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Estimation of discard mortality of sablefish (Anoplopoma fimbria) in Alaska longline fisheries

机译:估计阿拉斯加延绳钓渔业中的黑貂(Anoplopoma fimbria)丢弃物死亡率

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Sablefish (Anoplopoma fimbria) are often caught incidentally in longline fisheries and discarded, but the extent of mortality after release is unknown, which creates uncertainty for estimates of total mortality. We analyzed data from 10,427 fish that were tagged in research surveys and recovered in surveys and commercial fisheries up to 19 years later and found a decrease in recapture rates for fish originally captured at shallower depths (210-319 m) during the study, sustaining severe hooking injuries, and sustaining amphipod predation injuries. The overall estimated discard mortality rate was 11.71%. This estimate is based on an assumed survival rate of 96.5% for fish with minor hooking injuries and the observed recapture rates for sablefish at each level of severity of hook injury. This estimate may be lower than what actually occurs in commercial fisheries because fish are likely not handled as carefully as those in our study. Comparing our results with data on the relative occurrence of the severity of hooking injuries in longline fisheries may lead to more accurate accounting of total mortality attributable to fishing and to improved management of this species.
机译:紫fish(Anoplopoma fimbria)通常在延绳钓渔业中偶然捕获并丢弃,但释放后的死亡率尚不明确,这给估算总死亡率带来了不确定性。我们分析了研究调查中标记的10,427条鱼的数据,直到19年后才在调查和商业性渔业中回收,发现研究期间最初在较浅的深度(210-319 m)捕获的鱼的捕获率下降,钩伤,并保持两栖动物的捕食伤害。估计的总体丢弃死亡率为11.71%。此估计是基于假定的轻微钩伤鱼存活率96.5%,以及在每种钩伤严重程度下观察到的黑貂捕获率。该估计值可能低于商业性渔业的实际估计值,因为鱼的处理方式可能不如我们的研究那么仔细。将我们的结果与延绳钓渔业中钩钓伤害严重程度的相对发生率的数据进行比较,可能会导致更准确地计算可归因于捕鱼的总死亡率,并改善该物种的管理。

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