FN Archimer Export Format PT J TI Sex dimorphism in European sea bass (Dicentrarchus labrax L.): New insights into sex-related growth patterns during very early life stages BT AF Faggion, Sara Vandeputte, Marc Vergnet, Alain Clota, Frederic BLANC, Marie-Odile Sanchez, Pierre Ruelle, Francois Allal, Francois AS 1:1;2:2,3;3:1;4:2,3;5:1;6:2,3;7:1;8:1; FF 1:PDG-RBE-MARBEC-LAAAS;2:;3:PDG-RBE-MARBEC-LSEA;4:;5:PDG-RBE-MARBEC-LSEA;6:;7:PDG-RBE-MARBEC-LSEA;8:PDG-RBE-MARBEC-LAAAS; C1 MARBEC, CNRS, Ifremer, IRD, Univ Montpellier, Palavas-les-Flots, France INRAE, AgroParisTech, GABI, Université Paris-Saclay, Jouy-en-Josas, France MARBEC, CNRS, Ifremer, IRD, Univ Montpellier, Palavas-les-Flots, France C2 IFREMER, FRANCE INRAE, FRANCE INRAE, FRANCE SI PALAVAS SE PDG-RBE-MARBEC-LAAAS PDG-RBE-MARBEC-LSEA UM MARBEC IN WOS Ifremer UMR WOS Cotutelle UMR DOAJ copubli-france copubli-p187 IF 3.752 TC 9 UR https://archimer.ifremer.fr/doc/00691/80288/83391.pdf https://archimer.ifremer.fr/doc/00691/80288/83392.pdf https://archimer.ifremer.fr/doc/00691/80288/83393.pdf https://archimer.ifremer.fr/doc/00691/80288/83394.pdf https://archimer.ifremer.fr/doc/00691/80288/83395.pdf https://archimer.ifremer.fr/doc/00691/80288/83396.pdf https://archimer.ifremer.fr/doc/00691/80288/83397.pdf https://archimer.ifremer.fr/doc/00691/80288/83398.pdf LA English DT Article AB The European sea bass (Dicentrarchus labrax) exhibits female-biased sexual size dimorphism (SSD) early in development. New tagging techniques provide the opportunity to monitor individual sex-related growth during the post-larval and juvenile stages. We produced an experimental population through artificial fertilization and followed a rearing-temperature protocol (~16°C from hatching to 112 days post-hatching, dph; ~20°C from 117 to 358 dph) targeting a roughly balanced sex ratio. The fish were tagged with microchips between 61 and 96 dph in five tagging trials of 50 fish each; individual standard length (SL) was recorded through repeated biometric measurements performed between 83 to 110 dph via image analyses. Body weight (BW) was modelled using the traits measured on the digital pictures (i.e. area, perimeter and volume). At 117 dph, the fish were tagged with microtags and regularly measured for SL and BW until 335 dph. The experiment ended at 358 dph with the sexing of the fish. The sex-ratio at the end of the experiment was significantly in favor of the females (65.6% vs. 34.4%). The females were significantly longer and heavier than the males from 103 dph (~30 mm SL, ~0.44 g BW) to 165 dph, but the modeling of the growth curves suggests that differences in size already existed at 83 dph. A significant difference in the daily growth coefficient (DGC) was observed only between 96 and 103 dph, suggesting a physiological or biological change occurring during this period. The female-biased SSD pattern in European sea bass is thus strongly influenced by very early growth differences between sexes, as already shown in previous studies, and in any case long before gonadal sex differentiation has been started, and thus probably before sex has been determined. This leads to the hypothesis that early growth might be a cause rather than a consequence of sex differentiation in sea bass. PY 2021 PD APR SO Plos One SN 1932-6203 PU Public Library of Science (PLoS) VL 16 IS 4 UT 000644138300061 DI 10.1371/journal.pone.0239791 ID 80288 ER EF