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2P Modelling ecotoxic effects (MOP/149) Interspecific differences among fish species exposed to several pesticides. Di Marzio, Walter1, 1 National University of Luján, Luján, Buenos Aires, Argentina ABSTRACT- Ecotoxicity of frequently used pesticides in pampean region was evaluated. Two ictiographic groups of fish were used such as: Characidae (a native family of the Neotropical region) and temperate Poecilidae. One species of these has its southest distribution in Patagonia region. Two species of each Family were used in the experiences. Traditional toxicities index obtained were corrected for size and metabolic rate for each species. Organophosphates, Chlorinated, Pyretroid and herbicides were assayed. Gill Na-K ATPaseAcethylcholinesterase in brain (ACHE) and muscle and total cholinesterase activity were measured. ACHE in brain was correlated with opercular ventilation, on the other hand ATPase activity in gill was related to histological injuries. A matematical modelling was performed to achieve a numerical correlation within Family Characidae, a key group of fish, and the generical Family Poecilidae, more versatile to be used in toxicity test. Key words: pesticides, fish, interspecific differences, ACHE, ATPase |
