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A new approach to recruitment overfishing diagnosis based on fish condition from survey data ArchiMer
Ordines, Francesc; Lloret, Josep; Tugores, Pilar; Manfredi, Chiara; Guijarro, Beatriz; Jadaud, Angelique; Porcu, Cristina; Gil De Sola, Luis; Carlucci, Roberto; Sartini, Marina; Isajlovic, Igor; Massutti, Enric.
A new approach to recruitment overfishing diagnosis is presented. We hypothesize that condition of recruits should increase when recruitment failures are caused by fishing activity. This would be a consequence of the increase in trophic resource availability, because the population is smaller than that which the ecosystem could support. Temporal series of hake recruit condition were calculated from MEDITS survey data collected in Mediterranean geographical sub-areas (GSAs) 1, 6, 17 and 19 from 1994 to 2015. Multiple linear regressions were used to analyse the relationship between mean annual condition and abundance of recruits and climatic indices in each GSA. Significant correlations were only detected in GSA 6, where 69% of condition variability was...
Tipo: Text Palavras-chave: Merluccius merluccius; Fishery; Recruits; Condition index; Recruitment overfishing; MEDITS survey.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00513/62458/66762.pdf
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Density dependence in the spatial behaviour of anchovy and sardine across Mediterranean systems ArchiMer
Giannoulaki, Marianna; Petitgas, Pierre; Barra, Marco; Tugores, Pilar; Vasapollo, C.; Iglesias, M.; Leonori, Iole; De Felice, Andrea; Bonanno, A.; Basilone, G.; Mazzola, Salvatore; Bigot, Jean-louis; Machias, Athanassios; Pyrounaki, Maria M..
A spatial indicator—the spreading area index—is used to describe anchovy and sardine spatial distribution in relation to biomass variation and to look for ecosystem differences within the Mediterranean basin. Specifically, the variation in the spreading area index in relation to biomass was examined for different areas of the Mediterranean Sea (i.e. Aegean Sea, western Adriatic Sea, Strait of Sicily, Gulf of Lion, and Spanish Mediterranean waters). In order to capture the spatial variability of the population at different levels of fish density, acoustic survey data for the years of highest, lowest, and intermediate abundance were used. In a subsequent step standardized values of spreading area and biomass were estimated to allow comparisons. Results...
Tipo: Text Palavras-chave: Anchovy; Mediterranean Sea; Sardine; Spreading area index.
Ano: 2012 URL: http://archimer.ifremer.fr/doc/00114/22549/20245.pdf
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