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Selecting species specific vitality metrics to predict red king crab (Paralithodes camtschaticus) discard survival
Fisheries Research ( IF 2.2 ) Pub Date : 2021-04-12 , DOI: 10.1016/j.fishres.2021.105964
Cory Lescher , Noëlle Yochum , Brad Harris , Nathan Wolf , John Gauvin

Quantifiable behavior and reflex responses, termed “vitality assessment metrics”, have successfully linked impact from the commercial fishery capture and handling process with post-discard survival. These metrics have been effectively applied to commercially important crab species, including Tanner (Chionoecetes bairdi) and snow crab (C. opilio) bycaught in the Eastern Bering Sea groundfish bottom trawl fishery. When applied to red king crab (RKC; Paralithodes camtschaticus) in the same fishery, those metrics had limited success. We examined a suite of candidate RKC-specific metrics based on prior studies as well as several recommended by commercial fishermen. Provisional testing in a laboratory setting was used to narrow the list of metrics for field testing to include only those to which RKC showed consistent and definitive responses. Ultimately, seven vitality metrics were advanced for at-sea testing on RKC caught during commercial groundfish bottom trawl fishing. A total of 55 RKC were collected, 37 on deck as the codend was emptied and 18 from the below-deck factory at the regulatory point of discard. An initial assessment testing for the presence of the seven metrics was conducted immediately upon collection, generating a vitality score based on the number of absences. Crabs were tagged for individual tracking and held for 72 -hs in seawater tanks for re-assessment at 2, 4, 6, 12, 24, 48 and 72 -hs. Crab collected from the factory had higher initial impairment scores based on the vitality metrics than crab collected from the deck. In total, 6 crab, with higher impairment scores, died and the remaining 49, with lower impairment scores, showed evidence of strong to moderate recovery and were discarded alive after 72 -hs. Results from this study indicate that our species-specific vitality metrics successfully captured impairment, initial recovery and short-term mortality. This work elucidated the relationship between RKC impairment and delayed discard mortality, providing a mechanism to generate quantitative post-discard mortality rates in future studies.



中文翻译:

选择特定于物种的生命力指标来预测红帝王蟹(Paralithodes camtschaticus)丢弃的存活率

被称为“生命力评估指标”的可量化行为和反射反应已成功地将商业渔业捕捞和处理过程的影响与丢弃后的生存联系起来。这些指标已有效地应用于商业上重要的螃蟹物种,包括在白令海底海底拖网捕捞中捕获的丹纳(Chionoecetes bairdi)和雪蟹(C. opilio)。当应用于红色帝王蟹(RKC; Paralithodes camtschaticus)在同一个渔业中,这些指标取得的成功有限。我们根据先前的研究以及商业渔民推荐的几种方法,研究了一套针对RKC的候选指标。实验室中的临时测试用于缩小现场测试指标的范围,以仅包括RKC表现出一致且确定的响应的指标。最终,针对在商业底层鱼底拖网捕捞中捕获的RKC进行海上测试,提出了七个活力指标。总共收集了55个RKC,其中的37个是在清空了编码区后在甲板上收集的,还有18个是在丢弃管理点从甲板下的工厂中收集的。收集后立即对这七个指标的存在进行了初步评估测试,并根据缺席的数量生成了活力评分。标记螃蟹以进行单独追踪,并在海水缸中放置72小时,以便在2、4、6、12、24、48和72小时重新评估。根据活力指标,从工厂收集的螃蟹比从甲板收集的螃蟹具有更高的初始损伤评分。总共有6个损伤评分较高的螃蟹死亡,其余49个损伤评分较低的螃蟹显示出强至中度恢复的迹象,并在72小时后被活着丢弃。这项研究的结果表明,我们特定物种的生命力指标成功捕获了损伤,初始恢复和短期死亡率。这项工作阐明了RKC损害与延迟丢弃死亡率之间的关系,为将来的研究中提供定量的丢弃后死亡率提供了一种机制。4、6、12、24、48和72小时 根据活力指标,从工厂收集的螃蟹比从甲板收集的螃蟹具有更高的初始损伤评分。总共有6个损伤评分较高的螃蟹死亡,其余49个损伤评分较低的螃蟹显示出强至中度恢复的迹象,并在72小时后被活着丢弃。这项研究的结果表明,我们特定物种的生命力指标成功捕获了损伤,初始恢复和短期死亡率。这项工作阐明了RKC损害与延迟丢弃死亡率之间的关系,为将来的研究中提供定量的丢弃后死亡率提供了一种机制。4、6、12、24、48和72小时 根据活力指标,从工厂收集的螃蟹比从甲板收集的螃蟹具有更高的初始损伤评分。总共有6个损伤评分较高的螃蟹死亡,其余49个损伤评分较低的螃蟹显示出强至中度恢复的迹象,并在72小时后被活着丢弃。这项研究的结果表明,我们特定物种的生命力指标成功捕获了损伤,初始恢复和短期死亡率。这项工作阐明了RKC损害与延迟丢弃死亡率之间的关系,为将来的研究中提供定量的丢弃后死亡率提供了一种机制。总共有6个损伤评分较高的螃蟹死亡,其余49个损伤评分较低的螃蟹显示出强至中度恢复的迹象,并在72小时后被活着丢弃。这项研究的结果表明,我们特定物种的生命力指标成功捕获了损伤,初始恢复和短期死亡率。这项工作阐明了RKC损害与延迟丢弃死亡率之间的关系,为将来的研究中提供定量的丢弃后死亡率提供了一种机制。总共有6个损伤评分较高的螃蟹死亡,其余49个损伤评分较低的螃蟹显示出强至中度恢复的迹象,并在72小时后被活着丢弃。这项研究的结果表明,我们特定物种的生命力指标成功捕获了损伤,初始恢复和短期死亡率。这项工作阐明了RKC损伤与延迟丢弃死亡率之间的关系,为将来的研究中提供定量的丢弃后死亡率提供了一种机制。初步恢复和短期死亡率。这项工作阐明了RKC损害与延迟丢弃死亡率之间的关系,为将来的研究中提供定量的丢弃后死亡率提供了一种机制。初步恢复和短期死亡率。这项工作阐明了RKC损害与延迟丢弃死亡率之间的关系,为将来的研究中提供定量的丢弃后死亡率提供了一种机制。

更新日期:2021-04-12
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