Emigration is a widespread phenomenon among fish species in seasonal habitats, but little is known about the factors which trigger this behaviour. In controlled experiments using Tilapia guineensis, a species widely occurring in the seasonal floodplains of West Africa, density of fish played a significant role in triggering fish migration, whereas a lack of food available caused an increase in exploratory behaviour but with no impact on successful emigration. The impact of fish density and subsequently interactions between individuals on emigration suggests that this may be an important causal factor of emigration in fish species exhibiting social interactions.

中文翻译：

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引发泛滥平原鱼类迁徙的因素：鱼类密度和食物供应的重要性

迁徙是季节性栖息地鱼类中的普遍现象，但对引发这种行为的因素知之甚少。在使用罗非鱼（一种广泛存在于西非季节性洪泛平原的物种）的对照实验中，鱼类密度在引发鱼类迁徙方面发挥了重要作用，而缺乏可用食物导致探索行为增加，但对成功迁徙没有影响. 鱼类密度和随后个体之间的相互作用对迁徙的影响表明，这可能是表现出社会相互作用的鱼类迁徙的重要原因。