Growth traits of juvenile Japanese jack mackerel (Trachurus japonicus) were estimated based on otolith daily increments in spring during 2011–2016 in the southwestern part of the Sea of Japan (SWSJ). Spatial variability in growth traits was examined between the western and eastern areas of the study area. Back-calculated body length at 50 days post hatch varied among areas and years between 26 and 40 mm. Body lengths at age in the eastern area were significantly smaller than those in the western area. Slower growth rate in the eastern area was associated with the lower ambient temperature in the eastern area than in the western area. In the eastern area, interannual variations in the instantaneous growth rate positively correlated with ambient temperature. Furthermore, interannual variations in back-calculated body length during the late larval and early juvenile stages positively correlated with the juvenile abundance. These results suggest that the thermal conditions in the eastern area are indicative of the growth rate and abundance of juvenile T. japonicus in SWSJ. We further examined relationships between juvenile abundance and thermal conditions during 2003–2019 using archived data of this survey and found that the ambient temperature in the eastern area positively correlated with the juvenile abundance and also the strength of the Tsushima Warm Current. Thus, higher temperatures derived from the Tsushima Warm Current result in a faster growth rate during the late larval and early juvenile stages and subsequently higher abundance of T. japonicus juveniles in SWSJ.

中文翻译：

---

将日本海日本鲭鱼 Trachurus japonicus 的环境驱动因素、幼鱼生长和招募联系起来

鲭鱼（Trachurus japonicus ）幼鱼的生长性状) 是根据 2011 年至 2016 年日本海西南部 (SWSJ) 春季耳石每日增量估算的。检查了研究区西部和东部地区之间生长性状的空间变异性。孵化后 50 天反向计算的体长在 26 到 40 毫米之间的地区和年份之间变化。东部地区的年龄体长明显小于西部地区。东部地区的生长速度较慢与东部地区的环境温度低于西部地区有关。在东部地区，瞬时增长率的年际变化与环境温度呈正相关。此外，在幼虫晚期和幼虫早期，反向计算的体长的年际变化与幼虫丰度呈正相关。这些结果表明，东部地区的热条件表明了幼鱼的生长速度和丰度。SWSJ 中的T. japonicus。我们利用本次调查的存档数据进一步研究了 2003-2019 年间幼鱼丰度与热条件之间的关系，发现东部地区的环境温度与幼鱼丰度和对马暖流强度呈正相关。因此，源自对马暖流的较高温度导致幼虫晚期和幼虫早期的生长速度更快，随后SWSJ中T. japonicus幼虫的丰度更高。