水产学报2011，Vol.35Issue(7)：1050-1057,8.DOI:10.3724/SP.J.1231.2011.17400
中国东南沿海日本鳗鲡幼体的日龄及其孵化时间
Daily age and hatching time of Japanese eel elvers from southeast coastal estuaries of China
摘要
Abstract
The Japanese eel, Anguilla japonica, is one of the most important cultured species, widely distributed in rivers of the northeastern Asian countries' Taiwan, China, Korea and Japan. The spawning grounds were recently discovered in the North Equatorial Current west of the Mariana Islands, 15°N,140°E. From January to March 2008, there were 538 Japanese eel elvers collected from nine estuaries along Guangdong Province to Jiangsu Province which were measured on total length and long radius of sagitta otolith. Furthermore, observations were based on growth increments in sagittal otoliths of elvers collected at 9 sites. These results indicated that total length of elvers were 47.40 mm to 62.43 mm,the average value was (54.77 ±2. 21) mm and the mean total length of each site was significantly different (ANOVA, P < 0.001). As for long radius of sagitta otolith,it was from 133. 22 |j,m to 175.95 p,m,the average value was (154.55 ±9. 09) μm and there was no significant difference among each site(ANOVA,P >0. 05). Daily age of elvers ranged from 124 d to 158 d and the average value was(135. 78 ±6. 84) d, indicating that migration of eel larvae from their oceanic spawning ground to the estuary requires 4 to 5 months. An obvious trend of daily age was increasing from southern to northern areas and the maximum difference was 15.9 d. Elver hatching dates, back-calculated from estimated daily ages, indicated that the spawning season lasted 2 months (from Sep. 6 to Oct. 20), mainly concentrated in middle of October and approximately 85. 98% samples accorded with New Moon Hypothesis. Finally,the inverse correlation between daily age and mean daily growth rates of fish length and otolith radius indicated that the time taken on migration from oceanic spawning ground to the estuary was shorter for fast-growing larvae than fast-growing elvers which arrived at the estuary earlier than slow-growing ones.关键词
线鳗/日龄分布/孵化日期/中国东南沿海Key words
elvers/distribution on daily age/ hatching date/ southeast coastal region in China分类
农业科技引用本文复制引用
郭弘艺,魏凯,谢正丽,唐文乔,吴嘉敏,陈文银..中国东南沿海日本鳗鲡幼体的日龄及其孵化时间[J].水产学报,2011,35(7):1050-1057,8.基金项目
国家自然科学基金项目(30771650) （30771650）
上海市科委重点项目(08391910200) （08391910200）
上海市教委E-研究院项目(E03009) （E03009）
上海市重点学科建设项目(S30701) （S30701）
