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¹ Institute of Biology of the Southern Seas, National Ukrainian Academy of Sciences, Ichthyology Department, Sevastopol, Ukraine DOI : 10.4194/1303-2712-v14_1_20 Viewed : 4737 - Downloaded : 3751 Age-and sex-dependent characteristics of Mediterranean horse mackerel Trachurus mediterraneus from Sevastopol coastal waters (Black Sea, Ukraine) at the period of 2008-2010 were studied. The alanin- and aspartataminotransferase (ALT and AST) activities in the liver and oligopeptides concentration in blood were measured in male and female at the age of 1-3 years. Significant age-dependent changes were evidenced, while the sex differences were not significant. The results can be applied for development of monitoring management and for perspectives of conservation ecology and biodiversity. Keywords : Horse mackerel, Black Sea, age, sex, size, liver, blood, aminotransferases, oligopeptides