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Published in last 1 year |  In last 2 years |  In last 3 years |  All Please wait a minute... For Selected: Download Citations EndNote Reference Manager ProCite BibTeX RefWorks Toggle Thumbnails Select Effects of dissolved oxygen and nitrite on the incubation time of Charybdis feriatus egg ZOU Xiong, YANG Ming-qiu, PU Li-yun, LU Jian-xue, XIA Lian-jun, LIU Xin HUBEI AGRICULTURAL SCIENCES    2023, 62 (11): 102-105.   DOI: 10.14088/j.cnki.issn0439-8114.2023.11.018 Abstract （101）      PDF （1671KB）（30）       Knowledge map    Save The effects of dissolved oxygen and nitrite on the incubation time of Charybdis feriatus egg were studied. The results showed that the concentration of dissolved oxygen and nitrite had a significant impact on the incubation time of Charybdis feriatus egg; when the dissolved oxygen content in seawater was within the range of 2~12 mg/L, Charybdis feriatus could be incubated normally. Within this range, as the dissolved oxygen content in seawater increased, the incubation time of Charybdis feriatus egg gradually decreased; nitrite concentration had a significant impact on the incubation duration of Charybdis feriatus egg. When the concentration was lower than 50 mg/L, it was suitable for the incubation of Charybdis feriatus egg. When the concentration of nitrite was lower than 25 mg/L, the incubation duration of Charybdis feriatus egg in each stage was shorter. Reference | Related Articles | Metrics Select 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 Abstract （102）      PDF （1633KB）（33）       Knowledge map    Save 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）. Reference | Related Articles | Metrics page Page 1 of 3 Total 6 records First page Prev page Next page Last page