Cold Tolerances of F1 Tilapia Hybrids
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Graphical Abstract
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Abstract
The tolerances of 3 F1tilapia hybrids of Oreochromis niloticus(♀)×Oreochromis aureus(♂) to cold temperatures were studied.By artificially lowering the tank water temperature, the death rate, semi-lethal low temperature (LT50), and cumulative survival rate of the fish were monitored to determine the abilities of the F1 tilapia hybridsto survive in cold temperatures. There were significant differences in their cold tolerances among the 3 F1 hybrids. Aiao began to die soon after the water temperature was reduced to 9.6℃, ranging from 9.6℃ to 7.5℃. For Xiang'ao, the lethal temperature ranged from 9.4℃ to 6.7℃; and, it was 8.9℃ to 6.3℃ for Jiao tilapia. LT50 of Aiaowas 8.63℃; that of Xiang'ao, 8.23℃; and, that of Jiao, 7.60℃. It appeared that Jiao was a significantly more hardy tilapiathan either Aiao or Xiang'ao (P < 0.05).
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