欢迎访问《渔业研究》官方网站,今天是 分享到:

渔业研究 ›› 2022, Vol. 44 ›› Issue (5): 484-491.DOI: 10.14012/j.cnki.fjsc.2022.05.007

• 论文与报告 • 上一篇    下一篇

饥饿对似鮈早期仔鱼发育、摄食及生长的影响

钟全福,陈斌,樊海平*,林煜, 卓玉琛,张晶晶   

  1. 福建省淡水水产研究所,福建 福州 350002
  • 收稿日期:2022-04-25 修回日期:2022-05-06 出版日期:2022-10-25 发布日期:2022-10-26
  • 通讯作者: 樊海平
  • 作者简介:钟全福(1964-),男,研究员,硕士,从事水产养殖及病害防控技术研究.E-mail:zhongquanfu@126.com
  • 基金资助:
    福建省省属公益类科研院所基本科研专项“似鮈亲本培育用人工繁育技术研究”(2019R1014-1)

Effects of starvation on initial feeding and growth of early Pseudogobio vaillanti larvae

  • Received:2022-04-25 Revised:2022-05-06 Online:2022-10-25 Published:2022-10-26

摘要: 探讨饥饿胁迫对似鮈早期仔鱼开口摄食及生长的影响,确定初次摄食期和饥饿不可逆点(Point of no return,PNR),为其人工育苗提供技术支撑。采用实验生态学方法,观测了饥饿对早期仔鱼卵黄囊吸收、形态、行为、生长、存活及初次摄食率的变化,并确定其PNR和初次投喂最佳时间。结果显示,在水温(25.5±1.2)℃的条件下,似鮈仔鱼4日龄开口摄食,5日龄卵黄消耗殆尽,混合营养期仅1 d,5、6日龄初次摄食率达到峰值(100%),8~9日龄到达PNR,从开口摄食到PNR的时间为4~5 d,50%累计死亡率时间与PNR出现在同一天;在饥饿状态下,体质量在6日龄后出现负增长,而全长在9日龄后出现负增长,相对肥满度不断下降,且极显著低于对照组(P<0.01),可作为判别似鮈饥饿仔鱼的重要依据。结果表明,似鮈属于混合营养期相对较短的鱼类,其仔鱼耐受饥饿的能力较差;在水温(25.5±1.2)℃的条件下,人工繁育似鮈仔鱼可在4日龄开始投喂,初次投喂最佳时间为5日龄,但初次投喂最迟不宜超过7日龄。

关键词: 似鮈, 仔鱼, 饥饿, 初次摄食率, 饥饿不同逆点(PNR), 生长

Abstract: To provide technical support for artificial breeding of Pseudogobio vaillanti, the article explored the effect of starvation stress on the initial feeding and growth, and determined the point of no return (PNR) of early larvae. The changes of absorption of yolk sac, morphology, behavior, growth, survival and initial feeding rate of starved larvae were observed by methods of experimental ecology, and the PNR and optimized initial feeding time were determined. The results showed that under the water temperature of (25.5±1.2)°C, the larvae was started feeding at 4-day-old and the yolk sac was completely absorbed at 5-day-old. A period of mixed nutrition was only maintained 1 day. The initial feeding rate reached 100% at 5-6 days of age. The PNR of starved larvae occurred during 8 days to 9 days of age with the interval between the first feeding to PNR was 4-5 days as the same time of 50% cumulative mortality rate for larvae of P. vaillanti. The total length had negative growth at 9 days of age. At 6 days of age, the body weight of starved group had negative growth and relative fatness decreased continuously, and it was significantly lower than that of control-group, which could be used as judgment basis for the starved larvae of P. vaillanti. The results showed that the larvae of P. vaillanti had short mixed nutrition period and weak starvation tolerance. At water temperature (25.5±1.2)°C, the artificially bred larvae of P. vaillanti could be fed at 4-day-old. The best feeding time as 5-day-old, but the latest feeding time should not exceed 7-day-old.

Key words: Pseudogobio vaillanti, larvae, starvation, initial feeding rate, point of no return(PNR), growth

中图分类号: