Information on the movement patterns of fishes is essential for managers that are making critical resource decisions. We examined the frequency of a keystone species, Chinook Salmon Oncorhynchus tshawytscha that migrated from different marine basins to the Nisqually River estuary, which lies within the southernmost marine basin (hereafter, “South basin”) in Puget Sound (Washington, USA). Hatchery‐reared juvenile fish were sampled by using beach seine, lampara seine, and fyke nets to determine seasonal trends in frequency, habitat use, and the influence of different capture methods. The captured fish originated from three marine basins, nine Puget Sound rivers, and fourteen hatcheries. The data revealed a consistent pattern showing that most of the tagged fish (72%) were from the nearby Nisqually River (in the South basin), but fish from more northerly marine basins (hereafter, “Outbasin”) were also common. Although the majority of the tagged fish (99%) that were captured during April and May were originally released into rivers adjacent to the South basin, 90% of the fish that were captured in August and September had originated from rivers adjacent to Outbasin locations (up to 130 km distant). A comparison of sampling methods showed that the beach seine produced 27% Outbasin fish compared with 53% that were obtained with the lampara seine. The analysis of habitat use suggested that during June and July, more Outbasin fish (>40%) were captured in delta flats and nearshore habitats than in estuarine emergent marsh habitat (26%). Release location (river basin), but not distance, appeared to be an important factor that influenced the percentage of Outbasin fish that were captured in the South basin. However, it appeared that the fish that were released at light weights and early dates were more likely to be captured. Information on the movement of juvenile salmon to a nonnatal marine basin may help to increase our understanding of features of life history and survival, and it has application elsewhere, as many marine species are artificially propagated, released in large numbers, and have the potential to use nonnatal habitats.

中文翻译：

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少年孵化场奇努克鲑鱼非季节性海洋盆地的季节性使用

有关鱼类运动方式的信息对于做出关键资源决策的管理者至关重要。我们检查了一种关键物种奇努克鲑鱼Oncorhynchus tshawytscha的频率它们从不同的海洋盆地迁移到位于美国华盛顿州普吉特海湾最南端的海洋盆地（以下称“南部盆地”）内的尼斯奎利河河口。通过使用海滩围网，兰帕拉围网和鱼网对孵化场饲养的幼鱼进行采样，以确定频率，栖息地使用以及不同捕获方法的影响的季节性趋势。捕获的鱼来自三个海洋盆地，九个普吉特海湾河流和十四个孵化场。数据显示出一致的模式，表明大多数带标签的鱼（72％）来自附近的尼斯夸利河（位于南流域），但来自更北端的海洋流域（以下称“流域”）的鱼也很常见。尽管4月和5月捕获的大多数带标签鱼（99％）最初被释放到南部盆地附近的河流中，但8月和9月捕获的90％的鱼起源于Outbasin位置附近的河流（远达130公里）。抽样方法的比较表明，沙滩围网生产了27％的Outbasin鱼，而兰帕拉围网生产的则为53％。对栖息地使用情况的分析表明，在六月和七月期间，三角洲的平地和近岸栖息地中捕获的Outbasin鱼（> 40％）比河口紧急沼泽栖息地（26％）要多。释放位置（河流盆地）而不是距离似乎是影响在南部盆地捕获的Outbasin鱼所占百分比的重要因素。然而，看来，较轻和较早释放的鱼更容易被捕获。关于幼鲑向非新生海洋盆地运动的信息可能有助于增进我们对生活史和生存特征的了解，并且该信息已在其他地方得到应用，因​​为许多海洋物种是人工繁殖，大量释放的，并有可能使用非新生儿栖息地。