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Registros recuperados: 10
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An investigation of human vs. technology-induced variation in catchability for a selection of European fishing fleets ArchiMer
Mahevas, Stephanie; Vermard, Youen; Hutton, Trevor; Iriondo, Ane; Jadaud, Angelique; Maravelias, Christos D.; Punzon, Antonio; Sacchi, Jacques; Tidd, Alex; Tsitsika, Efthymia; Marchal, Paul; Goascoz, Nicolas; Mortreux, Serge; Roos, David.
The impact of the fishing effort exerted by a vessel on a population depends on catchability, which depends on population accessibility and fishing power. The work investigated whether the variation in fishing power could be the result of the technical characteristics of a vessel and/or its gear or whether it is a reflection of inter-vessel differences not accounted for by the technical attributes. These inter-vessel differences could be indicative of a skipper/crew experience effect. To improve understanding of the relationships, landings per unit effort (lpue) from logbooks and technical information on vessels and gears (collected during interviews) were used to identify variables that explained variations in fishing power. The analysis was undertaken by...
Tipo: Text Palavras-chave: Catchability; Fishing power; GAM; GLM; Skipper skill; Technical characteristics.
Ano: 2011 URL: http://archimer.ifremer.fr/doc/00049/16043/15172.pdf
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Analyse des puissances de pêche des chalutiers et des abondances apparentes des espèces de la pêcherie démersale de mer celtique ArchiMer
Perodou, Jean-bernard.
Fishing power analysis leads to determine a typology of fleet which depends on target species. Three factors are examined : port of origin, engine power and type of trawl. Specific abundance index analysis leads to determine a diagram of principal stages of vital cycle : juvenile, reproductive adult and recovery adult. Then calculs are made in value for all species combined : we obtain thus an economical index by location and season.
Tipo: Text Palavras-chave: Mer Celtique; Indice économique; Abondance apparente; Typologie des flottille; Puissance de pêche; Celtic Sea; Economical index; Abundance index; Fleet typology; Fishing power.
Ano: 1988 URL: https://archimer.ifremer.fr/doc/1988/rapport-1573.pdf
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Contribution à l'évaluation et à l'évolution de la puissance de pêche des fileyeurs français ArchiMer
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
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Contribution des DCP fixes et derivants a l'accroissement de la puissance de peche des navires de peche thoniere ArchiMer
Le Gall, Jy.
Tuna world fisheries yield 3 million tons per year; the increase rate of whole production is constant and sustained since 30 years. This original figure for marine fisheries is due to enlargement of tuna fleets and fishing grounds over all the world ocean, the continuous increase of tuna fishing power by in board equipment and remote sensing equipment for searching and scouting (on board, aircraft, satellite, telecommunication_). During the last 20 years, the log-associated tuna fishing has contributed to the local individual and tuna fleets efficiency and fishing power either for large industrial tuna seiners by radio-equipped buoys on natural (debris) or artificial man-made logs. The same trend is noted for numerous artisanal tuna and large pelagic...
Tipo: Text Palavras-chave: Attracting techniques; Fishing power; Fishing technology; Remote sensing; Tracking; Tuna fisheries; Ultrasonic devices.
Ano: 2000 URL: http://archimer.ifremer.fr/doc/00042/15297/12656.pdf
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Estandarización del esfuerzo de pesca ejercido sobre el abadejo (Genypterus blacodes) en aguas Argentinas. Período 1986-1996. OceanDocs
Cordo, H.D..
If the fishing effort is properly standardized, the catch per unit of effort may be proportional to biomass (C/f=q x B(med)). A multiplicative factorial model was applied to the ling Genypterus blacodes catch and effort data by the Argentine bottom trawl fleet recorded between 1986 and 1996. The relative fishing power of the fleet strata was estimated and the effort standardized to obtain normalized CPUEs. Provided they were estimated in the same spatial and temporal situation, there were no differences between the normalized CPUE and the nominal CPUE because ling is caught mainly as by-catch in the Argentine hake fishery. A general picture of the spatial and temporal distribution of ling as reflected by the commercial fleet operations was also obtained.
Tipo: Journal Contribution Palavras-chave: Catch/effort; Fishing effort; Variance analysis; Fishing power; Mathematical models; Fishing power; Fishing effort; Mathematical models; Http://aims.fao.org/aos/agrovoc/c_29792; Http://aims.fao.org/aos/agrovoc/c_24027; Http://aims.fao.org/aos/agrovoc/c_24199.
Ano: 2001 URL: http://hdl.handle.net/1834/1868
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Estimación de los poderes de pesca relativos de la flota dealtura convencional merlucera argentina. Zona patagónica: 41°-48°S OceanDocs
Irusta, C.G.; Aubone, A.; Simonazzi, M.A.; Ibañez, P.M..
In this paper detailed mathematical description of the generalized lineal model used and data grouping criteria are presented in order to estimate the relative fishing power of four categories of the hake ice-chilled fleet. The analysis was focused to the patagonian sector (41°-48°S) of the hake total distribution area.The fleet has systematically operated in the same fishing areas between 1989-1993. The variables that better explain in yields trends of each vessel category were analyzed. The fishing power of vessels with power higher than 1200 HP has been raising since 1990 because of increasing efficiency. These vessels generate three times more fishing mortality than the standard vessels (lower than 700 HP)
Tipo: Journal Contribution Palavras-chave: Gadoid fisheries; Catch/effort; Mathematical models; Fishing power; Fishing vessels; Fishing mortality; Fishing fleet.
Ano: 1997 URL: http://hdl.handle.net/1834/5791
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Etude d'une gestion optimale des pecheries de langoustine et de poissons demerseaux en mer Celtique. Tome 2 ArchiMer
Charuau, Anatole; Biseau, Alain.
The theory of the evaluation of discards applied in phase 1 to the main eight species is described. Then, for each one, the biological parameters are calculated and diagnosis based on length cohorts analysis JONES (1981) are proposed The gadoids, whiting and cod, are heavily exploited and the catches are always recruitment dependant. The bottom species (monks, megrim, rays and Nephrops) are fully exploited or lightlhy over - exploited. Using the fisheries statistics of the data basis about the Celtic Sea, a first classification of fleets is proposed with the individual fishing powers.
Tipo: Text Palavras-chave: Puissances de pêche; Rejet; Espèce démersale; Mer Celtique; Fishing power; Discard; Demersal species; Celtic Sea.
Ano: 1989 URL: https://archimer.ifremer.fr/doc/1989/rapport-1562.pdf
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Hake catchability by the French trawler fleet in the Bay of Biscay: estimating technical and biological components ArchiMer
Mahevas, Stephanie; Trenkel, Verena; Doray, Mathieu; Peyronnet, Arnaud.
Several factors affect trawl catchability: (i) gear and vessel technical characteristics, (ii) anthropogenic factors, and (iii) biological factors. The objectives of this study were to assess the relative contribution of each factor to variations in hake (Merluccius merluccius) landings by the French trawler fleet operating on the shelf of the northern Bay of Biscay (ICES Subdivision VIIIa). Using generalized linear models, the impact of technical and anthropogenic factors was evaluated using landings per unit effort (lpue) obtained from logbooks. Variations in hake lpue were explained primarily by anthropogenic factors. For studying the biological components of catchability, the results of a scientific trawl survey in July 2006 involving three similar...
Tipo: Text Palavras-chave: Accessibility; Beam trawl; Catchability; Fishing power; GLMM; Spatial distribution.
Ano: 2011 URL: http://archimer.ifremer.fr/doc/00021/13244/10287.pdf
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Puissance de peche et relations avec les caracteristiques techniques des navires. Exemple de flottilles pratiquant le chalutage en Mediterranee ArchiMer
Perodou, Jean-bernard; Andrianavaly, Jean.
The topic of this work is to analyse two sets of fishing statistics, one concerns ships which landed their catches at Sète during the 88-94 period, the other ships which landed their catches in different fish markets of Lion's gulf during the 94-97 period. Cpue are treated by a log-linear model with three qualitative variables which provides fishing powers of ships, abundance index of species in monthly strata and in annual strata. These three factors are revealed to be statistically significant and form the following hierarchy : first fishing power of ships, secondly monthly index and thirdly annual index of abundance of species. Engine power is revealed to be a minor explicative factor of differences between fishing powers of ships. Two other explicative...
Tipo: Text Palavras-chave: Chalutiers du golfe du Lion; Indice d'abondance; Puissance de pêche; Modèle linéaire; Statistique de pêche; Lion's gulf trawlers; Abundance index; Fishing power; Linear model; Fishing statistic.
Ano: 1999 URL: https://archimer.ifremer.fr/doc/1999/rapport-1574.pdf
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Technological Development and Fisheries Management ArchiMer
Eigaard, Ole Ritzau; Marchal, Paul; Gislason, Henrik; Rijnsdorp, Adriaan D..
Many marine fish stocks are overexploited and considerable overcapacity exists in fishing fleets worldwide. One of the reasons for the imbalance between resource availability and fishing capacity is technological development, which continuously increases the efficiency of the vessels—a mechanism referred to as “technological creep.” We review how the introduction of new and more efficient electronic equipment, gear design, engines, deck equipment, and catch-handling procedures influences the capture efficiency (catchability) of commercial fishing vessels. On average, we estimate that catchability increases by 3.2% per year due to technological developments, an increase often ignored in fisheries management. The documentation and quantification of...
Tipo: Text Palavras-chave: Catchability; Fishing mortality; Fishing power; Fisheries management; Fleet capacity; Technological development.
Ano: 2014 URL: https://archimer.ifremer.fr/doc/00222/33368/35784.pdf
Registros recuperados: 10
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