Оценка нерестовых возвратов нерки оз. Курильского (западная Камчатка) по материалам траловых учетов ее молоди в Охотском море

• Main Author: Ерохин, В.
• Format: Text
• Language: unknown
• Published: Федеральное государственное унитарное предприятие «Тихоокеанский научно-исследовательский рыбохозяйственный центр» 2006
• Subjects: Okhotsk; Sockeye; okhotsk sea; КАМЧАТК*
• Online Access: http://cyberleninka.ru/article/n/otsenka-nerestovyh-vozvratov-nerki-oz-kurilskogo-zapadnaya-kamchatka-po-materialam-tralovyh-uchetov-ee-molodi-v-ohotskom-more; http://cyberleninka.ru/article_covers/510981.png

Определены места нагула молоди нерки в Охотском море, пути и сроки миграций, оценена ее численность в разные годы. Показана возможность прогнозирования нерестовых подходов нерки оз. Курильского по результатам тралового учета ее молоди в море. В ретроспективном прогнозе для 11 из 17 лет отклонения прогностических величин от факта не вышли за пределы 25 %-ного диапазона. Описаны элементы методики оценки численности возвратов нерки. The data on sockeye salmon juveniles number in the Okhotsk Sea were obtained from trawl surveys conducted by KamchatNIRO in September-October of 19822003 and commercial seine catches in August-September of 1984. In the trawl surveys, the main fishing gear was the pelagic rope trawl 54.4/192 m with vertical opening of 2530 m and horizontal opening of 40 m. The data of the salmon juveniles catches were applied for forecasting of the sockeye salmon returns to Kurilskoye Lake for spawning. Besides, some biological parameters of the sockeye salmon are described, as much as they were used for the forecasting. The method of the sockeye salmon returns forecasting includes the following steps: 1) to estimate the main age groups abundance during the autumn feeding migrations of juveniles; 2) to calculate the fish ready for spawning in a forecasted year, with taking into account its withdraw by catch; 3) to determine correlation between age groups spawning in the forecasted year; 4) to estimate survival of certain age groups in the sea and to correct the number of the spawners taking into account the survival of the main age groups. By compare the factual and forecasted retrospectively rates of returns, the method of forecasting was recognized as satisfactory. In the retrospective forecasts, in 11 out of 17 cases the deviations of forecasting rates from factual rates didn't exceed 25 %. The forecasting based on the data on juveniles obtained in previous year had minimal deviations.