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Seasonal patterns of body condition and stable isotopes of two small pelagic fish along a latitudinal gradient of the Northwestern Mediterranean Sea

AuthorsLloret Lloret, Elena ; Albo Puigserver, Marta CSIC ORCID CVN ; Giménez, Joan CSIC ORCID ; Navarro, Joan CSIC ORCID ; Pennino, Maria Grazia; Bellido, José M.; Coll, Marta CSIC ORCID
KeywordsSmall pelagic fish
Trophic ecology
Body condition
Stable isotopes
Issue DateJul-2020
CitationAbstracts volume VII International Symposium on Marine Sciences: 251-252 (2020)
AbstractSmall pelagic fish are key elements for the functioning of the marine food webs. In recent decades, these species have shown important changes in terms of biomass, landings, growth and body condition in the Northwestern Mediterranean Sea (Saraux et al., 2019). Despite recent studies, seasonal and spatial information about changes in biological and ecological traits of these species is still missing. In this study, we analyse the temporal patterns ofbody condition, reproduction period and trophic ecology of two important Mediterranean small pelagic fish, the European anchovy (Engraulis encrasicolus) and the European sardine (Sardina pilchardus), along a latitudinal gradient in the Northwestern Mediterranean Sea. Individuals of both species were sampled monthlyin three areas along the Catalan coast (Roses, Barcelona and Tarragona harbours) during a complete year. Fatmeter values (measure of lipid content) were recorded and Kn (relative condition index) and GSI (gonadosomatic index) were calculated. We also measured the stable isotope composition (δ13C and δ15N) to assess the trophic ecology at spatial and seasonal scales. Results revealed spatial and temporal variations for both species in terms of body condition. Kn and fatmeter peaked during the months of March to August for sardines, with a high accumulation of reserves before the reproduction period due to the capital breeding behaviour of this species. GSI values of sardines were highfrom September to Februarywith higher GSI values in Barcelona and Roses than in Tarragona. Instead, anchovies, being income breeders (Albo-Puigserver et al.,2017), presented lower seasonal variability on fat reserves and Kn and maximum GSI values from May to September, with a peak of reproduction in July and a shorter reproduction period in Roses. Isotopic values also showed seasonal variations for both species with differences between areas. In general, we observed better body condition for both species when compared to studies from 2013 (Albo-Puigserver et al.,2019), probably related to food availability. This multidisciplinary approach provides insights into the interplay of the energetic distribution and feeding behaviour of two highly commercial small pelagic fish in the Mediterranean Sea, along a latitudinal gradient and can be of use to understand the fluctuations on their population dynamics and recent trends
DescriptionVII International Symposium on Marine Sciences (ISMS 2020), 1-3 July 2020 (Barcelona).-- 2 pages
Publisher version (URL)https://isms.cat/wp-content/uploads/2020/09/libro-ISMS-2020.pdf
Appears in Collections:(ICM) Comunicaciones congresos
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