Asymptotic growth trajectories of larval sardine (Sardinops melanostictus ) in the coastal waters off western Japan
Asymptotic growth trajectories of larval sardine (Sardinops melanostictus ) in the coastal waters off western Japan
复制标题
日本西部沿海水域沙丁鱼幼虫（Sardinops melanostictus）的渐近生长轨迹
DOI：
10.1007/s002270050023
复制
发表时间：
1997
期刊：
影响因子：
2.4
通讯作者：
T. Kuroki
中科院分区：
文献类型：
--
作者：
Yoshirô Watanabe;T. Kuroki
根据个别确定的耳石日环半径和鱼的总长度之间的异速生长关系，从第一个喂养阶段到捕获日期（约20至35 mm的总长度; TL）的日本沙丁鱼，黑腹沙丁鱼，在日本西部沿海沃茨捕获的个别幼虫的生长轨迹进行反算。1月、2月和3月孵化的幼虫在沿海水域的生长速度比在黑潮近海海域的沃茨幼虫更快、更均匀。黑潮近海海域的沃茨幼虫在1月、2月和3月孵化的幼虫在沿海水域的生长速度比在黑潮近海海域的沃茨幼虫更快、更均匀。三个孵化月队列的生长轨迹相似，可以用Gompertz模型表示。生长曲线的拐点出现在孵化后9 ~ 11 d，此时仔鱼体长为10.8 ~ 11.8 mm。这些点的最大生长速率为0.80至0.85 mm d-1。生长速率逐渐下降后的拐点，和幼虫TL收敛到无限长的29至32毫米，在该尺寸从幼虫到少年开始变态。这种渐近生长模式在幼虫阶段的TL的范围狭窄，尽管在沿海沃茨渔船捕获的幼虫的年龄范围很广。缓慢的增长，因此长时间的变态阶段可能是有影响力的，在确定的累积总死亡率在日本沙丁鱼的早期生命阶段。
Growth trajectories of individual larvae of Japanese sardine,Sardinops melanostictus, caught in the coastal waters off western Japan were back-calculated from the first feeding stage up to date of capture (approximate size of 20 to 35 mm total length; TL) based on individually determined allometric relationships between otolith daily ring radii and fish total lengths. The larvae in January-, February-, and March-hatched cohorts in the coastal waters grew faster and more uniformly than those in the oceanic waters offshore of the Kuroshio current. Growth trajectories of the three hatch-month cohorts were similar and could be expressed by the Gompertz model. The inflection points of the growth curves were reached at 9 to 11 d after hatching, when larvae were 10.8 to 11.8 mm TL. Maximum growth rates at these points were 0.80 to 0.85 mm d−1. Growth rates gradually declined after the inflection points, and larval TLs converged into the infinite length of 29 to 32 mm, the sizes at which metamorphosis from larvae to juveniles is initiated. This asymptotic growth pattern in the larval stage resulted in the narrow ranges in TLs in spite of the wide range of ages of the larvae caught by boat seiners in the coastal waters. Slow growth and therefore long duration of the metamorphosing stage could be influential in determining the cumulative total mortality in the early life stages of the Japanese sardine.