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Auteur (up) Amandé, M.; Ariz, J.; Chassot, E.; Molina, A.D. de; Gaertner, D.; Murua, H.; Pianet, R.; Ruiz, J.; Chavance, P.
Titre Bycatch of the European purse seine tuna fishery in the Atlantic Ocean for the 2003-2007 period Type Article scientifique
Année 2010 Publication Revue Abrégée Aquatic Living Resources
Volume 23 Numéro 4 Pages 353-362
Mots-Clés atlantic Ocean; Bycatch; discards; Purse seining; Tuna fisheries
Résumé Bycatch of several groups of species and their characteristics are presented for the period 2003 to 2007 for the European purse seine tuna fishery operating in the Atlantic Ocean. Data were collected through French and Spanish observer programmes and represented a total of 27 trips corresponding to 2.9% coverage. Bycatch is defined as non-targeted species and small or damaged target species. Bycatch species composition, main species length, sex ratio and the fate of the most common species are presented first. Stratified ratios relative to landings of major commercial tunas were then used to estimate the total bycatch; these ratios were considered the most appropriate variable for extrapolation. Stratification was based on the fishing mode (free school vs. floating object), season (quarters) and spatial areas. The annual average bycatch was estimated at about 6400 t, corresponding to a mean annual value of 80.8 t per 1000 t of tuna landed or 7.5% of the total catch. Tunas represent 83% (67.2 t/1000 t) of the total bycatch, followed by other bony fishes (10%, 7.8 t/1000 t), billfishes (5%, 4.0 t/1000 t), sharks (1%, 0.9 t/1000 t) and rays (1%, 0.9 t/1000 t). Based on estimates of the annual bycatch, 16% was kept on board and sold in local markets.
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ISSN 0990-7440 ISBN Médium
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Numéro d'Appel LL @ pixluser @ collection 56
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Auteur (up) Arrizabalaga, H.; Bruyn, P. de; Diaz, G.A.; Murua, H.; Chavance, P.; Molina, A.D. de; Gaertner, D.; Ariz, J.; Ruiz, J.; Kell, L.T.
Titre Productivity and susceptibility analysis for species caught in Atlantic tuna fisheries Type Article scientifique
Année 2011 Publication Revue Abrégée Aquatic Living Resources
Volume 24 Numéro Pages 1-12
Mots-Clés Analyse; Des; Ecologique; Engin; Gestion; Impact; L'Environnement; Ligne; Longue; Peche; Peches; Risque; Senne; Statistique; Sur; Thoniere
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ISSN 1765-2952 ISBN Médium
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Numéro d'Appel LL @ pixluser @ collection 116
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Auteur (up) BLANCHETON, J.-P.; D'ORBCAS℡, E.R.O.Q.U.E.; LEMARIE, G.; BREUIL, G.; PETOCHI, T.; MARINO, G.; TRIPLET, S.; DUTTO, G.; FIVELSTAD, S.; COEURDACIER, J.-L.
Titre Effects of rearing density on sea bass (Dicentrarchus labrax) biological performance, blood parameters and disease resistance in a flow through system Type Article scientifique
Année 2010 Publication Revue Abrégée Aquatic Living Resources
Volume 23 Numéro 1 Pages 109-117
Mots-Clés Flow through system; Rearing density; Sea bass; Stress; Water quality
Résumé During 84 days, the effects of density on juvenile sea bass (Dicentrarchus labrax) (76 +/- 16 g) were studied in an experimental tank-based flow through system. Performance, stress response and resistance to virus infection were analysed under five stabilized rearing densities: 10, 20, 40, 70 and 100 kg m(-3). Water quality parameters (CO2, total ammonia nitrogen and O-2) were measured and maintained close to the recommended values for farmed sea bass by adjusting water renewal exchange. No significant differences were observed between density treatments, neither on stress response (cortisol) nor susceptibility to nodavirus. With regards to biological performances, the daily feed intake and specific growth rate were significantly lower in fish reared at the 100 kg m(-3) density. Results on the effects of density in sea bass reared in flow through (present study) and in recirculating aquaculture systems (RAS) (Sammouth et al. 2009) were compared as a contribution to the identification of density not affecting health and welfare in farmed sea bass.
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ISSN 0990-7440 ISBN Médium
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Numéro d'Appel LL @ pixluser @ collection 59
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Auteur (up) Brochier, T.; Ecoutin, J.M.; de Morais, L.T.; Kaplan, D.M.; Lae, R.
Titre A multi-agent ecosystem model for studying changes in a tropical estuarine fish assemblage within a marine protected area Type Article scientifique
Année 2013 Publication Revue Abrégée Aquatic Living Resources
Volume 26 Numéro 02 Pages 147-158
Mots-Clés ecosystem model; Life history; marine protected area; Spill-over; trophic level; Tropical estuarine fish assemblage; West Africa
Résumé As marine protected areas (MPAs) are increasingly being utilised as a tool for fishery management, their impact on the food web needs to be fully understood. However, little is known about the effect of MPAs on fish assemblages, especially in the presence of different life history and ecological traits. Modelling the observed changes in fish population structures may provide a mechanistic understanding of fish assemblage dynamics. In addition, modelling allows a quantitative estimate of MPA spill-over. To achieve this purpose, we adapted an existing ecosystem model, OSMOSE (Object-oriented simulator of marine biodiversity exploitation), to the specific case of the presence of fish with multiple life histories. The adapted model can manage 4 main categories of life history identified in an estuary MPA: fish that (1) spend their entire life cycle locally, (2) are present only as juveniles, (3) enter the area as juveniles and stay permanently except during reproduction periods, which occur outside the estuary, and (4) are present occasionally and for a short time for foraging purposes. To take into account these specific life-history traits, the OSMOSE code was modified. This modelling approach was developed in the context of the Bamboung Bolong MPA, located in a mangrove area in the Sine-Saloum Delta, Senegal. This was the ideal case to develop our approach as there has been scientific monitoring of the fish population structure inside the MPA before fishery closure, providing a reference state, and continuous monitoring since the closure. Ecologically similar species were pooled by trophic traits into 15 groups that represented 97% of the total biomass. Lower trophic levels (LTL) were represented by 6 compartments. The biomass of the model species was calibrated to reproduce the reference situation before fishery closure. Model predictions of fish assemblage changes after fishery closure corresponding to the Bamboung MPA creation scenario were compared to field observations; in most cases the model reproduces observed changes in biomass (at least in direction). We suggest the existence of a “sanctuary effect”, that was not taken into account in the model, this could explain the observed increase in biomass of top predators not reproduced by the model. Finally, the annual MPA fish spill-over was estimated at 11 tons (~33% of the fish biomass) from the model output, mainly due to diffusive effects.
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Numéro d'Appel LL @ pixluser @ collection 298
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Auteur (up) Capello, M.; Soria, M.; Potin, G.; Cotel, P.; Dagorn, L.
Titre Effet of current and daylight variations on small-pelagic fish aggregations (Selar crumenophthalmus) around a coastal fish aggregating device studied by fine-scale acoustic tracking Type Article scientifique
Année 2013 Publication Revue Abrégée Aquatic Living Resources
Volume 26 Numéro Pages 63-68
Mots-Clés Agregation; Dispositif De Concentration Des Poissons; Espece Pelagique; Ethologie; Impact De L'Environnement; Poisson Marin; Prospection Acoustique; Variation Journaliere
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ISSN 0090-7440 ISBN Médium
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Numéro d'Appel LL @ pixluser @ collection 283
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