| 摘要: |
| 对黑鲪Sebastes schlegelii早期发育及摄食进行了研究。结果表明，在水温15.4～16.0 ℃、盐度30～32、pH 8.4的培养条件下，黑鲪初产仔鱼全长为6.07±0.25 mm，腹部有残存的卵黄囊；1日龄仔鱼全长为6.21±0.31 mm，大部分仔鱼进入摄食期，开口饵料为经小球藻强化过的褶皱臂尾轮虫；20日龄仔鱼全长为8.81±0.40 mm，开始增投经营养强化的卤虫无节幼体，仔鱼进入快速生长期。依照TL= aD3 + bD2 cD d方程式，对仔鱼个体的全长与日龄进行回归，得到其生长模型为：TL(mm) =0.009 6D2 -0.041 5D 6.750 3(R2 = 0.987 7)。仔鱼耐受饥饿的时间临界点（PNR）发生在产出后第4天（3日龄），不可逆转饥饿期的时间为2 d。黑鲪仔稚鱼在24h内均有不同程度的摄食。 1日龄仔鱼的摄食高峰出现在8∶00，5日龄仔鱼摄食高峰则出现在16∶00，12日龄仔鱼的摄食强度在12∶00达到最大，相应的摄食率高峰出现在16∶00，19日龄仔鱼在12∶00～0∶00出现摄食率高峰，24日龄稚鱼的摄食强度在12∶00达到最大，30日龄稚鱼的摄食高峰出现在12∶00～16∶00，且16∶00的峰值明显高于12∶00，24h内摄食率达到100%。结果表明，黑鲪仔稚鱼无明显的摄食节律，属于全天摄食型，摄食高峰出现在白天。 |
| 关键词: 黑鲪 早期发育 不可逆转点 摄食节律 |
| DOI： |
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| 基金项目:山东省良种工程课题和泰山学者岗位共同资助 |
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| Study on early development and feeding of larval Sebastes schlegelii |
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| Abstract: |
| The early development and feeding of larval Sebastes schlegelii were studied at water temperature of 15.4～16.0 ℃, salinity 30～32 and pH 8.4. Results showed that the total length of the newly hatched S. schlegelii larvae was 6.07±0.25mm, with the rudimental yolk sac at abdomen. The total length of 1-day old larvae was 6.21±0.31mm, and the larvae started exogenous feeding of rotifers Brachionus plicatilis which were nourished with unicellular algae (Chlorella sp.). The total length of the 20-day-old post-larvae was 8.81±0.40mm, feeding nauplii of brine shrimp Artemia salina. The relationship between increment in total length (TL) and the age in days (D) was described as: TL (mm) =0.009 6D2 -0.041 5D + 6.750 3 (R2 = 0.987 7). In the starvation tests, negative growth of the starved fish was obvious. The 4th day after hatching is the critical time for a 3-day-old larva to resist starving. The period of no return (PNR) from re-gaining food was about two days. 1-day-old larvae got the highest average feeding intensity at 8∶00, while 5-day-old larvae at 16∶00. Following the increase of catching ability, the feeding intensity reached the highest point at 12∶00 for 12-day-old and 19-day-old larvae. 24-day-old post larvae's feeding intensity reached the highest at 12∶0030-day-old post larvae get the highest feeding intensity from 12∶00 to 16∶00, and the peak at 16∶00 is higher than that at 12∶00 obviously. Larvae showed a feeding incidence of 100% in 24 h. Therefore, these results indicated that there was no obvious feeding rhythm in early development stage of S. schlegelii. Feeding rhythms of S. schlegelii larvae belonged to the all-day feeding with feeding peaks occurred at daytime. |
| Key words: Sebastes schlegelii early development point of no return (PNR) feeding rhythm |
