Biological features of the gobies mass species in by-catches of passive fishing gears in the Kerch Strait
2019
Milovanov, A.I.
Length-weight composition, sex ratio and age structure of three most abundant species of gobies in by-catch of passive fishing gear in the Kerch Strait: round goby, monkey goby, tubenose goby, are described. The share of these species among total number of the captured gobies varied from 13.9 (monkey goby) to 59.6 % (round goby). Spatial distribution of the studied gobies in this region depends mainly on distribution of bottom habitats, which these goby species prefer. Standard length of the round goby in by-catches of passive gear in the Kerch Strait varied — between 3.5 and 16.4 cm, monkey goby’s length — from 5.5 to 15.1 cm, and tubenose goby’s from 3.7 to 8.1 cm. During the year, the mean length of round goby in passive gear catches decreased. The amount of round goby females in by-catches of passive gear was larger than that of males. Among the captured specimens of monkey goby, males prevailed during the entire research period. The amount of males and females of the tubenose goby was close to equal. In catches of passive gears in the Kerch Strait all age groups of the investigated goby species occurred but the main part of all the studied goby species were specimens at the age of 2–3 years. The obtained data allow to suggest that the populations of the studied goby species are now in a stable condition.
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