Managing fisheries for species of conservation concern, such as steelhead Oncorhynchus mykiss fisheries in Idaho where wild steelhead are incidentally caught and released, requires a tradeoff between providing opportunity for anglers to fish for hatchery‐origin steelhead and managing conservation risk for wild steelhead. Understanding population‐level effects of catch‐and‐release fishing is critical for effectively balancing this tradeoff. We used an integrated population model to evaluate population‐level effects of incidental catch‐and‐release mortality on steelhead in Idaho and assessed the effectiveness of alternative management strategies for meeting fishery and population objectives. When simulated catch‐and‐release mortality or encounter rates were low, fishery, abundance, and conservation risk objectives were easily met by implementing fisheries annually, regardless of adult abundance. However, when simulated catch‐and‐release mortality rates were high, management strategies that required the population to surpass minimum thresholds for pre‐season abundance were more likely to meet goals for minimizing conservation risk but limited fishing opportunity substantially. Results of this study provide managers with a framework that can be used to manage fisheries to meet fishery goals in the form of hatchery steelhead harvest while maintaining sustainable populations and minimizing risk to wild steelhead. The results also suggest that when implemented properly, it is possible to meet fisheries and conservation objectives simultaneously.

中文翻译：

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附带捕捞和放行的海鱼捕捞管理策略的评估

管理保护性物种的渔业，例如硬头On（Oncorhynchus mykiss）在爱达荷州的捕捞野生wild鱼的渔业中，需要在为垂钓者提供孵化孵化场steel鱼的机会与管理野生conservation鱼的保护风险之间进行权衡。了解捕捞和释放捕鱼对人口的影响对于有效平衡这种权衡至关重要。我们使用综合人口模型评估了爱达荷州硬皮鱼的偶然捕获和释放死亡率对种群的影响，并评估了实现渔业和人口目标的替代管理策略的有效性。当模拟的捕捞和释放死亡率或遭遇率较低时，无论成年丰度如何，每年实施渔业都可以轻松实现渔业，丰度和保护风险目标。然而，当模拟的捕获和释放死亡率很高时，要求种群数量超过季节前丰富度最低阈值的管理策略更有可能达到将保护风险最小化的目标，但实际上限制了捕捞机会。这项研究的结果为管理人员提供了一个框架，可用于管理渔业，以实现孵化场硬头鱼收获的形式实现渔业目标，同时保持可持续种群并最大程度降低野生硬头鱼的风险。结果还表明，如果实施得当，有可能同时实现渔业和养护目标。要求种群数量超过季前丰度最低阈值的管理策略更有可能达到将保护风险降至最低的目标，但实际上大大限制了捕捞机会。这项研究的结果为管理人员提供了一个框架，可用于管理渔业，以实现孵化场硬头鱼收获的形式实现渔业目标，同时保持可持续种群并最大程度降低野生硬头鱼的风险。结果还表明，如果实施得当，有可能同时实现渔业和养护目标。要求种群数量超过季前丰度最低阈值的管理策略更有可能达到将保护风险降至最低的目标，但实际上大大限制了捕捞机会。这项研究的结果为管理人员提供了一个框架，可用于管理渔业，以实现孵化场硬头鱼收获的形式实现渔业目标，同时保持可持续种群并最大程度降低野生硬头鱼的风险。结果还表明，如果实施得当，有可能同时实现渔业和养护目标。