【摘要】 浙江沿岸海域是日本鲐(Scomber japonicus)的重要产卵场。当前针对日本鲐幼鱼生长发育的研究较少,而环境因子会对其生长、分布造成较大影响。根据2019年5月的科学观察员取样数据和环境数据,对其群体组成进行研究,运用Pearson相关性分析、广义加性模型(GAM)探究其分布及个体大小的影响因子,利用克里金插值法定量分析溶解氧对日本鲐幼鱼分布影响。结果表明:海水表层盐度(Sea Surface Salinity,SSS)是影响日本鲐幼鱼分布的主要环境因子,幼鱼集中分布于27.5—27.8盐度海域;浙江沿岸南部海域日本鲐幼鱼叉长、体重均值分别为37.6 mm、0.659 g,中部海域叉长、体重均值分别为64.2 mm、3.305 g,南部、中部海域间鲐幼鱼大小存在显著性差异(P<0.05);日本鲐幼鱼个体大小主要受溶解氧和纬度影响,个体大小与溶解氧呈多波峰的非线性关系,随纬度增加呈先减小再增大趋势。研究表明:溶解氧是影响浙江沿岸日本鲐幼鱼生长、分布的关键环境因子;结合幼鱼分布特征及个体大小差异,推测浙江沿岸海域日本鲐幼鱼来自不同产卵批次。更多还原

【Abstract】 The coastal waters of Zhejiang Province is one of the important spawning grounds for Scomber japonicus.Currently, few studies focus on the growth and development of juvenile S. japonicus, and environmental factors have a great influence on their growth and distribution. Based on scientific observer samplings and environmental data collected in May 2019, we analyzed the distribution and growth status of S. japonicus juvenile off the coast of Zhejiang Province.We studied the population composition, explored the influencing factors of its distribution and body size using the Pearson correlation analysis and generalized additive model, and analyzed the influence of environmental factors on the distribution of mackerel juvenile quantitatively by using Kriging interpolation. The results show that the distribution of juvenile S.japonicus is concentrated in salinity waters of 27.5—27.8, which implies sea surface salinity is the main environmental factor affecting the abundance distribution. There were significant differences in size between the southern and central coastal waters of Zhejiang(P<0.05). The body size of young juvenile was mainly influenced by dissolved oxygen and latitude and had a nonlinear multi-peaks relationship with dissolved oxygen. In detail, the trend of their body size decreased first and then increased with latitude. Combing the distribution characteristics with body size differences, it is concluded that these juvenile S. japonicus may come from different spawning batches.更多还原