Different growth and processing traits in males and females of European catfish,Silurus glanis |
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| Institution: | 1. Department of Gametes and Embryo Biology, Institute of Animal Reproduction and Food Research, Polish Academy of Sciences, Tuwima 10, 10-748 Olsztyn, Poland;2. Department of Ichthyology, Faculty of Environmental Sciences, University of Warmia and Mazury, ul. Oczapowskiego 2, 10-719 Olsztyn, Poland;3. Department of Aquaculture, The Stanislaw Sakowicz Inland Fisheries Institute, Olsztyn, Poland;4. Team Domestication in Aquaculture, UR AFPA, University of Lorraine, F-54000 Nancy, France;5. Department of Aquaculture, Szent István University, Gödöllő, Hungary;1. Institute of Hydrobiology, Biology Centre of the Czech Academy of Sciences, České Budějovice, Czech Republic;2. Faculty of Science, University of South Bohemia, České Budějovice, Czech Republic;3. Institute of Computer Science, Czech Academy of Sciences, Prague, Czech Republic;5. Department of Water Management Planning, Vltava River Authority, State Enterprise, Plzeň, Czech Republic;6. Department of Biology, State Enterprise Vltava River Authority, České Budějovice, Czech Republic |
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| Abstract: | Two experiments were developed in France to assess whether growth and processing traits differ for males and females in the European catfish, Silurus glanis. In the first experiment, fish were raised from 5 to 200 g in a pond for 7 months. A significant sex effect is demonstrated in males for live weight at the end of the experiment (males 147.5±5.4 g vs females 132.9±4.9 g) and head index (males 20.6±0.1 % vs females 21.2±0.1 %, P < 0.05). In the second experiment, fish were raised from 885±196 g to 2 266±418 g in a recirculated system at 20.7±1.4 °C for 120 days. A differential growth between the sexes is also registered. Males are heavier and longer (+ 357 g or + 17.0 % and + 6.2 % in length at day 120) and present a higher gutted weight and yield (+ 367 g or + 18.7 %; 95.0±0.9 % vs 93.8±1.8 %) and fillet weight (+ 233 g or + 20.9 %) than females after slaughter. |
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