Abstract
Size-weight composition and morphology of the nine-spined stickleback Pungitius pungitius from Lake Prilivnoe (southeast of Kamchatka) from December 2022 to March 2023 were studied. The average length of fish in 4 months increased from 30.5 to 55.3 mm, and the average individual weight of fish increased from 0.5 to 2.1 g, respectively. The largest scatter of data was observed for the anteanal, antepectoral, antedorsal and anteventral distances, the length of the caudal peduncle and the length of the head. As body length increases relative to body length, head length, anteanal distance, and antepectoral distance increase. The antedorsal distance, anteventral distance and the length of the caudal peduncle decrease with growth relative to the standard body length. As a result of the research, the variability of the morphological characteristics of the nine-spined stickleback that lives in this reservoir and is caught in one place.
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