Effect of larval and prey density, prey dose and light conditions on first feeding common dentex (Dentex dentex L.) larvae |
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| Authors: | Gemma Giménez & Alicia Estévez |
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| Institution: | Unitat de Cultius Experimentals, Centre de Sant Carles de la Ràpita –IRTA, Ctra. Poble Nou Km 6, Tarragona, Spain;
Xarxa de Referència en Aqüicultura XRA |
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| Abstract: | Initial larval stocking density, prey density, daily prey ration and light conditions (light intensity and photoperiod) were tested for common dentex larval rearing under experimental conditions. Experiments continued until the first peak of larval mortality. The best results in larval survival were obtained with an initial stocking density of between 10 and 40 larvae L?1, fed with at least 10 rotifers mL?1, maintaining ratios of 500–1000 rotifers larva?1, with one or two adjustments of prey density per day. The use of more than 2000 rotifers larva?1 or three daily adjustments of live prey density had negative effects on larval survival. The best light conditions for common dentex larval rearing were found using a photoperiod of 24 h L:0 h D and an intensity of at least 3.4 μmol m?2 s?1. |
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| Keywords: | zootechnics first feeding PNR larval density rotifer density light intensity photoperiod |
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