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¹ Institute of Marine Biological Research of RAS, 2, Nakhimov ave., 299011, Sevastopol, Russian Federation DOI : 10.4194/1303-2712-v16_1_12 Viewed : 4518 - Downloaded : 3481 In this study, the ecological and biological characteristics of the invasive goby Pomatoschistus bathi on coastal habitats of an area of the Crimean peninsula were investigated. Growth and lenght-weight relationships are characteristic for fish with short life cycles. The minor morphological differences of males from females were identified as a result of the morphometric study. Expansion of the areal and increasing the number of fish was observed in recent years. Large flocks of these fish are concentrated in the shallow water in the spring and autumn months. Fish are actively involved in trophic chains due to their high abundance. Samplings in two common coastal habitats were used to investigate feeding of this species. Pomatoschistus bathi encompasses a broad trophic niche. In this study, a karyotype of this species and its early ontogenetic stages first reported. Keywords : Pomatoschistus bathi, morphology, karyotype, food objects, fertility