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Effects of monthly satiation degree on growth performance, body composition, immunity and water quality of juveniles grass carp
GUO Wei, WANG Min, YANG Hui-jun, MO Ai-jie, YUAN Yong-chao
HUBEI AGRICULTURAL SCIENCES
2023, 62 (11):
106-112.
DOI: 10.14088/j.cnki.issn0439-8114.2023.11.019
In order to explore the effects of monthly satiation degree on the feeding, growth, immunity of juvenile grass carp （Ctenopharyngodon idellus） and the water quality index of farmed aquatic fish ponds, juvenile grass carp with body weight of （18.10 ± 0.09） g was selected as the test subjects for a period of 60 days. The juveniles were fed at four levels of 70%, 80%, 90% and 100% of monthly satiation degree. The results showed that： ① The weight gain rate and specific growth rate of the test fish were significantly positively correlated with the monthly satiety, and the treatment group with monthly satiation degree of 100% showed the best specific growth rate （2.02%/d）, but had no obvious difference compared with the treatment group with monthly satiation degree of 90% （P>0.05）; the feed coefficient of the test fish was significantly negatively correlated with the monthly satiety, the test fish with monthly satiation degree of 90% had the lowest feed coefficient （1.16±0.04）, while the test fish with monthly satiation degree of 70% had the highest feed coefficient （1.43±0.07）. ② Different monthly satiation degrees had a certain impact on the survival rate and morphological indicators of the test fish, among which the test fish with monthly satiation degree of 100% had the lowest survival rate, but their hepotasomatic index and condition factor were the highest. ③ The difference in the muscle nutrient composition of the test fish under different monthly satiety levels was not significant （P>0.05）, while the crude fat content in the whole fish nutrient content was significantly positively correlated with the monthly satiation degree （P<0.05）. ④During the test period, the contents of ammonia nitrogen, nitrate nitrogen and phosphate in the cultured water bodies increased significantly with the increase of monthly satiety （P<0.05）, but the monthly satiety had no significant effect on the nitrogen nitrite nitrogen in the cultured waters and the serum antioxidant index of the test fish （P>0.05）.
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