Environmental characteristic of walleye pollock fishing ground in high seas of the Okhotsk Sea in summer

Abstract

Abstract: Based on the acoustic survey on the resource of walleye pollock (Theragra chalcogramma) in the high seas of the Okhotsk Sea,the distribution of walleye pollock and the environmental characteristics of its fishing ground were studied,and the relationship between them were analyzed.In August,the high schooling area of walleye pollock was situated in the waters with a depth of less than 500 meters and to the north of 55°N.Walleye pollock mainly distributed in 150～300m depth,and lived in groups.The main food was Euphausia pacifica,and the densely populated area of walleye pollock was roughly consistent with that of Euphausia pacifica.The thermocline was observed at 0～50m depth,the temperature changed at a rate of 0.25℃ per meter,and the cold water mass was roughly located in 50～150m layer.The fish was mainly distributed in the layer below the cold water mass,because of the impeding effect of thermocline and the limiting action of fish food.It seldom inhabited the water below 400m depth,partly because the dissolved oxygen there was rather low.

CHEN Jufa, TANG Qisheng. Environmental characteristic of walleye pollock fishing ground in high seas of the Okhotsk Sea in summer[J]. Chinese Journal of Applied Ecology, 2000, (6): 939-942.

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