Fry rearing is one of the important stage which aims at obtaining high growth and survival for production of fingerlings required for stocking into grow out ponds as well as rehabilitation in natural habitat. This exp...Fry rearing is one of the important stage which aims at obtaining high growth and survival for production of fingerlings required for stocking into grow out ponds as well as rehabilitation in natural habitat. This experiment was conducted with the purpose to test the effect of dietary crude protein level (CP %) of feeds prepared from similar feed ingredients in different ratios on growth performance and survival rate of Rohu fry (Labeorohita). An initial density of 100 fry/m2 was maintained in hapa fixed in the cemented tank. The dietary CP% level of feed tested were 20% CP, 25% CP, 30% CP, and 35% CP fed at 5% body weight. The experiment ran for 53 nursing days. The results showed that there was no significant difference (P > 0.05) in the growth rate (g/day) of fry among treatments. Rather group fed with higher protein level grew comparatively better indicating possibility of increasing need of protein in diets. However, the survival rate (%) of rohu fry was significantly different (P < 0.05) in each tested CP% level of feed. Highest survival (82%) of fry was found in the feed of CP 35% and lowest (56%) in the feed of CP 25%. It was predicted that feed with increasing level of CP % in diet is essential for increasing survival rate.展开更多
文摘Fry rearing is one of the important stage which aims at obtaining high growth and survival for production of fingerlings required for stocking into grow out ponds as well as rehabilitation in natural habitat. This experiment was conducted with the purpose to test the effect of dietary crude protein level (CP %) of feeds prepared from similar feed ingredients in different ratios on growth performance and survival rate of Rohu fry (Labeorohita). An initial density of 100 fry/m2 was maintained in hapa fixed in the cemented tank. The dietary CP% level of feed tested were 20% CP, 25% CP, 30% CP, and 35% CP fed at 5% body weight. The experiment ran for 53 nursing days. The results showed that there was no significant difference (P > 0.05) in the growth rate (g/day) of fry among treatments. Rather group fed with higher protein level grew comparatively better indicating possibility of increasing need of protein in diets. However, the survival rate (%) of rohu fry was significantly different (P < 0.05) in each tested CP% level of feed. Highest survival (82%) of fry was found in the feed of CP 35% and lowest (56%) in the feed of CP 25%. It was predicted that feed with increasing level of CP % in diet is essential for increasing survival rate.
