Age and growth of Ilisha elongata (Teleostei: Pristigasteridae) in Ariake Sound, Japan:: comparison among populations in western North Pacific Ocean
Age and growth of Ilisha elongata (Teleostei: Pristigasteridae) in Ariake Sound, Japan:: comparison among populations in western North Pacific Ocean
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DOI：
10.1111/j.1444-2906.2007.01425.x
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发表时间：
2007-10-01
影响因子：
1.9
通讯作者：
Takita, Toru
中科院分区：
文献类型：
--
作者：
Zhang, Jie;Takita, Toru
龙鱼在日本和中国都是重要的商业渔业资源。1996年6月至1997年7月，用尺度分析法对日本有明湾海域的白蛉进行了年龄和生长调查。尺度环空一年形成一次，主要在6 ~ 7月间形成。雌雄个体年龄均为1 ~ 6岁。经协方差分析，叉长（FL）对尺度半径(R)的回归在两性间无显著差异。组合性别von Bertalanffy生长方程表示为L-t = 495.4 x (1 - e(-0.3176(t + 0.4108)))，其中L-t为t岁时以mm为单位的FL。北太平洋西部沿海不同种群的年龄和生长比较表明，各年龄段有明鲷种群的FL最小。亚成虫生长的时空变化可能与生长地的环境条件有关；长条草的生长不随纬度的变化而发生梯度变化。水温可能不是影响该物种生长的主要因素。沙捞越热带种群的生长与温带和亚温带种群的生长差异很大，这意味着不同气候带的遗传变异或表型可塑性。
Elongate ilisha Ilisha elongata is a commercially important fishery resource in both Japan and China. Age and growth of the species were investigated by scale analysis from June 1996 to July 1997 in Ariake Sound, Japan. Scale annuli were formed once a year mainly between June and July. The age was 1-6 years for both male and female individuals. There was no significant difference in the regression of fork length (FL) on scale radius (R) between sexes by a covariance analysis. The combined sex von Bertalanffy growth equations were expressed as L-t = 495.4 x (1 - e(-0.3176(t + 0.4108))), where L-t is FL in mm at age t. Comparison of the age and growth among different populations from coastal waters in the western North Pacific Ocean suggested that the FL of the Ariake population is the smallest at each age. The spatio-temporal variations in growth are possibly relevant to environmental conditions of the growth grounds of subadults; however, there was no gradient change in the growth of I. elongata with latitude. Water temperature may not be the main factor affecting the growth of this species. The growth of the tropical population from Sarawak differs greatly from those of temperate and subtemperate populations, which implies genetic variation or phenotypic plasticity in different climate zones.