Krause Jens
Department of Zoology, University of Cambridge, Downing Street, CB2 3EJ, Cambridge, UK.
Oecologia. 1993 Mar;93(3):356-359. doi: 10.1007/BF00317878.
Feeding rates of mixed shoals of juvenile roach and chub were observed in a shallow stream near Cambridge (UK). Roach at the front of the shoal had significantly higher feeding rates than roach at the back and than chub in either front or back positions. Position in the shoal also had a significant effect on the kind of food consumed, with front roach feeding more on plankton and back roach more on bottom food. Altogether 36 fish from the stream were caught and marked. Half of these were deprived of food and the other half well-fed for 3 days in captivity. After release 36% of them joined their old shoal again. Individuals from the starved group occupied front positions significantly more often than well-fed fish, but after 2 days this difference disappeared.
在英国剑桥附近的一条浅溪中，观察了混合群游的幼体拟鲤和雅罗鱼的摄食率。鱼群前端的拟鲤摄食率明显高于鱼群后端的拟鲤，也高于处于前端或后端位置的雅罗鱼。在鱼群中的位置对所消耗食物的种类也有显著影响，前端的拟鲤更多以浮游生物为食，后端的拟鲤更多以水底食物为食。总共从这条溪流中捕获并标记了36条鱼。其中一半被禁食，另一半在圈养中喂养3天。放归后，36%的鱼又加入了原来的鱼群。饥饿组的个体比喂食良好的鱼更频繁地占据前端位置，但2天后这种差异消失了。
