西北太平洋鲐鱼渔场的时空分布及其与海表温度和叶绿素浓度的关系

鲐鱼(Scomber japonicus)是西北太平洋的重要捕捞对象，其分布易受环境变化的影响。为定量分析海表温度和叶绿素浓度等影响因子对渔场分布的作用，文章采用产量重心、地统计插值和广义加性模型等方法，结合2017年西北太平洋2艘灯光敷网渔船的渔捞日志和海洋环境数据，探究该海域的渔场分布变化。研究结果表明：鲐鱼产量和单位捕捞努力量渔获量（CPUE）呈先上升后下降的趋势，其中7月的产量最高，9月的CPUE最高；产量重心于4-9月由SW方向向NE方向移动，并于9-12月返回SW方向；鲐鱼渔场的最适海表温度为14℃～16℃，最适叶绿素a浓度为0.4～1.0 mg/m3；叶绿素a浓度对渔场分布无显著影响，可能与鲐鱼摄食对象的特性有关。

Temporal and Spatial Distribution of the Mackerel Fishing Ground in the Northwest Pacific and Its Relationship with Sea Surface Temperature and Chlorophyll Concentration

Scomber japonicus in the Northwest Pacific Ocean is an important fishing target, and its distribution is susceptible to environmental changes. For quantitative analysis of SST and Chlorophyll-a concentration factors effect on the distribution of the fishing grounds, the center of gravity method, geostatistical interpolation, and generalized additive model were used to explore the sea fishery distribution change in the Northwest Pacific Ocean in 2017 by combining the fishing logs of 2 light drip-net fishing vessels and marine environmental data. The results showed that the yield and CPUE of Scomber japonicus increased first and then decreased, with the highest yield in July and the highest CPUE in September. The yield center moved from southwest to northeast from April to September, and returned to southwest from September to December. The optimum SST of Scomber japonicus in fisheries was 14°C~16°C, and the optimum concentration of Chl-a was 0.4~1.0 mg/m3. The concentration of Chl-a had no significant effect on the variation of Scomber japonicus in fishery, which might be related to the characteristics of feeding target.