Spatio-temporal patterns and environmental controls of small pelagic fish body condition from contrasted Mediterranean areas

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2017-02-01
Brosset, Pablo
Fromentin, Jean-Marc
Van Beveren, Elisabeth
Lloret, Josep
Marques, Virginie
Basilone, Gualtiero
Bonanno, Angelo
Carpi, Piera
Donato, Fortunata
Kec, Vanja Cikes
De Felice, Andrea
Ferreri, Rosalia
Gasparevic, Denis
Giraldez, Ana
Gücü, Ali Cemal
Iglesias, Magdalena
Leonori, Iole
Palomera, Isabel
Somarakis, Stylianos
Ticina, Vjekoslav
Torres, Pedro
Ventero, Ana
Zorica, Barbara
Menard, Frederic
Saraux, Claire
Small pelagic fish are among the most ecologically and economically important marine fish species and are characterized by large fluctuations all over the world. In the Mediterranean Sea, low catches and biomass of anchovies and sardines have been described in some areas during the last decade, resulting in important fisheries crises. Therefore, we studied anchovy and sardine body condition variability, a key index of population health and its response to environmental and anthropogenic changes. Wide temporal and spatial patterns were investigated by analyzing separately data from scientific surveys and fisheries in eight Mediterranean areas between 1975 and 2015. Results showed that anchovy and sardine body condition as well as maximum size in some areas sharply decreased in most Mediterranean areas along years (except in the Northern Alboran Sea). Despite this general pattern, well-marked environmental differences between sub-regions were highlighted by several analyses and variations in body condition were not found to be homogeneous over all the Mediterranean Sea. Further, other analyses revealed that except for the Adriatic where major changes towards a lower body condition were concomitant with a decrease in river runoffs and chl-a concentration, no concomitant environmental regime shift was detected in other areas. Together, these analyses highlighted the current poor body condition of almost all small pelagic fish populations in the Mediterranean. Yet, global environmental indices could not explain the observed changes and the general decrease in condition might more likely come from regional environmental and/or anthropogenic (fishing) effects. A prolonged state of poor fish body condition, together with an observed reduced size and early age-at-maturity may have strong ecological, economic and social consequences all around the Mediterranean Sea.
PROGRESS IN OCEANOGRAPHY

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Citation Formats
P. Brosset et al., “Spatio-temporal patterns and environmental controls of small pelagic fish body condition from contrasted Mediterranean areas,” PROGRESS IN OCEANOGRAPHY, pp. 149–162, 2017, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/31796.