Department of Environmental Science and Policy, University of California, Davis, One Shields Avenue, Davis, CA 95616, USA.
J Fish Biol. 2009 Oct;75(6):1410-26. doi: 10.1111/j.1095-8649.2009.02372.x.
Behavioural assays were conducted on newly emerged steelhead Oncorhynchus mykiss to investigate the presence of behavioural syndromes and to determine whether behavioural type in young fish predicts growth rate in a conventional hatchery rearing environment. Individual fry were consistent in their position choice and activity behaviours across safe and unsafe contexts, as well as among assays conducted on different days. Position choice and activity behaviours, however, were not necessarily correlated to each other. Both behaviours predicted feeding rates during behavioural assays, but there was no relationship between fry behaviour and subsequent growth rate or survival during the first 3 months of hatchery rearing. These results support the hypothesis that selection in captivity may be relaxed with respect to behavioural type rather than directional, allowing for increased behavioural variance in domesticated populations. Modest magnitudes of correlations among fry behaviours, however, suggest that behavioural type may be unstable at the onset of the juvenile feeding stage.
对新孵化的虹鳟 Oncorhynchus mykiss 进行行为分析，以研究行为综合征的存在，并确定幼鱼的行为类型是否可以预测传统孵化养殖环境中的生长速度。个体鱼苗在安全和不安全环境以及不同天进行的测试中，在位置选择和活动行为上保持一致。然而，位置选择和活动行为不一定相互关联。这两种行为都可以预测行为测试期间的摄食率，但鱼苗行为与随后的生长速度或在孵化养殖的头 3 个月的存活率之间没有关系。这些结果支持了这样的假设，即在圈养中，相对于方向性选择，行为类型的选择可能会放宽，从而允许驯化种群中行为变异增加。然而，鱼苗行为之间适度的相关性表明，行为类型在幼鱼摄食阶段开始时可能不稳定。
