Age and growth of the labrid fish Halichoeres poecilopterus in Ago bay, central Japan
Age and growth of the labrid fish Halichoeres poecilopterus in Ago bay, central Japan
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日本中部英虞湾拉布科鱼 Halichoeres poecilopterus 的年龄和生长
DOI：
10.2331/suisan.58.811
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发表时间：
1992
影响因子：
0.4
通讯作者：
K. Mori
中科院分区：
文献类型：
--
作者：
S. Kimura;Yoshinori Nakayama;K. Mori
本报告以1977年7月至1985年8月在日本三重县阿吾湾采集的鱼为研究对象，采用鳞片阅读法，研究了花鳍海猪鱼的年龄和生长与性别类型（初级雄性、雌性和次级雄性）的关系。从躯干腹外侧切除的鳞片最适合年龄测定，其上的环纹清晰可辨。对鳞片边缘增量的检查表明，1月至3月每年形成一次环痕。标准体长（SL，mm）与体重（W，g）的关系可用公式表示：log 10 W=3.15 log 10 SL-5.00。初级雄性和雌雄同体个体（雌性和次级雄性）在每次环形成时的平均反算长度无显著差异。体长和体重的生长曲线为：Lt=211（1-exp（-0.224（t+1.049）; Wt=210（1-exp（-0.224（t+1.049）3.15。雌雄同体个体从雌性到次级雄性的性别转变大多发生在4岁或更大年龄。较大的女性在一定年龄组中有更强的倾向于变成次要男性。
The present report deals with the age and growth of the wrasse Halichoeres poecilopterus (Pisces: Labridae) in relation to sex types (primary male, female, and secondary male) examined by scale reading, based on fish taken from Ago Bay, Mie Prefecture, Japan from July 1977 to August 1985. The scale removed from the ventrolateral portion of the trunk was the most suitable for age determination, and the ring marks on it were clearly distinguishable. Examination of marginal increments of scale showed that the ring marks formed once a year from January to March. The relationship between standard length (SL, mm) and body weight (W, g) was expressed by the formula: log10 W=3.15 log10 SL-5.00. There were no significant differences in the mean back-calculated lengths at the time of each ring formation between primary males and hermaphroditic individuals (females and secondary males). The growth curves for length and weight were de-scribed as follows: Lt=211 (1-exp (-0.224(t+1.049))); Wt=210(1-exp (-0.224(t+1.049)))3.15; where Lt=standard length at age t; Wt=body weight at age t. The sex change from females to secondary males in hermaphroditic individuals took place mostly at age 4 or older. The larger females have a stronger tendency to change to secondary males in a certain age group.