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中国农学通报

中国农学通报 ›› 2011, Vol. 27 ›› Issue (32): 61-65.

所属专题： 水产渔业

• 水产 渔业 • 上一篇    下一篇

尼罗罗非鱼不同生长阶段的趋光性研究

杨弘 江苑 肖炜 李大宇 祝璟琳 邹芝英   

  • 收稿日期:2011-05-18 修回日期:2011-06-22 出版日期:2011-12-15 发布日期:2011-12-15

Studies on the phototaxis of Nile tilapia(Oreochromis niloticus) during different growth stages

  • Received:2011-05-18 Revised:2011-06-22 Online:2011-12-15 Published:2011-12-15

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摘要：

采用水平光梯度法，以白光为光源，尼罗罗非鱼为研究对象，研究了5组不同生长阶段尼罗罗非鱼：Ⅰ30.0~45.2mm；Ⅱ51.0~63.3mm；Ⅲ70.0~83.0mm；Ⅳ88.0~102.0mm；Ⅴ108.0~120.0mm，在光梯度分别为250lux、500lux、1000lux、2000lux、4000lux、8000lux下的趋光行为。结果表明：在光强范围250～1000lux条件下，5组尼罗罗非鱼的趋光指数均随着光强的增强而增大，并在光照强度为1000lux时达到最大；在250lux和500lux两个梯度之间趋光指数差异性不显著（P>0.05），但250lux与1000 lux两个梯度之间趋光指数差异性极显著（P<0.01）；当光强大于1000lux时，尼罗罗非鱼的趋光指数随着光强的增强而减小，在2000lux和4000lux两个梯度之间，趋光指数无明显差异（P>0.05），而2000lux与8000lux两个梯度之间趋光指数存在极显著差异（P<0.01)。本实验条件下，Ⅰ组尼罗罗非鱼趋光反应最明显，随着尼罗罗非鱼的生长发育，趋光性逐渐下降，趋光指数Ⅰ＞Ⅱ＞Ⅲ＞Ⅳ＞Ⅴ。在水温23～25℃时，适宜照度区为1000～2000lux，实际生产中可以利用其将尼罗罗非鱼引诱到集中的区域进食，对于提高罗非鱼的摄食率，以及光诱捕具有积极意义。

关键词: 冬油菜, 冬油菜, 新品种, 产量性状, 抗病性状

Abstract:

The photogradient method was used to study the phototactic behaviors of Nile tilapia (Oreochromis niloticus ) during five different growth stages:Ⅰ30.0~45.2mm; Ⅱ51.0~63.3mm; Ⅲ70.0~83.0mm; Ⅳ88.0 ~102.0mm; Ⅴ108.0~120.0mm,which was exposed to the white light at six different lights luminance 250lux、500lux、1000lux、2000lux、4000lux、8000lux. The results showed that the phototactic index(Ip) of five different group Nile tilapia increased with the boosted light intensity which the range was 250lux～1000lux,and the Ip reached the maximum when the light intensity was 1000lux.There was no significant difference in Ip between 250lux and 500lux(P>0.05), but the Ip showed significant difference between 250lux and 1000lux(P<0.01).When the intensity was above 1000lux, the Ip decreased with the increase of light intensity. No significant difference was found in Ip between 2000lux and 4000lux(P>0.05).However, there was significant difference in Ip between 2000lux and 8000lux(P<0.01). In the experimental conditions(water temperature was 23～25℃), the Nile tilapia of I group showed the most obviously phototactic response. The Ip decreased with the growth of Nile tilapia, and the Ip were Ⅰ> Ⅱ> Ⅲ> Ⅳ> Ⅴ. The most preferred light intensity region of tilapia is 1000~2000lux, and it can be used to lure Nile tilapia to the concentrated area, for improving the feeding rate of Nile tilapia and playing an active role in light-purse fishing.