Department of Biological Sciences, Macquarie University, Sydney 2109, Australia.
J Fish Biol. 2009 Jul;74(10):2187-95. doi: 10.1111/j.1095-8649.2009.02240.x.
Captive-reared rainbowfish Melanotonia duboulayi showed no preference for familiar individuals in an experiment examining shoaling preferences. Fortnightly re-examination of the shoaling preferences of the captive-reared population showed that the lack of preference for familiar individuals did not alter over an 8 week period. The same experiment performed on laboratory-reared offspring raised in isolated groups for 8 months since hatching also showed no preference for shoals consisting of familiar individuals. In contrast, trials performed on a wild population of M. duboulayi found a strong preference for familiar shoalmates, a result that is consistent with previous studies. The lack of shoaling preferences in captive-reared populations is probably the result of relaxed selection and inbreeding in the captive environment. The consequences of captive breeding for fish social behaviour are discussed with particular reference to hatchery production.
圈养繁殖的虹彩鱼 Melanotonia duboulayi 在一项研究群居偏好的实验中，对熟悉的个体没有表现出偏好。对圈养繁殖种群的群居偏好进行的每两周一次的重新检查表明，对熟悉个体的缺乏偏好在 8 周内没有改变。在同样的实验中，对在孵化后 8 个月被隔离饲养的实验室繁殖后代进行了实验，结果也显示对由熟悉个体组成的鱼群没有偏好。相比之下，对野生的 M. duboulayi 种群进行的试验发现，它们强烈偏爱熟悉的鱼群同伴，这一结果与之前的研究一致。圈养繁殖种群缺乏群居偏好可能是由于圈养环境中选择和近亲繁殖的放松。本文讨论了圈养繁殖对鱼类社会行为的影响，特别提到了孵化场的生产。
