Potamodromous fishes require safe migration routes between spawning, feeding and wintering habitats to complete their life cycle. As knowledge on asp migrations is restricted, this work investigated the movements of adult asp tagged with acoustic transmitters for 3 years in the large Peipsi-Emajõgi-Võrtsjärv lake-river system, Estonia, which is free of migration barriers. Asp showed complex migration patterns, moving between and within different waterbodies (lakes, river, tributaries) in all seasons, but with a tendency to repeat habitat use patterns between years. Lakes were mainly used for feeding during spring and summer (after spawning 65% of the fish migrated to Lake Peipsi), and more so by large fish. The majority (80-96%) of the fish spent the winter in the rivers, mostly close to their subsequent spawning area. Spawning areas were in swift-flowing waters in tributaries and the main river. The results indicate that asp may benefit from an extensive and diverse complex of habitats, and any migration barrier during any season may restrict the natural habitat use by asp. Maintenance and restoration of habitat heterogeneity and connectivity is critical to protect behaviourally diverse fish populations and increase resilience in rivers negatively impacted by various human activities.

中文翻译：

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河湖系统中河豚鱼asp (Leuciscus aspius)的迁徙模式

Potamodromous 鱼类需要在产卵、觅食和越冬栖息地之间的安全迁徙路线，以完成其生命周期。由于对 asp 迁移的了解有限，这项工作在爱沙尼亚大型 Peipsi-Emajõgi-Võrtsjärv 湖河系统中调查了 3 年中用声学发射器标记的成虫的运动，该系统没有迁移障碍。Asp 表现出复杂的迁移模式，在所有季节在不同水体（湖泊、河流、支流）之间和内部移动，但在不同年份之间有重复栖息地利用模式的趋势。湖泊主要在春季和夏季觅食（产卵后 65% 的鱼类迁移到佩皮湖），大型鱼类更是如此。大多数 (80-96%) 的鱼在河流中过冬，大多靠近它们随后的产卵区。产卵区位于支流和主要河流的湍急水域中。结果表明，asp 可能受益于广泛多样的栖息地，任何季节的任何迁移障碍都可能限制asp对自然栖息地的利用。维持和恢复栖息地的异质性和连通性对于保护行为多样的鱼类种群和增加受到各种人类活动负面影响的河流的复原力至关重要。