Three-dimensional environmental characteristics of Sardinops melanostictus fishery ground based on in-situ survey data in the Northwestern Pacific
Changes in hydrological and ecological environments are fundamental conditions constraining the formation of Sardinops melanostictus fishing grounds.The three-dimensional environmental variations of the entire middle and upper water column,including the surface layer,are significant factors influencing the migration of these fishing grounds.To gain a deeper understanding of the formation and migration patterns of S.melanostictus fishing grounds,based on three consecutive summers of field survey data from vessel"Songhang",this study used gradient-dependent optimal interpolation methods to integrate historical data,and comprehensively analyzed the physical,oceanographic,and biochemical three-dimensional environmental characteristics of S.melanostictus fishing grounds in the Northwest Pacific.The paper also preliminarily explored the spatiotemporal distribution patterns of the central position of S.melanostictus fishing grounds and their catch in relation to environmental factors such as temperature,salinity,current fields,chlorophyll a,and dissolved oxygen.The results indicated a strong correlation between the central position of S.melanostictus fishing grounds and the radial changes of temperature fronts,as well as the horizontal variation trends of chlorophyll a concentration contours.The fishing grounds were predominantly located in the marginal transition zones of eddy interactions.The suitable ranges for temperature,salinity,and chlorophyll concentration in the fishing grounds were approximately 7-17℃,33.25-34.25,and 0.25-0.75 mg·m-3,respectively.High catch sites exhibited dissolved oxygen saturation greater than 70％,with corresponding current speeds generally ranging between 0.5 m·s-1 and 1.0 m·s-1.There was an inverse relationship between catch and the vertical gradients of environmental factors such as temperature,salinity,chlorophyll concentration,and dissolved oxygen saturation.This study can provide a scientific basis for the forecasting of fishery conditions and resource development in the Northwest Pacific.
three-dimensional environmentformation of fishery groundSardinops melanostictusSonghangin-situ surveyNorthwestern Pacific
万方数据
维普
