Some Haematological and Physiological Indices Modifications on Fish under the Action of Chemical Pollutants

Pollution represents one of the main causes inducing modifications of the structures and physical functions of the aquatic ecosystems. The toxic substances harmful action works upon the living material, first at the individual level, and then, like a chain reaction, at the other levels: species and biocoenosis. The toxicity of a chemical substance varies very much from a species to another and even from an organism group to another. From our experiments, one has noticed that copper sulphate has an inhibitory effect on the oxygen consumption at all observed fish. Realizing the survival curves, one has realized that the toxicity of the copper sulphate grows with the concentration, being stronger at bigger fish. The red cells number is smaller, both in the copper sulphate case and the rest of the used fungicides (Champion and Funguran contain copper hydroxide, Ridomil and Curzat contain copper oxychloride). The red cells low number determines the low oxygen consumption. The experiments show the fact that the used substances are insignificantly toxic for the fish.