اثر حرارت بر روي رشد و بلوغ فيل ماهي پرورشي (Huso huso)

Effect of temperature on the growth and maturity of beluga (Huso huso)

Long-term duration of ovarian development cycle is an important problem in rearing of sturgeons. This study was done on the probable effects of temperature on the growth and accelerating of maturity in the beluga. For this reason beluga were reared from larval stage to final stage of maturity in 9 years. Results showed underground warm water can decrease duration of ovarian development cycle and fishes reached the maturity when they are 9 years old. Warm water also accelerated growth rate and fish reached to 2.3 kg at the end of the first year and to 4.8 kg at the end of second year. According to our results, beluga need 63540 day-degree to reach maturity in warm water. FCR (food conversation rate) in this experiment for %5, %8 and %11 feeding rate were 3.88, 5.07 and 7.47 respectively. The average of fishes daily growth was 8 g. It can be concluded warm water has an effect an acceleration of growth and maturity of beluga.