Optimizing the prediction of discard survival of bottom-trawled plaice based on vitality indicators.

IF 2.6 3区 环境科学与生态学 Q2 BIODIVERSITY CONSERVATION Conservation Physiology Pub Date : 2024-10-09 eCollection Date: 2024-01-01 DOI:10.1093/conphys/coae070
Sven Sebastian Uhlmann, Esther Savina, Junita Karlsen, Bart Ampe
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Abstract

Predicting the discard survival of aquatic animals after fisheries capture using vitality indicators (i.e. individual scores or indices of physical condition) is a resource-efficient approach compared to estimating discard survival from captive observation. But such indicators do not always lead to accurate and robust predictions. Individual scores of reflex impairments and injuries are typically given the same weight when being aggregated into an index, while some reflexes or injuries may contribute to mortality more than others. This study established an analytical methodology and created an index based on differential contributions of individual reflexes and injuries to optimize the prediction of discard survival of bottom-trawled European plaice (Pleuronectes platessa). The optimization procedures were applied to a dataset from vitality assessment of 1122 undersized plaice caught during 16 commercial fishing trips and 58 gear deployments in Belgium and Denmark. As welfare indicators, we considered and evaluated against post-capture survival of plaice: original vs. optimized reflex impairment and injury (R&I) index, number of absent reflexes, number of present injuries, number of absent reflexes and present injuries, categorical vitality score and individual reflex and injury scores. These were used in eight candidate generalized linear models (one without any vitality indicator) as explanatory variables to predict survival, with or without biological, environmental, technical and operational covariates, either at the individual fish or trip level. Bruising to the head and body were the most relevant predictors. The optimized R&I index did not perform better than any other vitality indicator, and all the indicators performed poorly in predicting survival probability both at the fish and trip levels without information on air exposure and seawater temperature. This means that they cannot be considered to be independent measures. The categorical vitality score provided a viable alternative to the more labour-intensive, scoring method of reflex responsiveness. Use of reflexes as proxies may not be accurate when they are not independent of environmental, biological or technical variables.

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根据活力指标优化底拖网鲽鱼弃鱼存活率预测。
利用生命力指标(即个体评分或身体状况指数)预测水生动物在渔业捕捞后的丢弃存活率,是一种比通过人工观察估计丢弃存活率更节省资源的方法。但这些指标并不总能带来准确和可靠的预测。在汇总成指数时,反射性损伤和受伤的单项得分通常被赋予相同的权重,而某些反射性损伤或受伤对死亡率的影响可能比其他损伤或受伤对死亡率的影响更大。本研究建立了一种分析方法,并根据单个反射和损伤的不同贡献创建了一个指数,以优化底拖网捕捞的欧洲鲽(Pleuronectes platessa)的弃鱼存活率预测。优化程序应用于对比利时和丹麦的 16 次商业捕捞和 58 次渔具布放过程中捕获的 1122 条尺寸不足的鲽鱼的生命评估数据集。作为福利指标,我们考虑并评估了鲽鱼捕获后的存活率:原始反射损伤和损伤(R&I)指数与优化后的反射损伤和损伤(R&I)指数、反射缺失数、存在损伤数、反射缺失和存在损伤数、分类生命力评分以及单个反射和损伤评分。在八个候选的广义线性模型(其中一个不含任何生命力指标)中,将这些指标作为解释变量,与或不与生物、环境、技术和操作协变量一起,在单条鱼或行程水平上预测存活率。头部和身体挫伤是最相关的预测因素。在没有空气暴露和海水温度信息的情况下,优化的 R&I 指数并不比任何其他生命力指标表现得更好,而且所有指标在预测鱼类和行程层面的存活概率方面都表现不佳。这意味着它们不能被视为独立的衡量指标。分类生命力评分提供了一种可行的替代方法,以替代劳动密集型的反射反应性评分方法。当条件反射与环境、生物或技术变量无关时,使用条件反射作为代用指标可能并不准确。
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来源期刊
Conservation Physiology
Conservation Physiology Environmental Science-Management, Monitoring, Policy and Law
CiteScore
5.10
自引率
3.70%
发文量
71
审稿时长
11 weeks
期刊介绍: Conservation Physiology is an online only, fully open access journal published on behalf of the Society for Experimental Biology. Biodiversity across the globe faces a growing number of threats associated with human activities. Conservation Physiology will publish research on all taxa (microbes, plants and animals) focused on understanding and predicting how organisms, populations, ecosystems and natural resources respond to environmental change and stressors. Physiology is considered in the broadest possible terms to include functional and mechanistic responses at all scales. We also welcome research towards developing and refining strategies to rebuild populations, restore ecosystems, inform conservation policy, and manage living resources. We define conservation physiology broadly and encourage potential authors to contact the editorial team if they have any questions regarding the remit of the journal.
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