Relative sensitivities of common freshwater fish and ...
|Title||Relative sensitivities of common freshwater fish and invertebrates to acute hypoxia|
|Author(s)||M. J. Landman, Michael R. van den Heuvel, N. Ling|
|Journal||New Zealand Journal of Marine and Freshwater Research|
|Abstract||The acute lethality of low dissolved oxygen (DO) was examined in laboratory studies using several New Zealand freshwater fish and two invertebrates at 15 degree C. The 48-h LC sub(50) value was used as the endpoint for acute DO sensitivity as, owing to rapid mortality, this was found to best approximate the threshold lethal concentration. Median lethal time to death did not provide a reliable endpoint for comparing sensitivities. Fish LC sub(50) values varied from 0.54 to 2.65 mg litre super(-1), with inanga whitebait (Galaxias maculatus; 2.65 plus or minus 0.19 mg litre super(-1), mean plus or minus SEM) being the most sensitive species tested. Common smelt (Retropinna retropinna; 1.83 plus or minus 0.08 mg litre super(-1)) and rainbow trout (Oncorhynchus mykiss; 1.61 plus or minus 0.06 mg litre super(-1)) were similar in their sensitivities, whereas common bully (Gobiomorphus cotidianus; 0.91 plus or minus 0.06 mg litre super(-1)) and shortfin eel elvers (Anguilla australis; 0.54 plus or minus 0.03 mg litre super(-1)) were the most tolerant fish. The shrimp (Paratya curvirostris; 0.82 plus or minus 0.09 mg litre super(-1)) and freshwater crayfish (Koura, Paranephrops planifrons; 0.77 plus or minus 0.06 mg litre super(-1)) were also tolerant to low DO. A subset of experiments to determine the relative sensitivities of larval and juvenile trout and bully indicated no significant differences between these life stages.|
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