期刊
AQUACULTURE RESEARCH
卷 46, 期 6, 页码 1384-1395出版社
WILEY
DOI: 10.1111/are.12292
关键词
African catfish; nitrite; growth; stress physiology; methemoglobin; recirculating aquaculture systems
类别
资金
- Dutch Ministry of Economic Affairs, Agriculture and Innovation
The nitrite threshold concentration in rearing water of African catfish (Clarias gariepinus) was assessed. African catfish with an initial mean (SD) weight of 219.7 (57.8) g were exposed to an increasing range of water nitrite from 6 (Control) to 928M nitrite for 28days. Mean (SD) plasma nitrite concentrations increased from 5.0 (3.6) to 32.5 (12.6) M at 928M ambient nitrite. The increase in nitrite was accompanied by gradual increase in plasma nitrate from 41.6 (28.4) M to 420.2 (106.4) M. Haematocrit, haemoglobin, methemoglobin, plasma concentrations of cortisol, glucose, lactate, osmolality, gill morphology and branchial Na+/K+-ATPase activity were not affected. Feed intake, final weight, SGR, FCR and mortality were not affected. We advise not to exceed a water nitrite concentration of 43M (0.6mgL(-1) NO2--N) to prevent the risk of reduced growth and feed intake in African catfish aquaculture.
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