Research Institute of Cultivation Resources, Fisheries Research Center, Ehime Research Institute of Agriculture, Forestry and Fisheries, Iyo, Japan.
Graduate School of Integrated Sciences for Life, Hiroshima University, Higashi-Hiroshima, Japan.
J Fish Biol. 2023 Sep;103(3):603-611. doi: 10.1111/jfb.15462. Epub 2023 Jun 21.
Development and growth rate variations during early life are important for understanding the mechanisms of recruitment dynamics. We examined the larval growth rate and age at the onset of metamorphosis (d ) of juvenile Japanese jack mackerel recruited to a population in the Uwa Sea, Japan. Otolith microstructure analyses revealed that the hatch date of juveniles ranged from February to April in 2011-2015, and that their d were 25.5-30.5 days and mean growth rates at the larval stage (G ) were 0.30-0.34 mm day . Among d and G , d showed significant negative correlations with juvenile abundance. Moreover, the hatch date did not coincide with the spawning period of this species in the Uwa Sea, and the hatch date and mean growth rate at the larval stage were comparable to those of Japanese jack mackerel juveniles sampled in the East China Sea (ECS). These findings suggest that most juvenile Japanese jack mackerel originated in other waters, including the ECS, and that larval stage duration influenced their recruitment abundance in the Uwa Sea.
早期生活中的发育和生长速度变化对于了解补充动态的机制很重要。我们研究了在日本海的宇和海种群中补充的幼年日本马鲛鱼的幼虫生长率和变态开始年龄 (d)。耳石微结构分析表明，2011-2015 年间，幼鱼的孵化日期从 2 月到 4 月不等，d 为 25.5-30.5 天，幼虫阶段的平均生长率 (G) 为 0.30-0.34 mm·天 。在 d 和 G 中，d 与幼鱼丰度呈显著负相关。此外，孵化日期与该物种在宇和海的产卵期不一致，并且孵化日期和幼虫阶段的平均生长率与在中国东海（ECS）采样的日本马鲛鱼幼鱼相当。这些发现表明，大多数幼年日本马鲛鱼来自其他水域，包括东海，并且幼虫阶段的持续时间影响了它们在宇和海的补充数量。
