Standardization of CPUE for walleye pollock in the Okhotsk Sea with inclusion of some environmental factors
Catch of walleye pollock by Russia is the highest in the northern Okhotsk Sea where on average 0.94 million metric tons were caught annually in the period between 1962 and 2017, or around 24 % of the total yield of Russian fishery. The total stock and spawning stock of pollock grow there since 2002,...
| Main Authors: | , , |
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| Format: | Article |
| Language: | Russian |
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Transactions of the Pacific Research Institute of Fisheries and Oceanography
2020-12-01
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| Series: | Известия ТИНРО |
| Subjects: | |
| Online Access: | https://izvestiya.tinro-center.ru/jour/article/view/589 |
| _version_ | 1797696606996267008 |
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| author | V. V. Kulik A. I. Varkentin O. I. Ilyin |
| author_facet | V. V. Kulik A. I. Varkentin O. I. Ilyin |
| author_sort | V. V. Kulik |
| collection | DOAJ |
| description | Catch of walleye pollock by Russia is the highest in the northern Okhotsk Sea where on average 0.94 million metric tons were caught annually in the period between 1962 and 2017, or around 24 % of the total yield of Russian fishery. The total stock and spawning stock of pollock grow there since 2002, though the catch per unit effort (CPUE) has significantly decreased in the beginning of 2018 despite expected high levels of both total and spawning stocks. The sea surface temperature, ice cover and storms frequency were examined as possible reasons of low fishing efficiency in 2018. For this purpose, the generalized linear models (GLM) and generalized additive models (GAM) of catch dynamics are compared. GAM with addition of temperature and storms factors has the lowest Schwarz’s Bayesian criterion and the highest explained deviance (61.6 %). Efficiency of fishing gears has nonlinear relationship with the towing time. CPUE has hypersensitivity to the stock biomass presented as the power dependence (γ = 0.94, r = 0.923). Standardized CPUE is recommended for using in the final GAM for the pollock stock assessment in the northern Okhotsk Sea, hypersensitivity of CPUE should be estimated and corrected if necessary. |
| first_indexed | 2024-03-12T03:28:50Z |
| format | Article |
| id | doaj.art-55933ee59418437893080ad4655c71ee |
| institution | Directory Open Access Journal |
| issn | 1606-9919 2658-5510 |
| language | Russian |
| last_indexed | 2024-03-12T03:28:50Z |
| publishDate | 2020-12-01 |
| publisher | Transactions of the Pacific Research Institute of Fisheries and Oceanography |
| record_format | Article |
| series | Известия ТИНРО |
| spelling | doaj.art-55933ee59418437893080ad4655c71ee2023-09-03T13:29:21ZrusTransactions of the Pacific Research Institute of Fisheries and OceanographyИзвестия ТИНРО1606-99192658-55102020-12-01200481983610.26428/1606-9919-2020-200-819-836544Standardization of CPUE for walleye pollock in the Okhotsk Sea with inclusion of some environmental factorsV. V. Kulik0A. I. Varkentin1O. I. Ilyin2Тихоокеанский филиал ВНИРО (ТИНРО)Камчатский филиал ВНИРО (КамчатНИРО)Камчатский филиал ВНИРО (КамчатНИРО)Catch of walleye pollock by Russia is the highest in the northern Okhotsk Sea where on average 0.94 million metric tons were caught annually in the period between 1962 and 2017, or around 24 % of the total yield of Russian fishery. The total stock and spawning stock of pollock grow there since 2002, though the catch per unit effort (CPUE) has significantly decreased in the beginning of 2018 despite expected high levels of both total and spawning stocks. The sea surface temperature, ice cover and storms frequency were examined as possible reasons of low fishing efficiency in 2018. For this purpose, the generalized linear models (GLM) and generalized additive models (GAM) of catch dynamics are compared. GAM with addition of temperature and storms factors has the lowest Schwarz’s Bayesian criterion and the highest explained deviance (61.6 %). Efficiency of fishing gears has nonlinear relationship with the towing time. CPUE has hypersensitivity to the stock biomass presented as the power dependence (γ = 0.94, r = 0.923). Standardized CPUE is recommended for using in the final GAM for the pollock stock assessment in the northern Okhotsk Sea, hypersensitivity of CPUE should be estimated and corrected if necessary.https://izvestiya.tinro-center.ru/jour/article/view/589минтайвыловохотское морестандартизациявылов на единицу усилияобобщенные линейные моделиобобщенные аддитивные моделитемпература поверхности моря |
| spellingShingle | V. V. Kulik A. I. Varkentin O. I. Ilyin Standardization of CPUE for walleye pollock in the Okhotsk Sea with inclusion of some environmental factors Известия ТИНРО минтай вылов охотское море стандартизация вылов на единицу усилия обобщенные линейные модели обобщенные аддитивные модели температура поверхности моря |
| title | Standardization of CPUE for walleye pollock in the Okhotsk Sea with inclusion of some environmental factors |
| title_full | Standardization of CPUE for walleye pollock in the Okhotsk Sea with inclusion of some environmental factors |
| title_fullStr | Standardization of CPUE for walleye pollock in the Okhotsk Sea with inclusion of some environmental factors |
| title_full_unstemmed | Standardization of CPUE for walleye pollock in the Okhotsk Sea with inclusion of some environmental factors |
| title_short | Standardization of CPUE for walleye pollock in the Okhotsk Sea with inclusion of some environmental factors |
| title_sort | standardization of cpue for walleye pollock in the okhotsk sea with inclusion of some environmental factors |
| topic | минтай вылов охотское море стандартизация вылов на единицу усилия обобщенные линейные модели обобщенные аддитивные модели температура поверхности моря |
| url | https://izvestiya.tinro-center.ru/jour/article/view/589 |
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