Abstract
Biology and seasonal (from May to November) population dynamics of big-head Far East goby Gymnogobius urotaenia from the Kolkhoznaya channel is analyzed (the estuary part of the Serebryanka River). This species attains length 145 mm, weight 23.9 g, and age 5+. Males live one year longer than females. In both sexes, the highest growth rate is observed in the first and second years of life, and that of weight growth is observed in the third and fourth years. It spawns from the end of May until the end of June. The absolute fecundity does not exceed 4000 eggs. The base of the diet consists of mysids. This is an abundant species. The annual life cycle of G. urotaenia comprises spawning migration, spawning, embryonic development, pelagic larval stage, the phase of transition to bottom mode of life, feeding, and wintering migration.
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