The aim of the research was to study toxic effect of lambda-cigalothrin, on quantitative contents of free amino acid in muscle, liver and in brain of fishes in r. Alazani. It was found that under the action of lambda-cigalothrin total amount of free amino acid in fish's tissue was increasing, contents of glycine, asparagine and glutamine acids, alanine and cysteine also increased. Increasing of glutamine and asparagines acids content in muscle and liver of fish goes with the dissimilation of other amino acids through the process of their deaminization by glutamate dehydrogenation system. Increasing the alanine content is indicative of reinforcement of transamination processes. Decrease of phenylalanine, valine, glycine and the other amino acids content is explained by reinforcement of amino acids catabolism in condition of pesticide load, as it occurs in condition of fishes' intoxication by phenols.
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