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| Registros recuperados: 10 | |
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| Kell, Laurence T; Fromentin, Jean-marc. |
| Reference points are important elements of fisheries management and the supporting scientific advisory frameworks. However, fish stocks can fluctuate extensively over a large range of spatial and temporal scales independent of human exploitation and there has been a classical tendency to assume a dichotomy, i.e., that changes in fish populations are primarily attributable either to exploitation or to environmental variability. Therefore we look at variability in surplus production and examine the relative impacts of the environment and exploitation on the productivity of North Atlantic albacore (Thunnus alalunga). The analysis revealed that variations were driven by environmental effects. It was also found that substantial variations in time-series of... |
| Tipo: Text |
Palavras-chave: Thunnus alalunga; Albacore; Fisheries management; FLR; Reference points; Stationary processes; Surplus production.. |
| Ano: 2011 |
URL: http://archimer.ifremer.fr/doc/00192/30282/28758.pdf |
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| Ortiz De Zarate, Victoria; Bertignac, Michel. |
| In this study, an attempt is made to estimate natural mortality rate for North Atlantic albacore. We implement a spatially aggregated tag-attrition model to analyse the results of an albacore tagging experiment conducted in the Bay of Biscay from 1988 to 1991. The model predicts probabilities of the possible fates of tagged fish and the tags that they carry. The model includes several parameters consisting of catchabilities by fleets involved in recaptures and a combination of natural mortality plus emigration from the study area. Model fitting is carried out by finding the maximum of a multinomial likelihood function. Effect of reporting rate values on the estimations are evaluated and several hypothesis on the pre-mixing period of the tagged fish... |
| Tipo: Text |
Palavras-chave: Bay of Biscay; Attrition rate; Model; Natural mortality estimation; Albacore. |
| Ano: 2001 |
URL: http://archimer.ifremer.fr/doc/2001/publication-977.pdf |
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| 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 |
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| Nikolic, Natacha; Lauretta, Matthew; Patucca, Audrey; Morandeau, Gilles. |
| We compiled and analysed logbook data from the French trawl albacore fishery covering the period 1991–2015. The dataset comprised catch and effort data for the French fleet operating in the Bay of Biscay and Celtic Sea, as well as spatiotemporal and gear characteristics. Generalized linear modelling was used to model spatial, seasonal, environmental, and gear covariates of fleet CPUE rates. A long-term index of relative abundance is provided that can be integrated into the stock assessment of North Atlantic albacore. The analysis revealed higher albacore CPUE associated with relatively low sea surface temperature and distinct seasonal effects. The derived abundance trend for the French trawl fishery agreed with the estimated time series of stock abundance... |
| Tipo: Text |
Palavras-chave: Albacore; Catch; Atlantic; Trawl; Fisheries; Stock. |
| Ano: 2018 |
URL: https://archimer.ifremer.fr/doc/00461/57256/59283.pdf |
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| Nikolic, Natacha; Bourjea, Jerome. |
| Because one of the most common problems in fisheries is the definition of management units, we propose in this paper a bibliometric review focusing on the differentiation of Albacore populations, Thunnus alalunga, among and within oceanic regions (Atlantic, Pacific and Indian Oceans, and Mediterranean Sea). This paper is the first step of a current work on a global review of Albacore tuna using an international aquatic database (ASFA). For the present purpose, 367 publications, mainly composed of articles (64%), but also conference papers, proceedings and reports (24%), and books (12%), were analyzed. We will see that the concept of the stock and its delimitation is controversial because of the divergence of results. Such a conclusion makes us believe in... |
| Tipo: Text |
Palavras-chave: Albacore; Stock; Structure; Distribution; Thunnus alalunga. |
| Ano: 2013 |
URL: http://archimer.ifremer.fr/doc/00149/25990/24085.pdf |
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| Fromentin, Jean-marc. |
| In the recent past, it has been put forward that recruitment of the North Atlantic albacore, East Atlantic bluefin tuna and North Atlantic swordfish could be related to the North AtlanticOscillation (NAO). In this document, the biological processes behind the NAO/recruitmentrelationship are further investigated. Then, the possible relationship between the East Atlanticbluefin tuna recruitment was re-investigated. The linear relationship appeared to be only due to the low frequency signal, both BFT recruitment and NAO displaying a pseudo-cyclic upwardtrend, but year-to-year fluctuations were not synchronous. The superposed epoch analysis, thatwas conducted to test for possible non-linear and non-monotonous relationship did not reveal any clear connection.... |
| Tipo: Text |
Palavras-chave: North Atlantic Oscillation; Recruitment; Bluefin; Albacore; Swordfish; Migration patterns; Time series; Spatially disaggregated data. |
| Ano: 2002 |
URL: http://archimer.ifremer.fr/doc/00194/30498/28908.pdf |
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| Nikolic, Natacha; Puech, Alexis; Chouvelon, Tiphaine; Munschy, Catherine; Bodin, Nathalie; Brach-papa, Christophe; Potier, Michel; West, Wendy; Knoery, Joel; Zudaire, Iker; Dhurmeea, Zahirah; Degroote, Maxime; Cedras, Maria; Evano, Hugues; Bourjea, Jerome. |
| The GERMON project had several aims i) to understand the populations’ structure between albacore tuna southwest of the Indian Ocean and southeast Atlantic, ii) to determine the origin of juveniles observed in South Africa iii) to improve the understanding of the biology field (Size/Size and Size/Weight; reproduction and feeding area; trophic linkages) and iv) to initiate work on chemical analyzes and adaptation of the albacore species to its environment. These aims have been held and the results allow a better understanding of the management albacore. A general summary of results is presented in Part 9. |
| Tipo: Text |
Palavras-chave: Germon; Thunnus alalunga; Génétique; Stock; Structure; Connectivité; Chimie; Reproduction; Alimentation; Habitat; Albacore; Thunnus alalunga; Genetic; Stock; Structure; Connectivity; Chemical; Reproduction; Feeding behavior; Habitat. |
| Ano: 2015 |
URL: http://archimer.ifremer.fr/doc/00293/40461/39152.pdf |
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| N’Goran Ya, N.; Norström, V.; Diouf, T.; Pianet, R.; Hervé, A.. |
| Ce document présente un bilan statistique résumé de l’activité de la flottille des canneurs et senneurs FIS 6 de 1991 à 2001. Les données historiques de 1969 à 1990 ont été décrites dans un document antérieur (Diouf et Fonteneau 1999). Les données de 1991 à 2001 de ce document ont été révisées et complétées pour l’année 2001. Le document donne des indications sur les caractéristiques des flottilles (type de pêche par catégorie en nombre), les efforts de pêche par type et catégorie de taille des navires, le nombre de carrés de 1° visités par la flottille par année, les prises, les efforts standardisés et les PUE par espèce pour les canneurs et les senneurs, ainsi que les prises par classes de tailles par trimestre pour chacune des trois espèces et pour les... |
| Tipo: Journal Contribution |
Palavras-chave: Pêche thonière; Albacore; Listao; Patudo; Canneurs; Senneurs; Prises/efforts; Compositionspécifique; Composition en taille Tuna fisheries Fishery statistics. |
| Ano: 2003 |
URL: http://hdl.handle.net/1834/392 |
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| Registros recuperados: 10 | |
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