To evaluate the scientific basis for catch and release as a management tool, a comprehensive 3-year study compared long-term survival of Atlantic salmon that were either angled, radio-tagged and released, or trapped, radio-tagged and released (control). Overall, the mean survival probability of angled salmon relative to the control group was between 0.94 and 0.98. At cool to moderate water temperatures (10–18°C) mean survival of angled salmon was between 0.96 and 0.98. Although the number of salmon caught and released above 21°C was low, catchability was slightly reduced at warm water temperatures (21–25°C) and the mean survival probability was between 0.43 and 0.69. Lastly, the number of fish that survived the spawning period did not differ between the angled group and the control group. However, the mean percentage of fish that overwintered and migrated downstream through a counting fence to sea was between 9% and 10% for those that were caught and released and between 13% and 19% for the control group. Results of this study suggest that mortality of caught and released Atlantic salmon can be delayed but remains low at cool to moderate water temperatures.

中文翻译：

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捕获和释放大西洋鲑鱼的长期生存：垂钓者、科学家和资源管理者的考虑

为了评估将捕捞和放归作为一种管理工具的科学依据，一项为期 3 年的综合研究比较了大西洋鲑鱼的长期存活率，这些鲑鱼要么是倾斜的、无线电标记的和释放的，要么是捕获的、无线电标记的和释放的（对照） . 总体而言，角鲑鱼相对于对照组的平均存活概率在 0.94 和 0.98 之间。在凉爽到中等的水温（10-18°C）下，角鲑的平均存活率在 0.96 到 0.98 之间。尽管在 21°C 以上捕获和释放的鲑鱼数量很少，但在温水温度（21-25°C）下捕获率略有下降，平均存活概率在 0.43 和 0.69 之间。最后，在产卵期存活的鱼的数量在有角度组和对照组之间没有差异。然而，越冬并通过计数栅栏向下游迁移到海中的鱼的平均百分比在捕获和释放的鱼中为 9% 至 10%，而对照组为 13% 至 19%。这项研究的结果表明，捕获和释放的大西洋鲑鱼的死亡率可以延迟，但在凉爽到中等的水温下仍然很低。