"The compact, freshwater migrations" for the general mechanisms of the fish migrations

我们观察到，亲吻泥鳅和其他一些淡水鱼从河流干流迁徙到洪泛区产卵。这些洪泛区是不稳定和短暂的，然而，它们包含了很少的水生捕食者和大量适合胚胎/幼体发育的食物。这项研究提供了第一个证据，证明了产卵迁移是由降雨和随后的水位上升以及新月刺激的。由于在鲑鱼下游的迁徙中也有类似的报道，这些刺激可以作为河流中鱼类迁徙的一般线索。此外，在洪泛区形成后，亲泥螺的产卵受到严格的时空限制。最近，我们成功地证明了水质的变化直接导致了迁徙和产卵行为，这表明一些特殊的气味物质可能是环境的邻近因素。

We have observed that kissing loach and some other freshwater fishes migrate from the main stream of rivers to spawn in flood areas. These flood areas are unstable and ephemeral, however, they contain few aquatic predators and a large amount of food suitable for the development of embryos/juveniles. The present study provides the first evidence that the spawning migration of kissing loach is stimulated by rainfall and the subsequent rise in water level, as well as the new moon. Since similar observations have been reported for downstream migrations of salmonids, these stimuli may serve as general cues for migrations of fishes in rivers. Furthermore, the spawning of kissing loach is rigidly limited spacio-temporally after the formation of flood areas. Recently we have successfully demonstrated that changes in water quality directly induce migration and spawning behavior, suggesting some particular odoriferous substances may be the environmental proximate factors.