Age and Growth of Anguilla japonica Leptocephali Collected in Western North Pacific in July 1990.
Age and Growth of Anguilla japonica Leptocephali Collected in Western North Pacific in July 1990.
复制标题
细头鳗鲡的年龄和生长 1990 年 7 月在西北太平洋采集。
DOI：
10.2331/suisan.58.457
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发表时间：
1992
影响因子：
0.4
通讯作者：
T. Ozawa
中科院分区：
文献类型：
--
作者：
K. Tsukamoto;A. Umezawa;T. Ozawa
本文报道了1990年7月在西北太平洋16° 29 ′ N、139° 21 ′ E海域采集的日本鳗鲡（Anguillaponicapletocephali）年龄测定结果。18例19.5-25.4mm TL的小头畸形平均年龄为35.2d。反算出生日期为1990年5月26日至6月12日，平均出生日期为1990年6月2日。这比1986年9月采集的14头40.5-47.0mm TL幼虫的估计出生日早一个月左右。计算出的生长速率为0.59 mm/d，与先前研究中的0.56 mm/d值一致。
Results of age determination of Anguilla japonica leptocephali collected in the Western North Pacific, 16°29'N, 139°21'E in July 1990 are presented. The mean age of 18 leptocephali of 19.5-25.4mm TL was estimated to be 35.2 d. Backcalculated birth dates ranged from 26 May to 12 June 1990, with a mean birth date of 2 June 1990. This value was about one month earlier than the estimated birth dates of 14 larvae of 40.5-47.0mm TL collected in September 1986 in the pre-vious study. A growth rate of 0.59mm/d was calculated and was consistent with the value of 0.56mm/d in the previous study.