The point of no return and pectoral angle of Japanese anchovy (Engraulis japonicus) larvae during growth and starvation
文献类型: 外文期刊
第一作者: Wan Ruijing
作者: Wan Ruijing;Li Xiansen;Zhuang Zhimeng;Johannessen, Arne
作者机构:
关键词: Engraulis japonicus;larvae;starvation;point of no return (PNR);pectoral angle
期刊名称:ACTA OCEANOLOGICA SINICA ( 影响因子:1.431; 五年影响因子:1.445 )
ISSN: 0253-505X
年卷期: 2007 年 26 卷 5 期
页码:
收录情况: SCI
摘要: At a temperature of 23.0 similar to 24.8 degrees C, the mixed feeding of Japanese anchovy larvae was initiated 24 h before the yolk-sac was exhausted. The point of no return (PNR) was reached on the 6th day after hatching. On the 4th day after hatching, the pectoral angle appeared in both fed and unfed anchovy larvae although it was more evident and sharper in the starved and the PNR stage larvae than in the fed ones. According to observations of larvae collected in the sea, the pectoral angles were evident not only in the larvae of 3.62 similar to 7.44 mm in standard length, but also in the larvae of 2.70 mm in standard length with remnants of yolk. The pectoral angles became diffuse when the larvae reached 7.84 mm and vanished at 9.86 mm. The pectoral angle cannot be used as a criterion to distinguish healthy from starving larvae.
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