5Cao L, Wang W, Yang Y, et al. Environmental impact of aquacultureand countermeasures to aquaculture pollution in China[J].aquculture pollution in china,2007,7(14):452-462.
6Peter B. Aquaculture A solution, or source of new problems [J].Nature, 1997,386:109.
7Crab R, Avnimelech Y, Defoirdt T, et al. Nitrogen removaltechniques in aquaculture for a sustainable production [J].aquaculture,2007,270:1 -14.
8Spencer P, Pollock R, Dube M. Effects of un-ionized ammonia onhistological, endocrine, and whole organism endpoints in slimysculpin (Cottus cognatus)[J].aquatic toxicology,2008,90:300-309.
9Randall D J,Tsui T K N. ammonia toxicity in fish[J].MarinePollution Bulletin,2002,45:17-23.
10Kroupova H, Machova J, Svobodova Z. nitrite influence on fish: areview[J].Vet med-Czech,2005,50( 11):461 -471.
