Parasitism, condition and reproduction of the European hake (Merluccius merluccius) in the northwestern Mediterranean Sea

D. Ferrer-Maza 1 J. Lloret 1 M. Munoz 1 E. Faliex 2 S. Vila 1 P. Sasal 3
1 Department of environmental sciences
2 CEFREM - Centre de Formation et de Recherche sur les Environnements Méditérranéens
3 CRIOBE - Centre de recherches insulaires et observatoire de l'environnement
Abstract : It is well known that parameters relating to physical condition and reproduction of fish provide essential data for estimating the productivity of exploited populations, as is the case with the European hake (Merluccius merluccius) in the northwestern Mediterranean Sea. Although parasitism might affect these parameters, research in this area is very scarce (and in the case of the Mediterranean almost non-existent). This study evaluates for the first time the potential link between parasitism, condition and reproduction of the European hake. Indicators of fish energy reserves (total lipid content in liver and gonads) and reproductive capacity (fecundity, egg quality and atresia) were evaluated, as were the prevalence and intensity of infection by metazoan parasites. The results indicate that the impact of anisakid nematodes is mostly negative and occurs mainly when hake are allocating their energy reserves to gonadal development. Although the results reveal a link between parasitism, condition and reproduction, we concluded that the northwestern Mediterranean hake population is in equilibrium with its metazoan parasites, which are not causing severe impairment to their physical condition or reproductive capacity.
Keywords : atresia condition indices energy reserves fecundity Merluccius merluccius parasites
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Journal articles
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Submitted on : Thursday, February 4, 2016 - 3:37:15 PM
Last modification on : Saturday, April 20, 2019 - 1:54:01 AM

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D. Ferrer-Maza, J. Lloret, M. Munoz, E. Faliex, S. Vila, et al.. Parasitism, condition and reproduction of the European hake (Merluccius merluccius) in the northwestern Mediterranean Sea. ICES Journal of Marine Science, Oxford University Press (OUP), 2014, 71 (5), p. 1088-1099. ⟨10.1093/icesjms/fst217⟩. ⟨hal-01267574⟩

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