The investigation of population structure of abundant species of invertebrata in coastal waters is important for estimation and prediction of life of coastal ecosystems. Population structure of two abundant species of Amphipoda (Echinogammarus karadagiensis Grintsov, 2009 and Echinogammarus foxi (Schellenberg, 1928)) from coastal waters of sand-gravel beach was investigated. Specimens were collected from sand-gravel samples. 50 specimens were collected and analyzed in each sample. Some important elements of population structure (length of specimens, proportion of adult male and female, proportion of adult and juvenile specimens, number of eggs in females) were investigated.
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