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增氧机的类型及其池塘增氧效果 被引量:3
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作者 廖国璋 《水产科技》 2004年第1期42-45,共4页
溶解氧是池养鱼类赖以生存的重要环境因素之一。池水溶氧量与鱼类的摄食率、饵料系数和生长率有密切关系。池水溶氧量的急剧下降不仅使鱼类食欲不振、生长缓慢,降低鱼类的抗病力,严重缺氧时,会导致鱼类窒息死亡。
关键词 类型 池塘养殖 效果 池水溶 补充增氧 应急
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Effect of dietary supplementation of vitamin C on growth, reactive oxygen species, and antioxidant enzyme activity of Apostichopus japonicus(Selenka) juveniles exposed to nitrite 被引量:4
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作者 骆作勇 王宝杰 +3 位作者 刘梅 蒋克勇 刘明星 王雷 《Chinese Journal of Oceanology and Limnology》 SCIE CAS CSCD 2014年第4期749-763,共15页
Different amounts of vitamin C were added to diets fed to juveniles (2.5+0.15 g) of sea cucumber Apostichopus japonicus (Selenka) in an attempt to reduce the stress response of specimens exposed to nitrite stress... Different amounts of vitamin C were added to diets fed to juveniles (2.5+0.15 g) of sea cucumber Apostichopus japonicus (Selenka) in an attempt to reduce the stress response of specimens exposed to nitrite stress. A commercial feed was used as the control diet and three experimental diets were made by supplementing 1 000, 1 500, or 2 000 mg vitamin C/kg diet to control diet separately in a 45-day experiment. Sea cucumbers were exposed to three different levels (0.5, 1.0, and 1.5 mg/L) of nitrite stress for 4, 8, and 12 h at four time intervals (0, 15, 30, and 45 d). Growth of the animals was recorded during the experiment. Reactive oxygen species (ROS) (i.e. hydroxyl free radical (-OH), malondialdehyde (MDA) and total antioxidant capacity (T-AOC)) and antioxidant enzyme activities (i.e., superoxide dismutase (SOD) and eatalase (CAT)) were measured. Response surface methodology (RSM) was used to analyze the effect of multiple factors on ROS indices and enzyme activities. Weight gain (WG) and special growth rate (SGR) of vitamin C supplementation groups were significantly higher than those of control group (P〈0.05). The levels of-OH and MDA increased under exposure time extending and nitrite concentration increasing, whereas T-AOC level decreased. SOD and CAT activities increased at 4 h and 8 h and decreased at 12 h. During the days in which the animal consumed experimental diets, the levels of-OH and MDA decreased and that of T-AOC increased. This result suggests that diets containing vitamin C could reduce the nitrite stress response in the animals and increase their antioxidant capacity. The multifactor regression equation of growth performance, ROS indices, and duration of feeding results suggest that vitamin C supplementation of 1 400-2 000 mg/kg diet for 29-35 days could reduce effectively the effects of nitrite exposure. 展开更多
关键词 sea cucumber Apostichopus japonicus Selenka vitamin C nitrite stress antioxidant enzyme reactive oxygen species (ROS) response surface methodology (RSM)
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