陈淑吟, 张志勇, 许津, 吉红九, 吴国均, 贾超峰, 祝斐, 孟乾. 黑鲷(♀)×真鲷(♂)杂交子二代仔鱼早期发育及饥饿不可逆点[J]. 南方水产科学, 2018, 14(4): 122-128. DOI: 10.3969/j.issn.2095-0780.2018.04.015
引用本文: 陈淑吟, 张志勇, 许津, 吉红九, 吴国均, 贾超峰, 祝斐, 孟乾. 黑鲷(♀)×真鲷(♂)杂交子二代仔鱼早期发育及饥饿不可逆点[J]. 南方水产科学, 2018, 14(4): 122-128. DOI: 10.3969/j.issn.2095-0780.2018.04.015
CHEN Shuyin, ZHANG Zhiyong, XU Jin, JI Hongjiu, WU Guojun, JIA Chaofeng, ZHU Fei, MENG Qian. Study on larval early development and point of no return of hybrid F2 of Acanthopagrus schiegelii (♀)×Pagrus major (♂)[J]. South China Fisheries Science, 2018, 14(4): 122-128. DOI: 10.3969/j.issn.2095-0780.2018.04.015
Citation: CHEN Shuyin, ZHANG Zhiyong, XU Jin, JI Hongjiu, WU Guojun, JIA Chaofeng, ZHU Fei, MENG Qian. Study on larval early development and point of no return of hybrid F2 of Acanthopagrus schiegelii (♀)×Pagrus major (♂)[J]. South China Fisheries Science, 2018, 14(4): 122-128. DOI: 10.3969/j.issn.2095-0780.2018.04.015

黑鲷(♀)×真鲷(♂)杂交子二代仔鱼早期发育及饥饿不可逆点

Study on larval early development and point of no return of hybrid F2 of Acanthopagrus schiegelii (♀)×Pagrus major (♂)

  • 摘要: 以黑鲷(Acanthopagrus schlegelii ♀)×真鲷(Pagrus major ♂)杂交子一代为亲鱼,于2017年4月在水温(21.8±0.4) ℃条件下,对自然受精、人工孵化获得的杂交子二代(F2)早期仔鱼进行发育观察,并就饥饿对仔鱼早期生长与存活的影响及不可逆点(point of no return,PNR)进行研究。结果表明,杂交F2初孵仔鱼全长(2.40±0.15) mm,仔鱼3日龄开口摄食,混合营养期4~5 d,7日龄全长增长到(3.95±0.04) mm,生长态势正常;杂交F2仔鱼开始摄食的初次摄食率及最高摄食率分别为45.8%及77.21%,6日龄时初次摄食率下降为29.83%,抵达PNR时间;饥饿仔鱼5日龄时负生长,全长与对照组有显著差异(P<0.05),6日龄时全长与对照组有极显著差异(P<0.01)。研究表明杂交F2早期仔鱼具有较好的生长态势;其开始投饵的最适时机应于仔鱼开口后的3 d内。

     

    Abstract: With the hybrid F1 Acanthopagrus schiegelii (♀) ×Pagrus major (♂) as parents, we analyzed the early development and point of no return (PNR) of hybrid F2 which were naturally fertilized and artificially incubated at the water temperature of (21.8±0.4) ℃ in April, 2017. The results show that the total length of the newly hatched larva was (2.40±0.15) mm, and the larva started feeding at 3 dah with the mixed feeding stage lasting 4−5 d. The yolk sac disappeared at 7 dah and the total length was (3.95±0.04) mm. The initial feeding rate and the highest feeding rate were 45.80% and 77.21%, respectively. The initial feeding rate dropped significantly to 29.83% at 6 dah and the PNR appeared. In the starvation group, the larvae experienced negative growth and had significant difference at 5 dah (P<0.05) and very significant difference at 5 dah (P<0.01) in the total length with the control group. It is indicated that the development of hybrid F2 larvae was good, and the optimum initial feeding time for the larvae was within 3 d after their mouths opened.

     

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