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Registros recuperados: 13
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A Tentative Age-based Assessment of the Northern Stock of European Hake ArchiMer
Mesnil, Benoit; Guichet, Roger.
Due to difficulties in routinely ageing European hake, assessments of the stock have hitherto been carried out using length-based methods, and were thus restricted to pseudo-cohort analyses and long-term equilibrium projections under steady state assomptions. However, given the availability of numerical length-to-age conversion methods, it seems feasible to consider age-based assessments using the methodology of regular ICES working groups. In this paper, attempts are made to derive a time series of catches at age from the length compositions of international catches assembled by the ICES Hake Working Group for the period 1978-1990. The age-length key which is reconstructed in each year is also applied to the length composition of catches by selected...
Tipo: Text
Ano: 1991 URL: https://archimer.ifremer.fr/doc/00394/50568/51259.pdf
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Association du merlu Merlucius Merlucius (L.) et du merlan bleu Micromesistius Poutassou (ROSSO) dans le Golfe de Gascogne ArchiMer
Guichet, Roger; Meriel-bussy, Mireille.
During its seasonal campaigns from July 1965 to November 1967, the Thalassa performed 190 trawl passes in the Gulf of Gascony. These catches, spread out from 35 to 300 metres between the parallels of 44"50' and 47°50' N, showed some similarities between the hake's and the blue whiting's distribution. The highest yields of one frequently match high quantities of the other and vice versa. However, this link is not so clearly demonstrated in all seasons. Moreover, we have noticed that the average weight yields of the two species increase steadily with depth (figure 1). Only sea beds of 180 metres provided different results: whereas blue whiting is in especially large numbers there, hake is less present than at neighbouring levels. It seemed worthwhile to us...
Tipo: Text
Ano: 1970 URL: https://archimer.ifremer.fr/doc/1970/publication-3148.pdf
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Composition du stock de merlu au nord et à l'ouest de l'Irlande (2ème note) ArchiMer
Guichet, Roger; Quero, Jean-claude; Labastie, Jacques.
In a previous paper (C.M.1973/G:5), the authors analyzed the results of a cruise of "Thalassa" carried out in april-may 1972 west of the Irish coast and devoted to hake study. a second cruise has been executed in november 1972 and its results ares presented here.
Tipo: Text Palavras-chave: Campagne chalutage; Irlande; Estimation stock; Merlus.
Ano: 1974 URL: http://archimer.ifremer.fr/doc/00143/25384/23522.pdf
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Détermination de l'age du merlu (Merluccius Merluccjus L.). Problèmes d'interprétation des otolithes ArchiMer
Guichet, Roger; Labastie, Jacques.
Since Hickling's studies in 1933, several authors have used otoliths for age determination of hake. The different results show important divergences in reading, which indicate the complexity of otolith structures and the difficulties of interpretation. The otoliths of european hake display many subannular bands which cannot be identified as winter zones. The first winter ring is often hard to locale and the outer edge is difficult to read. The aim of this paper is to review the recent works and to emphasize the difficulties in reading otoliths of hake.
Tipo: Text Palavras-chave: POISSON MARIN; OTOLITHE; INTERPRETATION / MERLU; ESTIMATION DE L'AGE; ANALYSE DE RESULTAT MERLUCCIUS MERLUCCIUS.
Ano: 1992 URL: http://archimer.ifremer.fr/doc/00394/50565/51256.pdf
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Essai d'évaluation du stock de merlu du Golfe de Gascogne et du plateau celtique ArchiMer
Guichet, Roger; Dardignac, J..
An assessment of the hake stock exploited in the Bay of Biscay and in-the Celtic Sea has been attempted. Schaefer's and Beverton-Holt's methods have been used. Due to the lack or the inadequacy of our data, a number of assumptions have been made which restrict the validity of the conclusions. Nevertheless, both methods agree in showing that a substancial increase in production (50-80 p. 100, as an order of magnitude) could be achieved by a strong reduction of fishing effort (40-60 p. 100). A still larger increase in yield p. recruit could be achieved by a mesh increase, up to 150 mm at least
Tipo: Text
Ano: 1975 URL: http://archimer.ifremer.fr/doc/00397/50794/51555.pdf
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Estimation de la mortalite totale du Merlu ArchiMer
Guichet, Roger.
In this paper the instantaneous total mortality coefficient for hake is estimated., using c.p.u.e. data of La Rochelle deep-sea trawlers from 1968 to 1970. The following two methods are used to calculate the mortality coefficient Z: the first one is obtained with the c·.p.u.e. of two successive year classes for the same year, the second is estimated with the c.p.u.e. of one year class taken in two years rurming. Everywhere, except for the West Ireland area, the total mortality seems to decrease with the age of the fish. Such a result was not observed with the "Thalassa" experimental data in the Bay of Biscay. This suggests a change in fish catchability with age. Generally, there is no great difference between the results of the. two methods. Nevertheless...
Tipo: Text
Ano: 1973 URL: http://archimer.ifremer.fr/doc/00398/50910/51689.pdf
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Le merlan bleu (Micromesistius poutassou) dans le Golfe de Gascogne ArchiMer
Guichet, Roger.
Tipo: Text
Ano: 1968 URL: http://archimer.ifremer.fr/doc/00399/51026/51811.pdf
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Le merlu europeen (Merluccius merluccius L.). Bilan des connaissances biologiques. Evolution de l'exploitation. Evaluations des stocks et mesures de gestion ArchiMer
Guichet, Roger.
European hake is one of the most important commercial species of the North East Atlantic. Its biology is quite well known in spite of age reading problems. This report provides a review of the state of knowledge based on updated data, specially for parameters used in the working groups in charge of stocks assessments. The fisheries for hake are essentially sequential. In recent years fishing mortalities have been moderate and the over exploitation of the stocks is due to the excessive catches of young fish and to the fishing pattern of some fleets. The result of this inappropriate exploitation pattern is dangerous with a decrease of the spawning stock biomass and recrutrnent for the two stocks.
Tipo: Text Palavras-chave: Merlu; Nord Est Atlantique; Biologie; Exploitation; Gestion; Hake; North East Atlantic; Biology; Fisheries; Management.
Ano: 1996 URL: http://archimer.ifremer.fr/doc/00422/53327/54169.pdf
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Observations françaises sur les nurseries du merlu du golfe de Gascogne au nord-ouest de l'Irlande. Essai de synthèse ArchiMer
Guichet, Roger.
Depuis 1965, 19 campagnes de la Thalassa ont été consacrées en totalité ou en partie à l'étude des nurseries du merlu. Plusieurs de ces campagnes ont fait l'objet de notes au CIEM. Dans ce papier nous nous proposons de tenter une synthèse des observations concernant la répartition des premiers groupes d'âge du merlu et, si possible, de calculer l'importance relative des différentes nurseries
Tipo: Text Palavras-chave: Campagne de la Thalassa; Merlu; Nurserie; Répartion géographique.
Ano: 1977 URL: http://archimer.ifremer.fr/doc/00143/25385/23523.pdf
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Qualité des eaux littorales des Pertuis Charentais : Bilan et diagnostic ArchiMer
Rostagno, Bernard; Violleau, Allain; Brun, Céline; Dietrich, Patrice; Fillon, Alain; Goulletquer, Philippe; Guichet, Roger; Kantin, Roger; Legay, Didier; Loubersac, Lionel; Masson, Daniel; Rocher, Gregory; Ryckaert, Mireille; Thomas, Gerard; Fichet, Denis; Guyot, Thierry; Miramand, Pierre; Pigeot, Jacques; Seguignes, Michel.
Cette étude, qui a rassemblé les compétences des instances de l'Etat chargées de la surveillance du milieu littoral (DDE, DDASS, IFREMER, Université de La Rochelle) a permis de dresser, à la veille de l'an 2000, un bilan de la situation environnementale du littoral de la « mer des Pertuis». Ce bilan, diversifié dans sa présentation, passe en revue les points marquants de "l'état de santé" de l'environnement, qu'il s'agisse de pollutions ciblées (chimiques, bactériologiques) ou d'autres nuisances variées. Il met en exergue les points forts et les points faibles en matière d'environnement littoral, et rappelle les efforts mis en oeuvre par les différentes administrations chargées de sa surveillance. Dans un premier temps, plus de 250 références...
Tipo: Text Palavras-chave: Environnement; Qualité eaux; Littoral; Caractéristiques physiques; Economie; Qualité chimique; Qualité bactériologique; Phycotoxines; Biodiversité; Pollution; Recommandations; Pertuis Charentais; Département Charente-Maritime.
Ano: 1999 URL: http://archimer.ifremer.fr/doc/00072/18371/15943.pdf
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Rationalisation de l'échantillonnage biologique pour l'évaluation des stocks des pêcheries marines en golfe de Gascogne ArchiMer
Pelletier, Dominique; Beucher, Helene; Chevalier, Robert; Laurec, Alain; Alperi, J.; Pereda, P.; Guichet, Roger; Dupouy, Herve; Peronnet, Isabelle.
The aim of the project "rationalization of biological sampling for stock assessment of marine fisheries in the bay of Biscay" is to perform statistical methods and computer programs allowing to test prognoses and diagnoses based on estimates of fishing mortalities, recruitments, yields per recruit, and the "gain-loss" function. The project gathers the laboratories of the community working on the Bay of Biscay fisheries, namely - Santander in Spain (1. E. 0) - La Rochelle and Lorient in France (IFREMER). A descriptive study has been carried out. The prepared documents contain a description of the procedures used to collect the information, by each of the laboratories involved, on: - landings - biological samplings. More comprehensive data have been gathered...
Tipo: Text Palavras-chave: Capture; Marine biology; Fisheries; Megrim; Monk; Hake; Data collection; TAC; Bay of Biscay; Stock assessement; Sampling; Statistics; Capture; Biologie marine; Halieutique; Cardine; Baudroie; Merlu; Collecte de données; TAC; Golfe de Gascogne; Evaluation des stocks; Echantillonnage; Statistiques.
Ano: 1991 URL: http://archimer.ifremer.fr/doc/1991/rapport-3621.pdf
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Relations entre le pouvoir de pêche et les caractéristiques des chalutiers de La Rochelle dans la pêche du merlu ArchiMer
Guichet, Roger.
The aim of this study is to define relationships between fishing power and vessel characteristics, and we have only considered in this paper, La Rochelle off-shore trawlers, fishing for hake. Overall length, gross registered tonnage and break horse power are the vessel characteristics taken into account. The relative fishing power bas been calculated according to Eeverton and Holt's method (1954) and for that purpose statistics set up by the Institut des Pêches Laboratory of La Rochelle in 1966-67 and 68. have been used ; only hake catches have been reckoned, and we have considered that two trawlers were fishing at the same place when they went on fishing in the same  ICES sud-area, and at the same time, when the catches were sold during the same month....
Tipo: Text
Ano: 1970 URL: http://archimer.ifremer.fr/doc/00405/51695/52259.pdf
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Répartition bathymétrique saisonnière des poissons de chalut dans le golfe de Gascogne ArchiMer
Guichet, Roger.
Tipo: Text
Ano: 1966 URL: https://archimer.ifremer.fr/doc/00418/52931/53865.pdf
Registros recuperados: 13
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