Abstract

Passive downstream migration of juvenile fish associated with the invasive water hyacinth (Eichhornia crassipes) was investigated in the delta of the Mekong River. The behavioral program of juveniles aimed at leaving the coastal attached vegetation and entering the transit flow for migration was the same in the case with drifting water hyacinth. In general, the passive downstream migration has three components: the drifting of juveniles with thickets of water hyacinth; the entry of juveniles into the transit flow from coastal biotopes during the twilight-nocturnal period; the entry of juveniles into the transit flow from thickets of drifting hyacinth during the twilight-nocturnal period. It should be noted that downstream migrations of juvenile fish associated with drifting water hyacinth in the Mekong Delta may end by their mass death in salt water after reaching the sea with floating hyacinth.

中文翻译：

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与水葫芦（Eichhornia crassipes）漂移相关的幼鱼向下游迁移

摘要

与侵入水葫芦相关幼鱼被动下游迁移（凤眼莲）在湄公河三角洲进行了调查。在漂移的风信子的情况下，旨在离开沿海附着的植被并进入过境流进行迁移的少年的行为程序是相同的。通常，被动的下游迁徙具有三个组成部分：带有水葫芦灌木丛的幼鱼的漂流；暮光之夜期间，少年进入沿海生物群落的过境流；在暮光夜行期间，幼虫从风信子灌木丛进入过渡流。应当指出，与湄公河三角洲漂流的水葫芦相关的幼鱼向下游的迁移可能会随着它们的浮动风信子进入海水而在海水中大量死亡而结束。