 were attached at each end of the net near the anchor. The pinger Aquamark and pinger V02 were attached to the headline of the nets and were spaced by 400 m and 200 m respectively. The EC regulation 812/2004 requires a such pilot study. Observers at sea were deployed on board of 10 fishing vessels from Le Conquet and Audierne harbours. During one year, 462 km of control nets (non...
Tipo: Text
Palavras-chave: Trammel; Set net; Halichoerus grypus; Seal; Phocoena phocoena; Harbour porpoise; Acoustic deterrent device; Pinger.
Ano: 2009
URL: http://archimer.ifremer.fr/doc/2009/rapport-6864.pdf

Captures accidentelles. Sous-région marine Manche - Mer du Nord. Evaluation initiale DCSMM.
Provedor de dados: 5
Autores: Morizur, Yvon; Valéry, Loïc; Claro, Françoise; Van Canneyt, Olivier.
Tipo: Text
Palavras-chave: Manche; Mer du Nord; Captures accidentelles; Programmes d'observation; Mammifères marins; Tortues marines; Oiseaux.
Ano: 2012
URL: https://archimer.ifremer.fr/doc/00328/43880/43454.pdf

The problem of discards in fisheries
Provedor de dados: 5
Autores: Morizur, Yvon; Caillart, B; Tingley, D.
Introduction : It is now clear that the world's fishery resources are being subjected to exploitation at or above their capacity to produce maximum sustainable yields. At the same time as these trends are being felt, there is a very large wastage of fishery resources from discarding unwanted catches at sea. At the end of each fishing operation a part of the catch is often returned to the sea after sorting by the fishermen. A 1994 FAO report provided an estimate of global discards in commercial fisheries of 27 millions of tons per year compared to 50 million tons of direct human consumption. A more recent FAO document estimated that discards were in the order of 20 million tons in 1997. The majority of the world's fisheries are multi-species in nature and...
Tipo: Text
Palavras-chave: Marine; Wastage; Overview; World; Social; Economic; Ecology; Biology; Impact; Target; Species; Gear; Fishery; Bycatch; Catch; Discards.
Ano: 1999
URL: http://archimer.ifremer.fr/doc/1999/publication-1237.pdf

Captures accidentelles françaises de mammifères marins sur les filets calés en Manche-mer du Nord et en zones Ciem VII. Observations réalisées durant les deux années du projet FilManCet ainsi que dans le cadre d’Obsmer
Provedor de dados: 5
Autores: Morizur, Yvon; Gaudou, Olivier; Miossec, Dominique; Toulhoat, Lucile; Gamblin, Caroline.
Up to now there has been no strong investigation on by-catch of marine mammals in the French set net fisheries of the English Channel (ICES areas VIIe,d &amp; IVc) as the EC 812/2004 Regulation does not oblige the state members to put observers on board of vessels in the ICES area VII. A study named FilManCet has been started end 2008-beginning 2009 to focus on the by-catch occurring on the set net vessels (whatever the hull length is) issued from Boulogne and Dunkerque ports (fisheries in VIId&amp;IVc) and also from several ports of North of Brittany. In this study which is conducted by the Fishing Industry, the data are made available to the scientists of Ifremer who has prepared also the sampling scheme for observation at sea. Two observers are employed...
Tipo: Text
Palavras-chave: Bycatch; Set nets; English Channel; Marine mammals; Harbour porpoise; Phocoena phocoena; Grey seal; Halichoerus grypus.
Ano: 2011
URL: http://archimer.ifremer.fr/doc/00035/14666/11967.pdf

Observations à bord des navires de pêche professionnelle. Bilan de l'échantillonnage 2011
Provedor de dados: 5
Autores: Dube, Benoit; Dimeet, Joel; Rochet, Marie-joelle; Tetard, Alain; Gaudou, Olivier; Messannot, Cecile; Fauconnet, Laurence; Morizur, Yvon; Biseau, Alain; Salaun, Michele.
Ce document est une synthèse des informations collectées en 2011 à bord des navires de pêche professionnelle dans le cadre de l'action ObsMer. Cette action vise à observer in situ l'activité de pêche et l'ensemble de la capture, particulièrement la partie non retenue, en identifiant les espèces capturées, les tonnages par espèce et en prenant des mesures de tailles.
Tipo: Text
Ano: 2012
URL: http://archimer.ifremer.fr/doc/00109/21976/19586.pdf

Tests d'efficacité du répulsif acoustique CETASAVER à bord des chalutiers commerciaux français Résultats obtenus au cours des années 2007 et 2008
Provedor de dados: 5
Autores: Morizur, Yvon; Le Gall, Yves; Van Canneyt, O; Gamblin, C.
An acoustic repellent was developed by Ixtrawl and Ifremer to mitigate incidental catches of common dolphins in trawl fisheries. The system developed-which bears the name of CETASAVER-was developed after behavioural tests performed on groups of common dolphins. These tests conducted at sea for the European project Necessity showed that the trajectories of animals could be changed by this pinger. The CETASAVER emits a beam directing conical with an opening between 75 and 15 degrees. This allows directional less disturbing environmental noise and must be directed towards the opening of the trawl and the frequency ranges from 30 to 150 kHz. The signals are modulated and pulsed. The average sound level is 178 dB which gives 139 dB at the entrance to the trawl...
Tipo: Text
Ano: 2008
URL: http://archimer.ifremer.fr/doc/2008/rapport-4506.pdf

Fécondité de Nephrops norvegicus dans le golfe de Gascogne
Provedor de dados: 5
Autores: Morizur, Yvon; Conan, Gérard; Guenole, A.; Omnes, Marie-helene.
Females of the Norway lobster Nephrops norvegicus (L.) incubate their eggs under the abdomen for a period of several months. The authors estimated the individual fecundity of N. norvegicus (1) before spawning, and (2) at the end of the incubation period. From these two relationships, they then calculated the average egg loss. Egg loss seems to be relatively higher for small females than for large ones. The mean egg loss estimated for the Bay of Biscay (45%) differs from the only other existing value (75%) calculated by other authors for Portuguese waters. Egg loss may regulate stock-density, and may be a mechanism intervening in stock-recruitment.
Tipo: Text
Palavras-chave: Nephrops norvegicus; Crustacea; Decapoda; Nephrops; Incubation; Spawning; Sexual reproduction; Fecundity.
Ano: 1981
URL: http://archimer.ifremer.fr/doc/1981/publication-2348.pdf

Survie des langoustines (Nephrops norvegicus ) s'echappant d'un cul de chalut
Provedor de dados: 5
Autores: Morizur, Yvon; Charuau, Anatole; Rivoalen, Jean-jacques.
The survival rate of Nephrops escaping through the cod-end was recently studied in the Bay of Biscay. Over the 45mm meshed cod-end was put a 15mm meshed net in order to retain the Nephrops escaping though, the cod-end. Soon after hauling escaped Nephrops were returned on the sea-bed into cages. After an inversion of 60-78 hours, the average survived rate was about 70 %. However it was found increasing with the size of individuals. The value obtained, which is only a result of- the action oh several factors, may be lower than the true value. I he evolution, of this biological parameter according to the mesh size is discussed in the scope of assessments
Tipo: Text
Palavras-chave: Size distribution; Crustacean fisheries; Mesh selectivity; Trawling; Fishing mortality; Survival.
Ano: 1982
URL: http://archimer.ifremer.fr/doc/1982/acte-2339.pdf

Observations sur la croissance du tourteau Cancer pagurus en Manche et en golfe de Gascogne
Provedor de dados: 5
Autores: Latrouite, Daniel; Morizur, Yvon.
La production française de tourteaux provient pour l'essentiel des captures réalisées en Manche et dans le Golfe de Gascogne ; l'appréhension des caractéristiques de croissance pour cette ressource est une contribution nécessaire à l'aménagement de l'exploitation des pêcheries concernées. Des expériences de marquage-recapture effectuées de 1981 à 1984 sur les populations des deux bassins permettent une approche de la croissance de Cancer pagurus pour les deux zones concernées.
Tipo: Text
Palavras-chave: Molt frequency; Increment; Edible crab; Growth; Aquiculture; Bay of Biscay; Channel; Cancer pagurus; Fréquence de mue; Accroissement; Croissance; Cancer pagurus; Tourteau.
Ano: 1988
URL: http://archimer.ifremer.fr/doc/1988/acte-1417.pdf

Note relative à la pêche maritime de loisir et à sa gestion
Provedor de dados: 5
Autores: Le Goff, Ronan; Morizur, Yvon; Levrel, Harold; Biseau, Alain; Veron, Gerard; Drogou, Mickael; Laurans, Martial; Merrien, Claude; Morandeau, Gilles; Caill-milly, Nathalie.
Cette note, après une présentation de l’état des connaissances relatives aux activités de pêche maritime de loisir en France (activités et ressources), passe en revue un certain nombre de mesures d’encadrement envisageables pour une pêche de loisir éco-responsables.
Tipo: Text
Ano: 2012
URL: http://archimer.ifremer.fr/doc/00111/22177/19833.pdf

Les captures accidentelles de cétacés dans les pêches professionnelles françaises en 2011 : rapport national sur la mise en oeuvre du règlement européen (CE) No 812/2004 – (année 2011)
Provedor de dados: 5
Autores: Morizur, Yvon; Demaneche, Sebastien; Dube, Benoit; Gaudou, Olivier; Dimeet, Joel.
The European Regulation 812/2004 aims to assess the incidental catches of cetaceans in fisheries and to limit as much as possible the bycatch. The program Obsmer manages for France all the observations at sea required by various fishery regulations. This program is implemented by the ministry of agriculture and fisheries (Direction des Pêches Maritimes et de l’Aquaculture) and IFREMER. For the European Regulation 812/2004, the effort dedicated to observation on board of vessels during the year 2011 represents 287 days of sea area for static gears in ICES area VIII, and also 299 days at sea for towed gears in ICES areas VII &amp; VIII and also in the Mediterranean area. In addition some 308 days at sea were dedicated to set nets in areas concerned with...
Tipo: Text
Ano: 2012
URL: http://archimer.ifremer.fr/doc/00114/22559/20247.pdf

Projet ENERSENNE. Efficacité énergétique de la senne Danoise. Rapport final
Provedor de dados: 5
Autores: Priour, Daniel; Billar, Jean-yves; Morizur, Yvon; Gomez, Julio.
The objective of the project is firstly, to assess the fuel consumption for the fishing technique of Danish seine including assessing its distribution in each phase of its implementation and secondly, investigate potential improvements in energy consumption. Sensors on the boat and on the gear have been installed. Measurements were carried out during sea trials. The boat and gear were simulated. From these measurements and simulations, we observe that the route and fishing phase have more or less te same consumption (58% and 42%). During fishing phase, the gear focuses the main share of consumption (60%). This energy is transmitted to 2/3 by winches and 1/3 by the propulsion. Areas for improvement were evaluated: Changing the type of winch (electric vs...
Tipo: Text
Palavras-chave: Efficacité énergétique; Senne danoise; Pêche; Energy efficiency; Danish seine; Fishing.
Ano: 2014
URL: http://archimer.ifremer.fr/doc/00243/35383/33897.pdf

La flottille artisanale française de Manche Ouest. Bilan des connaissances
Provedor de dados: 5
Autores: Morizur, Yvon; Berthou, Patrick; Latrouite, Daniel; Veron, Gerard.
A survey made during 1986-1987 on the artisanal fleet of the artisanal fleet in Northern Brittany and Western part of Cotentin allowed to describe this fleet in term of activity and metiers. Catches are given by species and by type of fishing activity. The result permit to outline interactions between the various activities and exploited resources. A summary of knowledge on exploited species is given.
Tipo: Text
Palavras-chave: Flottille; Métiers; Typologie; Interactions; Expèces exploitées; Manche; Fleet; Metiers; Interactions; Exploited species; Channel.
Ano: 1990
URL: http://archimer.ifremer.fr/doc/00422/53390/54252.pdf

Biological sampling of non-quota species.
Provedor de dados: 5
Autores: Dunn, M. R.; Rogers, S. I.; Morizur, Yvon; Tetard, Alain; Aublet, B; Le Niliot, Ph; Miossec, Dominique.
The objective of this study was to develop an effective biological sampling programme for fish species in the English Channel (ICES Divisions Vild and Vile) which are not subject to quota management, and to prepare these data for use in multispecies, multi-fleet models being developed by the Channel Fisheries Study Group. Length and age data were coIlected for six non-quota species, and length data for a further five species. The samples were coIlected over a period of two years from important ports on the French and UK coasts. The exploitation patterns of each species were described by allocating catches from similar catching gears, regions, seasons and target species into common units referred to as métiers. The most important métiers in terms of landed...
Tipo: Text
Palavras-chave: Biological sampling; Commercial species; Exploitation; Fishery management.
Ano: 1996
URL: http://archimer.ifremer.fr/doc/00304/41514/40722.pdf

Utilisation de critères fonctionnels (présence de spermatophore, maturation des ovaires) pour la détermination de la taille et de l'âge à maturité sexuelle des Nephrops norvegicus femelles de la région sud-Bretagne
Provedor de dados: 5
Autores: Morizur, Yvon.
The average length at which female Nephrops norvegicus attain their first maturity was determined during 1977 and 1978 by following the presence of spermatophores and development of the ovaries. During 1978, females were sexually mature at the age of 2 but in 1977 they did not mature before the age of 3. The cumulative maturity curves are sigmoid, due to an overlapping of Gaussian curves. A logistic equation was developed to calculate the percentage of mature females at each length. There is no evidence that the present fishing levels reduce the chances of a female with developing ovaries to be fertilized, since 90 to 100% of such females bear spermatophores.
Tipo: Text
Palavras-chave: Brittany; France; ANE; Crustacea; Nephrops norvegicus; Females; Growth; Sexual maturity.
Ano: 1983
URL: http://archimer.ifremer.fr/doc/1983/publication-2349.pdf

Pouvoir salissant par le phytoplancton de divers filets maillants
Provedor de dados: 5
Autores: Appery, F; Drussel, A; Gestin, Pg; Morizur, Yvon.
La présence de "glu" sur les filets maillants est constatée en Bretagne certaines saisons. Elle diminuerait les rendements de la pêche. Ce phénomène a été aussi relaté au Canada. Il semble que ces salissures soient dues au phytoplancton. Nous avons comparé le pouvoir salissant de divers types de filets rnaillants en étudiant leur colonisation par les diatomées.  
Tipo: Text
Palavras-chave: Salissures; Diatomées; Engins de pêche; Filets maillants.
Ano: 1986
URL: https://archimer.ifremer.fr/doc/00681/79299/81803.pdf

Analyse des captures accidentelles de mammifères marins dans les pêcheries françaises aux filets fixes
Provedor de dados: 5
Autores: Morizur, Yvon; Gaudou, Olivier; Demaneche, Sebastien.
During the years 2008 to 2013 several observations of catches were planned on board of set netters fishing in the bay of Biscay, in the English Channel, in the North sea and in the Mediterranean area (around Corsica). All the observations were done on nets without pingers and they were pooled to provide an average bycatch rate of marine mammals by fleet. Estimates of annual bycatch by using the fishing efforts of the year 2012 were provided by fleet. Harbour porpoise Phocoena phocoena was the most common bycatch in set nets. An average annual estimate of 600 harbour porpoises was obtained for the French fleet; other species recorded in set nets were mainly common dolphin Delphinus delphis, striped dolphin Stenella coeruleoalba and the two species of seals...
Tipo: Text
Palavras-chave: France; Bycatch; Marine mammals; Phocoena phocoena; Set nets; Trammel nets; Gill nets; EU regulation 812/2004.
Ano: 2014
URL: http://archimer.ifremer.fr/doc/00209/32016/30451.pdf

Reproduction de la langoustine, Nephrops norvegicus dans la region sud Bretagne
Provedor de dados: 5
Autores: Morizur, Yvon.
The size and age at sexual maturity of the lobsters was determined by secondary sexual characteristics (1) morphological criteria such as length of P1 protopodite, size of the abdomen, and the presence or absence of ovarian hairs in the female; and (2) functional criteria such as the presence of spermatophores in the female and development of the ovaries. A study of fecundity was carried out after maturation of the ovaries and at the end of incubation. The number of eggs lost during incubation was estimated at 45%. The contribution of different age classes to the global fecundity of the stock was simulated on a model of fecundity by recruits.
Tipo: Text
Palavras-chave: Nephrops norvegicus; Reproduction; Atlantique nord est; France; Bretagne; Finistere sud; Crustacea; Decapoda; Homaridae; Nephrops norvegicus; Incubation; Dimorphisme; Spermatophore; Ovaire; Fecondite; Maturite; Reproduction sexuee.
Ano: 1980
URL: http://archimer.ifremer.fr/doc/1980/these-2338.pdf

Bar codes in fisheries research: development of the "ichthyometer"
Provedor de dados: 5
Autores: Morizur, Yvon; Ogor, Andre; Lespagnol, Patrick.
A patent was registered in 1991 for using bar codes to make up fish measuring board. Collection of data such as the length of the captured fish and sometimes their ages are required in order to manage fishery resources. It is a time-consuming operation as this work is usually carried out throughout the year for each species. The computerization of this phase has been the subject of much research work. Electronic fish measuring boards have been developed in Scotland, Canada, and Spain but they have not spread for a number of reasons. Going beyond these developments, IFREMER designed a more efficient and new open-ended fish measuring system - the ichthyometer - which features higher flexibility by using the bar code principle
Tipo: Text
Ano: 1994
URL: http://archimer.ifremer.fr/doc/1994/publication-2347.pdf

Fécondités individuelle et par recrue du homard européen Homarus gammarus (L.) des cotes françaises
Provedor de dados: 5
Autores: Latrouite, Daniel; Morizur, Yvon; Raguenes, Gerard.
Several relationships between the fecundity and the weight or the size of females have been studied for three different (based on "eye-index") stages of incubation. The relationship between the average weight of eggs at the beginning of incubation and the size of the females shows that the egg size varies according to the female's size. Loss of eggs during incubation has been studied ; the average loss between the two extreme stages of incubation is around 27%. This is a lowered value of what accurs during the whole incubation period. Egg losses are greater for small females than for big females. The annual frequency of spawning and size at first maturity have been determined in for differents fishing effort than by the commercial size.
Tipo: Text
Palavras-chave: Maturity; Fecundity per recruit.; Reproduction; Europe; France; Lobster; Aquiculture; Homarus gammarus; Fecundity; Fécondité par recrue; Fécondité; Maturité; Reproduction; Homarus gammarus; Homard.
Ano: 1984
URL: http://archimer.ifremer.fr/doc/1984/acte-1404.pdf

Captures accidentelles. Sous-région marine Golfe de Gascogne. Evaluation initiale DCSMM.
Provedor de dados: 5
Autores: Morizur, Yvon; Valéry, Loïc; Claro, Françoise; Van Canneyt, Olivier.
Tipo: Text
Palavras-chave: Golfe de Gascogne; Captures accidentelles; Programmes d'observation; Mammifères marins; Tortues marines; Oiseaux.
Ano: 2012
URL: https://archimer.ifremer.fr/doc/00329/44067/43638.pdf

Mortalité du tourteau Cancer pagurus provoquée par le dinoflagelle parasite : Hematodinium sp.
Provedor de dados: 5
Autores: Latrouite, Daniel; Morizur, Yvon; Noel, Philippe; Chagot, Dominique; Wilhelm, G.
Unusural crab mortality in winter led us to identify a Hematodinium like parasitic dinoflagellate in the blood of edible crabs Cancer pagurus. Crabs from several fishing areas (the English Channel, the Iroise sea, the bay of Biscay, off Scotland) and from one area of the Channel shore were examined. The crab parasit was found everywhere we investigated and throughout the year. The prevalence which was found independant of the intermolt stage, sex and size of crabs was higher inshore than offshore. The pathogenicity is assumed to differ according to season.
Tipo: Text
Palavras-chave: Edible crab; Pathology; Bay of Biscay; Iroise sea; Channel; Parasite; Mortality; Hematodinium; Bitter crab desease; Dinoflagelle; Aquiculture; Cancer pagurus; Mortalité; Hematodinium; Cancer pagurus; Tourteau; Pathologie.
Ano: 1988
URL: http://archimer.ifremer.fr/doc/1988/acte-1418.pdf

Captures accidentelles. Sous-région marine Mers celtiques. Evaluation initiale DCSMM.
Provedor de dados: 5
Autores: Morizur, Yvon; Valéry, Loïc; Claro, Françoise; Van Canneyt, Olivier.
Tipo: Text
Palavras-chave: Mers celtiques; Captures accidentelles; Programmes d'observation; Mammifères marins; Tortues marines; Oiseaux.
Ano: 2012
URL: https://archimer.ifremer.fr/doc/00329/43982/43554.pdf

Evaluation de la perte d'oeufs lors de l'incubation chez nephrops norvegicus (L.) dans la région Sud-Bretagne, France
Provedor de dados: 5
Autores: Morizur, Yvon.
Loss of eggs during the incubation period in ovigerous females of Nephrops norvegicus from the Bay of Biscay is calculated using two different methods. The first calculates the egg loss from incubation stage A to stage D. The second calculates the loss between the end of ovary maturation and incubation stage D. The first method may contain a bias which decreases the loss estimation : loss of eggs during trawling may be higher in stage A than in stage D. In the Bay of Biscay, the loss of eggs in ovigerous females of Nephrops norvegicus would be about 45-50% for the entire incubation period. Our result is quite different from the 75% obtained by other workers in Portuguese waters. Loss of eggs during incubation which may be due mainly to predation may be a...
Tipo: Text
Palavras-chave: Histoire Ifremer.
Ano: 1980
URL: http://archimer.ifremer.fr/doc/1980/publication-5311.pdf

Incidental mammal catches in pelagic trawl fisheries of the North East Atlantic
Provedor de dados: 5
Autores: Morizur, Yvon; Tregenza, Nick; Heessen, Henck; Berrow, Simon.
The marine mammals catch rate of pelagic trawling in the North-east Atlantic has not previously been assessed by direct observation. A study was funded by the European Commission to collect information on the catches of fish and mammals by several pelagic trawl fisheries from England, France, Ireland and Netherlands. This paper presents a summary of the results, as far as the by catch of marine mammals is concerned, between 1994-1995. It was not possible to carry out observations of all the pelagic trawl fisheries but a total of eleven fisheries were investigated in this study. In one fishery (Irish herring (Thunnus) trawling), four grey seals (Phoca vitulina) were caught in separate trawls during slightly more than 100 hours trawling. Cetaceans (dolphins)...
Tipo: Text
Palavras-chave: Netherlands France Eire ANE; Atlantic Stenella Dicentrarchus labrax Merluccius Thunnus Trachurus trachurus Phoca vitulina Clupea harengus Fish catch statistics Midwater trawls.
Ano: 1997
URL: http://archimer.ifremer.fr/doc/1997/acte-2340.pdf

Differentiation de juveniles de Chlamys varia et Chlamys opercularis
Provedor de dados: 5
Autores: Morizur, Yvon.
The recent developments in collecting techniques for spat of Chlamys operoularis and Chlamys varia make it necessary to find criteria for separating these two species at early life stages. Biométrie criteria for differenciating between species have been found to be usable on individuals of a height superior to 3 mm. A quick différenciation of smaller individuals is possible by observation, under light microscope, of the périostracum external morphology on left valves.
Tipo: Text
Palavras-chave: Chlamys; Aquaculture techniques; Juveniles.
Ano: 1977
URL: http://archimer.ifremer.fr/doc/1977/acte-2343.pdf

Observations ichtyologiques effectuées en 2000
Provedor de dados: 5
Autores: Quero, Jean-claude; Du Buit, M.h.; Iglesias, S; Morizur, Yvon; Soulier, L; Vayne, Jean-jacques.
During 2000, Carcharhinus obscurus and Grammicolepis brachiusculus are recorded from the first time from the Bay of Biscay. From the European Atlantic the second specimens of Himantolophus albinares and Seriola carpenteri, and the third specimens of Lepidion schmidti and Caranx crysos, are recorded. From 200 to 300 Ranzania laevis have been caught off the Bay of Biscay and off the Celtic Sea.
Tipo: Text
Palavras-chave: European Atlantic; Ranzania laevis; Seriola carpenteri; Caranx crysos; Himantolophus albinares; Lepidion schmidti; Grammicolepis brachiusculus; Carcharhinus obscurus; Atlantigue européen; Ranzania laevis; Seriola carpenteri; Caranx crysos; Himantolophus albinares; Lepidion schmidti; Grammicolepis brachiusculus; Carcharhinus obscurus.
Ano: 2001
URL: http://archimer.ifremer.fr/doc/2001/publication-3661.pdf

Le répulsif à cétacés : performances acoustiques requises
Provedor de dados: 5
Autores: Le Gall, Yves; Origne, Laurent; Scalabrin, Carla; Morizur, Yvon.
Acoustic deterrent devices could be an appealing solution to tackle accidental cetacean by-catches in pelagic trawls or in fishing net gears. The bibliographical data on two species (Harbour porpoise and bottlenosed dolphin) have been analyzed in terms of audiogram, discomfort noise level that could lead to behavioural changes, sensory fatigue, and threshold for permanent hearing injuries. It is possible, on the basis of the above data, to characterize an efficient annoyance sound threshold which is not harmful to the species to be protected. Taking into account the properties of the sound waves propagation in the marine environment and according to the required range, the minimal amplitude of the repulsive sound to emit is proposed. Accordingly, the...
Tipo: Text
Palavras-chave: Wave propagation; Behaviour; Audiogram; Capture; Cetacean; In fishing net gear; Pelagic trawl; Acoustic deterrent; Propagation onde; Comportement; Audiogramme; Capture; Cétacé; Filet; Pêche artisanale; Chalutage pélagique; Répulsif acoustique.
Ano: 2004
URL: http://archimer.ifremer.fr/doc/2004/acte-1124.pdf

De l'interaction entre la peche et les mammiferes marins
Provedor de dados: 5
Autores: Morizur, Yvon; Antoine, Loic.
The exploitation of the living marine resources should take into account the effects on marine ecosystems. It consequently includes direct and indirect impacts of fishing activities on marine communities of non-market value for the fishing industry. Protecting the marine species victims of by-catch such as sea mammals is essential as it could be a serious threat for endangered species -See COM (1999) 363 final. The entire group of cetaceans are among the protected species listed by CITES against over-exploitation through international trade. Similarly, several international agreements on cetaceans conservation have been signed, including the Agreement on the Conservation of Small Cetaceans of the Baltic and North Seas (ASCOBANS), the ACCOBAMS agreement for...
Tipo: Text
Palavras-chave: Catche; Cetacean; Marine ecosystem; Fishing; Mammal; Marine living resources.
Ano: 2003
URL: http://archimer.ifremer.fr/doc/2003/publication-1552.pdf

Les baudroies ou lottes, espèces majeures de la pêche française: situation et perspectives
Provedor de dados: 5
Autores: Dupouy, Herve; Andro, M; Avrilla, J.l.; Fifas, Spyros; Kergoat, Bernard; Morizur, Yvon; Mtimet, M; Pennober, J.p; Rivoalen, Jean-jacques.
Tipo: Text
Palavras-chave: North East Atlantic; France; Trade analysis; Commercial species; Angler; Monk; SEM; Débarquement; Recrutement; Engins de pêche; Lophius budegassa; Lotta lotta; Lophius piscatorius; Baudroie; Lotte.
Ano: 1993
URL: https://archimer.ifremer.fr/doc/1993/rapport-2187.pdf

Avis sur la pêche en plongée d'ormeaux à Ouessant
Provedor de dados: 5
Autores: Talidec, Catherine; Laurans, Martial; Morizur, Yvon.
Tipo: Text
Ano: 2013
URL: https://archimer.ifremer.fr/doc/00167/27843/79369.pdf

Utilisation de caracteres sexuels secondaires pour la determination de la taille a maturite sexuelle de Nephrops norvegicus dans la region Sud-Bretagne
Provedor de dados: 5
Autores: Morizur, Yvon.
In crustaceans, size at first maturity is often determined by secondary sexual characters. The present work tries to determine the size at first maturity in Nephrops norvegicus from South-Brittany area with the development of some secondary sexual characters. We study a qualitative character - the presence or absence of ovigerous setae in females and biométrie characteristics - the width of the second abdominal segment in females, the length of the propod at the first pereiopod in males and females - The study of the relative growth of the propod length shows that males may reach sexual maturity at 19mm carapace length. The first maturity in females is reached at 23.5mm later than the coming out of the ovigerous setae. That carapace length is obtained...
Tipo: Text
Palavras-chave: ANE; France Nephrops norvegicus length weight relationships sexual maturity.
Ano: 1979
URL: http://archimer.ifremer.fr/doc/1979/acte-2344.pdf

Les métiers du filet fixe en France (Régions 1, 2 et 3)
Provedor de dados: 5
Autores: Pouvreau, Stephane; Morizur, Yvon.
This study provides some background on the set nets and the use of the gears. The various metiers using set nets are presented by region and maritime basin detailing the target species. The physical characteristics of nets (type, mesh), the number of vessels engaged in the activity, fishing areas, the amount of material used and the composition of the catch are inventoried by target species. Intraspecific selectivity for the main target species of set nets is examined in light of the available size composition of catches of turbot, brill, monkfish, pollack, red mullet, bass, common sole, rays, hake, spider crab, lobster. Few differences exist between the nets (single layer) and trammel nets except for the lobster. Minimum mesh sizes are suggested by target...
Tipo: Text
Ano: 1995
URL: http://archimer.ifremer.fr/doc/00049/16036/13511.pdf

Note on the recent French studies on by catch and pingers in the English Channel
Provedor de dados: 5
Autores: Morizur, Yvon; Hassani, Sami; Le Niliot, Philippe; Gamblin, Caroline; Toulhoat, Lucile; Pezeril, Sylvain.
The English Channel comprised the ICES areras VIIe and VIId which are more or less a part of the North Sea area as delimitated by Ascobans. Two studies (Pingiroise and FilManCet) were conduced in that area. Filmancet study comprises two different areas: North Brittany and Nord Pas de Calais (Figure 1). The main objectives are to quantify accidental catches of marine mammals in set nets and identify solutions to limit them. Pingiroise is a study dedicated to the set net fishery in the Iroise area at the west of Brittany. The three objectives of that study in a marine protected area was to make comparative trials with pingers, to determine the bycatch in set net fishery operating inside and around the Marine protected area and to estimate the abundance and...
Tipo: Text
Ano: 2010
URL: http://archimer.ifremer.fr/doc/00020/13132/10149.pdf

Bilan de l’action ObsMer en 2011
Provedor de dados: 5
Autores: Dimeet, Joel; Rochet, Marie-joelle; Badts, Vincent; Dintheer, Christian; Dube, Benoit; Fauconnet, Laurence; Gaudou, Olivier; Messannot, Cecile; Morizur, Yvon; Tetard, Alain.
En 2011 le programme d’observation a continué à mobiliser des ressources substantielles, et à perfectionner ses outils et produits : évolution et suivi du plan d’échantillonnage, numérisation des bordereaux de terrain, analyse des refus d’embarquements par les professionnels, et édition d’un document de restitution des observations à l’intention des professionnels. L’équipe a également poursuivi ses efforts d’accompagnement du développement de la base de données halieutique et des logiciels qui l’environnent.  Il est regrettable que ces efforts ne soient pas terminés et que de nouvelles difficultés viennent toujours compliquer et retarder la livraison d’une base de données enfin opérationnelle. Les progrès dans l’utilisation des données d’observation à la...
Tipo: Text
Ano: 2012

Catalogue international des activités des flottilles de Manche, approche des interactions techniques
Provedor de dados: 5
Autores: Tetard, A; Boon, M; Bennett, D; Berthou, Patrick; Bossy, S; Casey, J; De Clerck, R; Delpech, Jean-paul; Dintheer, C; Giret, M; Large, P; Latrouite, Daniel; Lemoine, Michel; Millner, R; Morizur, Yvon; Ozanne, S; Palmer, D; Pawson, M; Pickett, G; Vince, M.
This work is the result of collaboration between the English, French, Channel Isles and Belgian laboratories which are involved in a study of the English Channel. Its subject is the activities of fleets and fleet interactions, and it complements other work on the biogeographical identification of Channel fish and shellfish stocks (published), and on modelling the fleets' interactions as they exploit the resources (in preparation). The concept of a métier is defined as being the use of one fishing gear to catch one or several species targeted during a particular season in a given area. On this basis, 74 métiers were identified during 1989-90. For each métier we give a brief description of the catching gear, the target species and most usual by-catch, the...
Tipo: Text
Palavras-chave: Fisheries management; Fishing effort; Technical interactions; English Channel; Métier; Gestion des pêcheries; Distribution de l'effort de pêche; Interactions techniques; Manche; Métiers.
Ano: 1993
URL: http://archimer.ifremer.fr/doc/1993/rapport-704.pdf

Comparaison de methodes de decomposition de distribution polymodales de frequences de longueurs en distributions unimodales successives (NORMSEP-MIX-Maximums successive maximums), application aux "bossus" (Pseudolithus elongatus ) du Congo
Provedor de dados: 5
Autores: Le Guen, J.c; Morizur, Yvon.
Length measurements on Pseudotolithus elongatus ' samples from the Congo were recorded in the 60s. Subsamples were collected in order to be "aged" by otoliths' reading. The size frequency distributions were splitted into successive unimodal distributions by different methods. Their results were compared. The results obtained from the "successive maximums' method" were similar to those from the "otoliths' reading." The programs NORMSEP and MIX gave results far more difficult to interpret biologically speaking in spite of their mathematical quality. Because many length frequency distributions of a cohort are symmetrical in nature, we suggest applying the "successive maximums' method"if there is no evidence of normality
Tipo: Text
Palavras-chave: Frequency analysis; Size distribution; Pseudotolithus elongatus; Sciaenidae; Pisces.
Ano: 1989
URL: http://archimer.ifremer.fr/doc/1989/rapport-2336.pdf

Les pêcheries françaises du chalutage à bar : analyse de séries temporelles 1999-2007
Provedor de dados: 5
Autores: Morizur, Yvon; Meunier, M; Huet, Jerome; Martin, S.
A displacement of the fishing effort of the French pelagic trawlers from anchovy to the seabass fisheries is observed. A such situation on a non-quota managed species requires to analyse carefully the evolution in the status of seabass stocks. The evolution of fishing effort, the production and the landings per unit of effort were studied from 2000 to 2007 for the bottom trawling and for the pair pelagic trawling in the ICES sub-areas VIII and VII. The fishing effort was assessed by using a threshold on the landings by month in order to select the most effective fishing effort as representing 75 % of the effort concerned with seabass landings. Length compositions and age-length keys were used to calculate the cpue-at-age series. A total mortality value was...
Tipo: Text
Palavras-chave: Fishing mortality; Recruitment; Abundance index; Fishing effort; Trawling; Seabass; Dicentrarchus labrax; Mortalité par pêche; Recrutement; Indice d'abondance; Effort de pêche; Chalutage; Bar commun; Dicentrarchus labrax.
Ano: 2009
URL: http://archimer.ifremer.fr/doc/2009/rapport-7303.pdf