Hatch date‐dependent differences in early growth and development recorded in the otolith microstructure of Trachurus japonicus
Hatch date‐dependent differences in early growth and development recorded in the otolith microstructure of Trachurus japonicus
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DOI：
10.1111/j.0022-1112.2005.00764.x
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发表时间：
2005-06
影响因子：
2
通讯作者：
S. Xie;Yoshirô Watanabe
中科院分区：
文献类型：
--
作者：
S. Xie;Yoshirô Watanabe
本文对2002年6月至9月在日本南部海域采集的308条长尾鲭鱼幼鱼的耳石结构进行了光镜观察。孵化日期分布表明，产卵季节从2002年1月16日延长至5月30日。第一个次生原基（SP）在19 ~ 54天形成，平均±s.n为30.4±6.1。耳石中SP的数量从2到15不等。平均值为6.1±1.7。第一SP的形成年龄、SP的数量和增量宽度随孵化日期的不同而不同。总体而言，晚孵鱼在第一个SP形成时较早孵鱼更年轻，SP数量和增量均高于早孵鱼。由于增量宽度是体细胞生长的线性函数，而第一个SP的形成与青花鱼的变态有关，这些耳石微观结构的变化表明，相对于早孵的鱼，晚孵的鱼的生长速度（从更大的增量推断）和发育速度（从第一个SP形成的年龄推断）更高。与早期孵化的鱼相比，晚孵化的鱼在生命早期阶段经历的较高温度可能对其更高的生长和发育速度起关键作用。
Otolith microstructure of 308 juvenile jack mackerel Trachurus japonicus sampled in the southern Sea of Japan between June and September 2002 were examined by light microscopy. Hatch-date distribution indicated a protracted spawning season from 16 January to 30 May 2002. The first secondary primordium (SP) was formed at ages 19-54 days, with a mean ± s.n. of 30.4 ± 6.1. The number of SP in an otolith ranged from two to 15. with a mean of 6.1 ± 1.7. Age of the first SP formation, number of SP and increment width varied with hatch date. In general, late-hatched fish were younger when the first SP formed, and had a higher number of SP and wider increments, than early-hatched fish. As increment width is a linear function of somatic growth and formation of the first SP is associated with metamorphosis in jack mackerel, these variations in otolith microstructure indicated that rates of growth (as inferred from wider increments) and development (as inferred by younger age of first SP formation) were higher in late-hatched fish relative to early-hatched fish. Higher temperature experienced by late-hatched fish during early life stages may contribute critically to their higher growth and development rates compared to early-hatched fish.