期刊
JOURNAL OF FISH BIOLOGY
卷 77, 期 4, 页码 985-997出版社
WILEY
DOI: 10.1111/j.1095-8649.2010.02740.x
关键词
aggression; Characidae; growth; individual variation; spatial restriction
The growth of sibling dorada Brycon moorei (Characidae) housed individually in small enclosures (0 center dot 25 l; 27 center dot 0 degrees C, range +/- 0 center dot 5 degrees C; 12L:12D) from the egg stage was examined at regular intervals until 36 days after hatching (dah) and compared with their behaviour. From 1 to 8 dah, when cannibalism is intense among B. moorei raised in groups, there was no significant increase of size heterogeneity among isolated fish (c.v. of total length of 3 center dot 1 and 3 center dot 6%, at 1 and 8 dah, respectively) and no primacy of early size differences either. These results suggest that cannibals of B. moorei raised in groups are not natural-born killers with greater growth capacities than others. Size heterogeneity among isolated fish increased significantly first when B. moorei were weaned on formulated feed (8-15 dah), then again from 24 to 36 dah when the average growth rate was half as fast as before (c. 0 center dot 5 v. 1 center dot 0 mm day-1), despite fish consistently feeding. During both periods, there was a significant, positive relationship between individual growth and aggression or boldness. These results suggest that (1) boldness can favour the transition to a new food type and (2) fish exhibited a variable responsiveness to spatial restriction in small enclosures, which may have been alleviated in some individuals by establishment of territorial behaviour, as suggested by their enhanced aggression.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据