Tilapia had the worst cold tolerance of other warm water fish, and it does not survive below 10 ° C; so the cold season should be considered by managing water temperature, nutrition, and stocking density in order to avoid mortality and achievement of fingerlings with appropriate weight at the beginning of next season. Three levels of stocking density(0.4,1.2 and 2 /l), water temperature(19-20, 22-23 and 25-26°C) and feeding rate(4, 8 and 12 %body weight) were evaluated base on response surface methodology(RSM), box behenken design(BBD). Fry fed three times a day by trout feed during the 36 days of culture period. Results showed that temperature affect weight, spesefic growth rate and food conversion ratio significantly(p<0.05). water temperature had no significant effect on survivel in all treatments. Feeding rates showed significant effects on final weight and food conversion ratio (p<0.05). Stocking density atteind no significant effect on final weight, specific growth rate, food conversion ratio, although growth decrease slightly by increasing stocking density. Survival has not affected by water temperature, feeding rate and stocking density. According to the resalts it seems that for succesfull overwintering of tilapia larvae, water temperature, feeding rate and stocking density should be kept around 19 centigate degrees, 8 percentage of body weight and 2000 per cubic meters, respectively.

تيلاپيا , درصد غذادهي , دما , تراكم , آب لب شور

تهران موسسه تحقيقات علوم شيلاتي كشور

نمودار، جدول، مصور، رنگي

موسسه تحقيقات علوم شيلاتي كشور 59068