Hagihara S, Aoyama J, Limbong D, Tsukamoto K
College of Bioresource Sciences, Nihon University, 1866 Kameino, Fujisawa, Kanagawa, 255-0880, Japan.
International Coastal Research Center, Atmosphere and Ocean Research Institute, The University of Tokyo, 2-106-1 Akahama, Otsuchi, Iwate, 028-1102, Japan.
J Fish Biol. 2018 May;92(5):1526-1544. doi: 10.1111/jfb.13608. Epub 2018 Apr 6.
The age and growth of migrating tropical eels, Anguilla celebesensis and Anguilla marmorata from central Sulawesi, Indonesia, were examined. Migrating eels (63 A. celebesensis and 38 A. marmorata) were obtained from weirs near the Poso Lake outlet and non-migrating eels (35 A. celebesensis and 119 A. marmorata) were captured by baited hooks, eel pots, scoop net and electro-fishing in the Poso River system, Laa River system, Baluga River, Tongku River and Padapu River from February 2009 to October 2010. In both species, the proportion of eels with opaque otolith edges showed a single peak in July, suggesting that one annulus (a pair of translucent and opaque zones) was formed each year in their otoliths. Mean ± s.d. and range of total length (L ) and age was 785·2 ± 114·9 (585-1083) mm and 7·5 ± 1·6 (5-11) years in migrating female A. celebesensis and 1132·2 ± 173·7 (800-1630) mm and 11·6 ± 3·3 (7-23) years in A. marmorata. The age of migrating female eels was negatively correlated with annual growth rate, 100·7 ± 17·2 (68·1-145·0) mm year in A. celebesensis and 97·9 ± 19·3 (66·6-131·6) mm year in A. marmorata, but there was no significant correlation between the L and annual growth rate in either species. The annual growth rates of these female tropical eels were typically higher than those of temperate anguillid species, suggesting a latitudinal cline in growth rate in the genus Anguilla reflecting the environmental conditions of their growth habitat.
对来自印度尼西亚中苏拉威西省的塞内加尔鳗鲡（Anguilla celebesensis）和云纹鳗鲡（Anguilla marmorata）这两种洄游热带鳗鲡的年龄和生长情况进行了研究。洄游鳗鲡（63条塞内加尔鳗鲡和38条云纹鳗鲡）采自波索湖出水口附近的拦河堰，非洄游鳗鲡（35条塞内加尔鳗鲡和119条云纹鳗鲡）于2009年2月至2010年10月期间，通过在波索河水系、拉阿河水系、巴卢加河、通库河和帕达普河中用带饵鱼钩、鳝笼、抄网和电捕鱼的方式捕获。在这两个物种中，耳石边缘不透明的鳗鲡比例在7月出现单峰，这表明它们的耳石每年形成一个年轮（一对半透明和不透明带）。洄游的雌性塞内加尔鳗鲡的全长（L）均值±标准差及范围为785.2±114.9（585 - 1083）毫米，年龄为7.5±1.6（5 - 11）年；云纹鳗鲡的全长均值±标准差及范围为1132.2±173.7（800 - 1630）毫米，年龄为11.6±3.3（7 - 23）年。洄游雌性鳗鲡的年龄与年生长率呈负相关，塞内加尔鳗鲡的年生长率为100.7±17.2（68.1 - 145.0）毫米/年，云纹鳗鲡的年生长率为97.9±19.3（66.6 - 131.6）毫米/年，但在这两个物种中，全长与年生长率之间均无显著相关性。这些雌性热带鳗鲡的年生长率通常高于温带鳗鲡物种，这表明鳗鲡属的生长率存在纬度梯度变化，反映了其生长栖息地的环境条件。
