Artificial spawning habitat has been used to mitigate for lost habitat and to increase the abundance of salmonids, but the endurance and potential need of maintenance of these habitat improvements have not been well studied. We studied the movement of gravel, attributed to spawning activity of brown trout in a third-order stream in northern Sweden by deploying PIT-tagged grains of gravel on artificially constructed gravel patches. The results suggest that gravel movement was substantial and most prevalent at the central parts of the patches. As 76% of the tagged gravel was mobilized during a single spawning season, maintenance of this habitat improvement may be necessary in order to guarantee its functionality over time. This study provides a first step in guiding managers tasked with identifying factors degrading restored spawning habitat and maintenance needed.

中文翻译：

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褐鳟鱼 (Salmo trutta L.) 会移动河床基质吗？——对人工产卵栖息地的耐久性和维护的影响

人工产卵栖息地已被用于减轻栖息地的丧失并增加鲑鱼的数量，但尚未对维持这些栖息地改善的持久性和潜在需求进行深入研究。我们通过在人工建造的砾石斑块上部署带有 PIT 标记的砾石颗粒，研究了砾石的运动，这归因于瑞典北部三阶溪流中褐鳟的产卵活动。结果表明，砾石运动在斑块的中心部分是大量的并且最普遍。由于 76% 的标记砾石在单个产卵季节被动员，因此可能需要维护这种栖息地改善，以保证其功能随着时间的推移。