Особенности нереста, распределение и оценка запасов минтая в водах южных Курильских островов в 2006 г.

• Main Authors: Овсянникова, Светлана, Авдеев, Геннадий, Овсянников, Евгений, Жигалов, Игорь
• Format: Text
• Language: unknown
• Published: Федеральное государственное унитарное предприятие «Тихоокеанский научно-исследовательский рыбохозяйственный центр» 2008
• Subjects: ЮЖНО-КУРИЛЬСКИЙ РАЙОН; ЗАЛ. ПРОСТОР; КУНАШИРСКИЙ ПРОЛИВ; ТИХООКЕАНСКИЕ ВОДЫ; МИНТАЙ; НЕРЕСТ; ИКРА; НЕРЕСТОВЫЙ ЗАПАС; РАЗМЕРНО-ВОЗРАСТНОЙ СОСТАВ; Kuril Strait; Okhotsk; Pacific; okhotsk sea
• Online Access: http://cyberleninka.ru/article/n/osobennosti-neresta-raspredelenie-i-otsenka-zapasov-mintaya-v-vodah-yuzhnyh-kurilskih-ostrovov-v-2006-g; http://cyberleninka.ru/article_covers/8392075.png

Приводятся новые данные о состоянии запасов, распределении икры и размерно-возрастных групп минтая у южных Курильских островов, полученные при проведении ихтиопланктонной и траловой съемок в весенний период 2006 г. Ранее наиболее полная съемка в этом районе была проведена в 1991 г., поэтому данные этих лет рассматриваются в сравнительном плане. Также подробно рассматриваются особенности нереста минтая и распределение производителей на различных этапах созревания. Ichthyoplankton and trawl survey was conducted off the southern Kuril Islands in spring 2006, which included both Okhotsk and Pacific sides of the islands accessible in relatively easy ice conditions. The data are compared with the results of similar survey in 1991. The densest concentrations of the pollock eggs and spawning fish were found in the Kunashir Strait and the Prostor Bay. Besides, the eggs congestions were in the Pacific waters, too: in the South-Kuril Strait, off the Minor Kuril Ridge, and northeastward from the Iturup Island, but in these areas the spawning pollock was almost not observed in trawl catches, and eggs concentrations were lower significantly. There is concluded that pollock did not spawn in the Pacific waters of the southern Kuril Islands in March, both in 1991 and 2006. According to oceanographic data, and also the eggs and mature fish distribution and terms of their spawning, the pollock eggs drifted from the Prostor Bay to the Pacific through the Friz Strait and from the Kunashir Strait to the Pacific side of the Minor Kuril Ridge through the South-Kuril Strait. By the end of March in both years, the spawning was practically completed in the Kunashir Strait, but still began in the Prostor Bay. That's why mature pollock with age >6+ concentrated in the Prostor Bay mainly. Immature fish (13 years old) distributed in the Pacific waters off the Iturup Island, and recruits (46 years old) moved gradually from the Pacific to the Okhotsk Sea. After the spawning, the pollock went away from the Kunashir Strait, therefore its stock there was much lower than in the Prostor Bay. The pollock biomass in 1991/2006 was estimated in 7.1/2.3 th. t in the Kunashir Strait and in 35.6/18.9 th. t in the Prostor Bay. Total abundance of pollock in the Pacific waters of the southern Kuril Islands was estimated as 12.4 bln. spec. and 368.9 th. t that is the highest level for the last 15 years. The core of this stock (12.2 bln. spec.) was formed by the strong generation of the year 2005.