Journal / Archives
УДК 639.22(265.53) DOI: 10.15853/2072-8212.2017.47.5-45Download the full article
Walleye pollock (Theragra Chalcogramma) fishery in the waters ajaсent to Kamchatka Peninsula in 2003–2015
The work provides analysis of the role of walleye pollock in the World and Russian fishery. Evolution of Russian legislation in the field of fishery regulation in the waters adjacent to Kamchatka Peninsula is reviewed. Characterization of walleye Pollock fishery is made by stocks (North of Sea of Okhotsk, East Kamchatka, West part of the Bering Sea): fishery development history, TAC and catch dynamics, regulation measures, interannual dynamics of catch on fishing gears, walleye pollock portion in catches by different fishing gears, seasonal dynamics of walleye pollock catch on main types of gears, interannual dynamics of efforts number and catches per on unit efforts for the main types of vessel and gears. The period from 2003 to 2015 was used for the research.
УДК 575.174.015.3DOI: 10.15853/2072-8212.2018.48.5-18Download the full article
Differentiation of walleye pollock (Theragra chalcogramma)of the Sea of Okhotsk based on the microsatellite loci
Results of examination of the variety of 10 microsatellite loci (Gmo34, Gmo35, PGmo32, Gmo3, Gmа102, Gmа106, Gmа108, Gmo-G18, Gmo-С83, Gmo-С86) in samples of walleye pollock from the Sea of Okhotsk are represented in the article. It is demonstrated, that the best differentiators in case of walleye pollock in the Sea of Okhotsk are the loci Gmo-C86 and Gma106. A high level of individual genetic variety within examined samples is revealed. The clusters of the samples are of random nature. It has not found correlation between quantitative values of genetic differences of Fst samples and geographic distances between sampling locations. The hypothesis that there are separate populations in spawning districts was not confirmed on results of the research.
УДК 597.562 DOI: 10.15853/2072-8212.2018.49.51-61Download the full article
Некоторые данные о морфологических особенностях мальков наваги (Eleginus gracilis) и минтая (Theragra chalcogramma) у западного побережья Камчатки
Представлены результаты анализа размерной изменчивости морфотипа мальков наваги и минтая. Амплитуда изменчивости отдельных признаков, выраженная коэффициентом вариации, невелика, что свидетельствует об однородности выборок. В процессе роста отмечены существенные преобразования пластических признаков в разных размерных группах. Особи наваги длиной 60–80 мм с высокой сте-пенью достоверности (р ≤ 0,001) отличаются от более мелких рыб (20–40 мм) по 4 из 8 исследованных признаков. Минтай длиной 60–80 мм значимо отличается от рыб длиной 40–60 мм по двум признакам. С увеличением длины и массы тела у мальков наваги и минтая становится относительно короче голо-ва и сокращается диаметр глаза. Проведенное сопоставление показывает, что изменения в морфотипе исследуемых рыб носят сходный характер.
УДК 639.2.053.7 DOI: 10.15853/2072-8212.2019.52.89-107Download the full article
The structure of the Danish seine catches within the PetropavlovskCommander 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.