Abstract—

The study examines changes in the abundance (density) and distribution of European Sprattus sprattus (Linnaeus, 1758) eggs and larvae, as well as the phenology of its spawning depending on hydrologic factors and abundance of gelatinous macroplankton in the Black Sea in November 2016–2017. An increase in temperature of the sea surface layer observed since the beginning of the century and the enhanced heat content of the cold intermediate layer contributed to the preservation of warm-water mesozooplankton at the end of the fall hydrologic season, which provided favorable trophic conditions for all planktophages. The biomass of scyphomedusa Aurelia aurita was the third largest in the gelatinous macroplankton in 2016 and the largest in 2017 for the long-term annual research in fall months. Gelatinous macroplankton, however, did not have a significant impact on the survival of sprat in the early stages of its development. The average number of sprat eggs and larvae in November 2016 (184 and 11 ind/m², respectively) and November 2017 (268 and 21 ind/m², respectively) exceeded their maximum values recorded in the 1950s. The larvae did not differ in length composition in the beginning of the spawning season in 2016 and 2017.

中文翻译：

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2016年11月至2017年，某些非生物和生物因素对欧洲黑鲱鱼（Linnaeus，1758）在黑海产卵的影响

摘要—

这项研究调查了2016年11月，黑水鲱（Linnaeus，1758）卵和幼虫的丰度（密度）和分布的变化，以及其产卵物候的变化，具体取决于水文因素和黑海中胶状浮游植物的丰度。 2017。自本世纪初以来观测到的海表层温度升高，以及冷中间层热量的增加，有助于在秋季水文季节结束时保暖中水浮游生物，为中亚热带提供了有利的营养条件。所有浮游生物。短尾水单胞菌的生物量在2016年秋季是凝胶状浮游生物的第三大产地，而在2017年秋季的长期年度研究中，它是2017年的最大产地。然而，胶状大浮游生物在其发育的早期阶段对鲱鱼的存活率没有显着影响。2016年11月（分别为184和11 ind / m ²）和2017年11月（分别为268和21 ind / m ²）的鲱鱼卵和幼虫的平均数量超过了1950年代记录的最大值。在2016年和2017年产卵季节开始时，幼虫的长度组成没有差异。