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Comparative analysis of oxygen consumption rates between cupped oyster spat of Crassostrea gigas of French, Japanese, Spanish and Taiwanese origins ArchiMer
Goulletquer, Philippe; Wolowicz, Maciej; Latala, Adam; Geairon, Philippe; Huvet, Arnaud; Boudry, Pierre.
Respiration rates of various geographical strains of Crassostrea gigas were compared to assess the respiratory expenditure as a physiological indicator of catabolism (cost of maintenance). Parental oysters, sampled in France (Marennes-Oleron), Japan (Hiroshima), Taiwan (Tunkang) and Spain (Cadix), were differentiated by both their geographic origin and by mitochondrial DNA markers, allowing the distinction between the two closely related taxa Crassostrea gigas and Crassostrea angulata. After reproduction of these parental oysters, respiration rates of spat of each strain, reared under common controlled conditions, were individually estimated at 20 degrees C by using a volumetric microrespirometer. Our results demonstrated that physiological variability...
Tipo: Text Palavras-chave: Pacific Ocean; NE Atlantic; Oyster strains; Hybrids; Crassostrea angulata; Crassostrea gigas; Metabolism; Respiration rates; Océan Pacifique; Atlantique NE; Souches génétiques; Hybrides; Crassostrea angulata; Crassostrea gigas; Métabolisme; Taux de respiration.
Ano: 1999 URL: http://archimer.ifremer.fr/doc/1999/publication-859.pdf
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Definition of a directed fishing effort in a mixed-species trawl fishery, and its impact on stock assessments ArchiMer
Biseau, Alain.
Catch-per-unit effort (CPUE) has frequently been used as an index of abundance and more specifically to calibrate virtual population analysis (VPA). In multi-species fisheries, CPUE calculated from fishing trips targeting the species seems to be more effective for calibration than the classical ratio total landings/total effort. Target species are determined from an analysis of the composition of catches (landings) of each fishing trip, each trip being categorised as to whether it targets the given species or not. It is obvious that existing but not reported discards would affect these results. Classification of trips can be achieved on a single-species basis, each species being considered successively and each trip possibly being relevant for more than...
Tipo: Text Palavras-chave: Pêche pluri-spécifique; Chain tage; Effort de pêche; Espèces-cibles; Métier; Calibration de l'analyse de cohorte; Atlantique NE; Multi-species fisheries; Directed effort; Target species; Metier; Tuned virtual population analysis; Stock assessment; NE Atlantic.
Ano: 1998 URL: https://archimer.ifremer.fr/doc/1998/publication-874.pdf
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