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Diet and feeding of juvenile common two-banded sea bream, Diplodus vulgaris (Teleostei: Sparidae), in the eastern central Adriatic Sea

Published online by Cambridge University Press:  17 May 2023

Svjetlana Krstulović Šifner Open the ORCID record for Svjetlana Krstulović Šifner [Opens in a new window]  and
Mate Šantić
Svjetlana Krstulović Šifner*
Affiliation:
Department of Marine Studies, University of Split, Ruđera Boškovića 37, 21000 Split, Croatia
Mate Šantić
Affiliation:
Faculty of Natural Sciences and Mathematics, University of Split, Ruđera Boškovića 33, 21000 Split, Croatia
*
Corresponding author: S. Krstulović Šifner; Email: ssifner@unist.hr
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Abstract

The diet and feeding of juvenile common two-banded sea bream, Diplodus vulgaris, in the eastern central Adriatic Sea was studied to better understand local ecosystem dynamics in this region. Stomach contents of 140 individuals with total length (TL) between 22 and 106 mm, collected by small beach seines from February to November, were analysed. Food items identified in stomachs belonged to 16 prey groups: Copepoda, Gastropoda, Teleost eggs, Ostracoda, Polychaeta, Bivalvia, unidentified Crustacea, Amphipoda, Decapoda, Cumacea, Echinoidea, Anisopoda, Euphausiacea, Mysidacea, Branchiopoda and Isopoda. Overall, planktonic copepod crustaceans were the most important prey group (percentage index of relative importance, %IRI = 78.9), followed by gastropods (%IRI = 14.9). All other prey groups had much lower %IRI values and thus were of less importance. Fish size was an important factor influencing food composition. Planktonic copepods were the most important prey in juveniles of smaller sizes (up to 76 mm TL), whereas large-sized juvenile individuals (>76 mm TL) mainly consumed benthic prey, such as gastropods, polychaetes and bivalves. Feeding intensity was very high as indicated by the low vacuity index.

Keywords

Adriatic SeadietDiplodus vulgarisfeedingjuvenile
Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 103 , 2023 , e36
Copyright
Copyright © The Author(s), 2023. Published by Cambridge University Press on behalf of Marine Biological Association of the United Kingdom

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