Abstract
Toxicity of sodium nitrite for the spiny-cheek crayfish (Orconectes limosus) was assessed in relation to the concentration of chlorides diluted in water. Results of the tests confirmed a favourable effect of chloride content in water on the tolerance of spiny-cheek crayfish to nitrites. The 96hLC50 value of 4.8 mg l-1 , 17.7 mg l-1 , 34.7 mg l-1 , 50.5 mg l-1 , 74.4 mg l-1 , and 96.6 mg l-1 N-NO2 - found out in individual tests corresponded, respectively to a chloride content of 11, 40, 100, 200, 300 and 400 mg l-1 Cl- in diluting water. Linear relationship of the 96hLC50 values on chloride concentration (y = 0.23 ×+ 7) was proven statistically (R = 0.995).
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