Sibling cannibalism in juvenile barramundi, Lates calcarifer (Actinopterygii: Perciformes: Centropomidae), reared under different light conditions
2011
Jesu Arockiaraj, A.,Cheju National University, Jejudaehakno (Rep. of Korea). Dept. of Marine Biotechnology | Appelbaum, S.,Ben-Gurion University of the Negev, Sde Boker Campus (Israel). The Bengis Centre for Desert Aquaculture
Barramundi, Lates calcarifer (Bloch, 1790), is a popular and valuable species in aquaculture on the Asian and Australian continents. In its culture, cannibalism can cause severe losses during the early stages of development particularly before fish reach a length of about 10 cm. The effect of the two photoperiods, constant darkness and continuous light on the rate of sibling cannibalism in barramundi juveniles reared indoors under intensive conditions was studied. The indoor experimental setup consisted of two separate systems labelled system 1 and 2. System 1 was kept under 24 h of light provided by two 36 watt fluorescent tubes. System 2 was kept under 24 h of darkness except for a short period of 6 min during each feeding time. In both light and dark systems, larger specimens were much more active during feeding. However, the rate of cannibalism was significantly lower under dark conditions
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