Feeding rhythm and growth of the tongue sole, Cynoglossus semilaevis Gunther, during its early life stages

文献类型： 外文期刊

第一作者： Ma, AJ

作者： Ma, AJ;Liu, XZ;Xu, YJ;Liang, Y;Zhuang, ZM

作者机构：

关键词： tongue sole;Cynoglossus semilaevis Gunther;feeding rhythm;growth;early life stages

期刊名称：AQUACULTURE RESEARCH （ 影响因子：2.082； 五年影响因子：2.415 ）

ISSN： 1355-557X

年卷期： 2006 年 37 卷 6 期

页码：

收录情况： SCI

摘要： The feeding rhythm and growth characteristics of the early life stages of the tongue sole, Cynoglossus semilaevis Gunther, were studied. Larvae began to prey on rotifers about 2-3 days after hatching at 23 degrees C. About 12 days after hatching, larvae had grown to 8-9 mm in total length and were able to prey on Artemia larvae. As the larvae grew, they showed an increasing feeding capacity and a distinct feeding rhythm. Feeding intensity for day-6 larvae was highest at 12:00 and 18:00 hours, about 2-3 h after the maximum feeding incidence. The highest levels of feeding intensity for day-16 larvae occurred between 09:00 and 18:00 hours. By day 26, when the larvae had metamorphosed, feeding capacity had again increased considerably and, in contrast to the earlier stages, feeding intensity peaked at 18:00 and 24:00 hours concurrently with feeding incidence. Thus, tongue sole were found to have different feeding rhythms in the pre- and post-metamorphosis stages, with the highest feeding activity in the daytime during the larval planktonic stage, and at night during the juvenile benthic stage. The estimated maximum daily feeding rates were 65%, 40% and 11% of body weight on days 6, 16 (larvae) and 26 (juveniles) respectively. Size variation increased markedly with development.

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