Abstract
Retrospective data on catches of fine-mesh fishes in the Amur collected by Khabarovsk branch of the Pacific Fish. Res. Center (TINRO) since 1937 are analyzed. The main factors influencing on stock and catches of the Amur pike Esox reichertii (Dybowski, 1869) are revealed by methods of multiple regression and variance analyses, as the water level and preceding withdrawal by fishery. Dependence of the pike annual catch on these factors in preceding year (annual landing and the water level in June-September) and in current year (the water level in June) describes about 80 % of the catches variation. The tendency to both stock and landings decreasing since in the late 20 th century is caused by the Amur water regime change. Ways of the stock recovery in conditions of low water level are discussed.
Highlights
Retrospective data on catches of fine-mesh fishes in the Amur collected by Khabarovsk branch of the Pacific Fish
The main factors influencing on stock and catches of the Amur pike Esox reichertii (Dybowski, 1869) are revealed by methods of multiple regression and variance analyses, as the water level and preceding withdrawal by fishery
Dependence of the pike annual catch on these factors in preceding year and in current year describes about 80 % of the catches variation. The tendency to both stock and landings decreasing since in the late 20th century is caused by the Amur water regime change
Summary
Проанализированы архивные данные Хабаровского филиала ТИНРО-центра по вылову частиковых видов рыб в р. С использованием множественного регрессионного и дисперсионного анализа выявлены основные факторы, оказывающие наибольшее влияние на состояние запасов и уловов амурской щуки Esox reichertii. Ostrovskaya E.V. Causes of changing stock of the Amur pike Esox reichertii // Izv. TINRO. Dependence of the pike annual catch on these factors in preceding year (annual landing and the water level in June-September) and in current year (the water level in June) describes about 80 % of the catches variation The tendency to both stock and landings decreasing since in the late 20th century is caused by the Amur water regime change. Цель работы — попытаться выявить основные факторы, влияющие на уловы пресноводных рыб Амура, описать форму и тесноту их связи с уловами на примере одного из самых востребованных объектов частикового промысла — амурской щуки
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