Fisheries Research ( IF 2.4 ) Pub Date : 2020-12-21 , DOI: 10.1016/j.fishres.2020.105841 Vladlena V. Gertseva , Sean E. Matson
Fisheries stock assessments rely heavily on historical catch information to understand how a stock responds to exploitation and make meaningful forecasts under alternative management and environmental scenarios. However, for many bycatch species historical removals are virtually unknown, as a large portion of the catch was discarded at sea. For example, historical discard of elasmobranch species such as skates and sharks have been reported as 95 percent of the total catch based on available data. The longnose skate is one the most abundant groundfishes on the continental slope of the U.S. Pacific Coast by biomass, and the most abundant skate species in the Northeast Pacific Ocean. We developed a method to estimate catch of longnose skate on the U.S. West Coast based on the catch of Dover sole, a co-occurring targeted species with which longnose skate is caught. This method allowed us to reconstruct historical longnose skate catches back to the beginning of the bottom trawl fisheries and improve stock assessment for this species. We also examined the impact of using our method versus other common methods of catch reconstruction to inform stock assessment models, and found that the target-based predictive method produced results that more accurately reflected the life history and typical stock dynamics of elasmobranch taxa. Our method is not limited to the specific case of longnose skate and could be easily adapted for other species and areas.
中文翻译:
恰到好处:利用目标种群的数据重建兼捕物种的清除,以东北太平洋长鼻滑冰为例
渔业种群评估在很大程度上依赖于历史捕捞信息,以了解种群如何应对开采并在替代管理和环境情景下做出有意义的预测。但是,对于许多副渔获物物种,历史捕捞量实际上是未知的,因为大部分渔获物是在海上丢弃的。例如,根据现有数据,历史上丢弃的滑冰物种(如冰鞋和鲨鱼)已占总捕捞量的95%。长鼻溜冰者是生物量最多的美国太平洋海岸大陆坡上的底层鱼类之一,也是东北太平洋最丰富的溜冰物种。我们根据Dover鞋底的渔获量,开发了一种方法来估算美国西海岸的长鼻滑冰渔获量,捕获长鼻溜冰的共同目标物种。这种方法使我们能够将历史悠久的长鼻子滑冰渔获物重建到拖网底渔场的起点,并改善该物种的种群评估。我们还检查了使用我们的方法与其他常见的渔获物重建方法来建立种群评估模型的影响,发现基于目标的预测方法所产生的结果能够更准确地反映弹bra类群的生活史和典型种群动态。我们的方法不仅限于长鼻滑冰的具体情况,还可以轻松地适用于其他物种和地区。我们还检查了使用我们的方法与其他常见的渔获物重建方法来建立种群评估模型的影响,发现基于目标的预测方法所产生的结果能够更准确地反映弹bra类群的生活史和典型种群动态。我们的方法不仅限于长鼻滑冰的特定情况,而且可以轻松地适用于其他物种和地区。我们还检查了使用我们的方法与其他常见的渔获物重建方法来建立种群评估模型的影响,发现基于目标的预测方法所产生的结果能够更准确地反映弹bra类群的生活史和典型种群动态。我们的方法不仅限于长鼻滑冰的特定情况,而且可以轻松地适用于其他物种和地区。