摘要
为深入了解远东拟沙丁鱼(Sardinops melanostictus)渔场的形成和变迁规律,基于"淞航号"连续3年在渔场区的现场调查数据,通过梯度依赖最优插值方法融合历史数据,综合分析了西北太平洋渔场形成的物理海洋和生物化学三维环境特征,并初步探讨了该海域远东拟沙丁鱼渔场中心位置及渔获量随温度、盐度、流场、叶绿素、溶解氧等环境因子变动的时空分布规律.结果表明,远东拟沙丁鱼渔场中心与温度锋面的径向变化、叶绿素浓度等值线的水平变化趋势均有较好的一致性,且渔场多分布在涡旋相互作用的边缘过渡区.渔场区适宜的温度、盐度、叶绿素范围分别约7～17℃、33.25～34.25、0.25～0.75 mg·m-3,高渔获点的溶解氧饱和度大于70％,对应的流速范围基本在0.5～1.0m·s-1,渔获量与温度、盐度、叶绿素浓度、溶解氧饱和度等环境因子的垂向梯度大致呈反比关系.研究结果可为西北太平洋渔情预报和资源开发提供科学依据.
Abstract
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.
维普
万方数据