THE STRUCTURE OF THE DANISH SEINE CATCHES WITHIN THE PETROPAVLOVSK-COMMANDER COMMERCIAL FISHERY SUBZONE IN 2003–2017

Analysis of annual and seasonal dynamics of major indices and species composition of Danish seine catches within the Petropavlovsk-Commander commercial fishery subzone (Eastern Kamchatka) for the period from 2003 to 2017 was made. The fishing fleet for the period analyzed consisted of 40 mediate, 90 small ships and 125 small boats. The fleet spent respectively 10 606, 34 545 and 24 537 days for fishing and the total catch was 227 000, 466 258 and 200 760 t. Species structure of the catches was similar for all types of vessels. The contribution by species was: walleye pollock — 68.0–70.0%, flounders — 10.7–13.8%, Pacific cod — 8.5–11.2%, greenlings — 2.2–3.8%, sculpins — 4.2–5.3% and the other objects — less than 0.7%. Analysis of the interannual dynamics of the fishery indicated visible reduce of efforts for the small boats only. Substantial increase of the catch per an effort was observed for all types of vessels. In 2003–2005 a huge contribution of flounders, often higher that contribution of walleye pollock, into the catches of all types of vessels was observed. From 2006 walleye pollock became Danish seine fishery dominant species. The mediate and small ships spent minimal efforts in June–September, while small boats demonstrated peak effort volume in these months. In March and December, meantime, when mediate and small ships were maximum active, the commercial fishing activity of the small boats was low.

In April ships of mediate size typically demonstrated the contribution of walleye pollock into the catches decreased , what is a likely effect of banning walleye pollock target fishing by Danish seine within the subzone in mentioned period. In the other months the walleye pollock’s contribution for mentioned type of ships varied from 64.3% to 83.7%. For small ships the walleye pollock’s contribution was the lowest in February–April (57.0–58.8%), for small boats — in February (34.7%). Analysis of the interannual and seasonal dynamics of species structure in the catches by Danish or Far Eastern seines does not provide grounds to reckon Danish seine as more selective in case of walleye pollock, comparing Far Eastern seine version. 

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