Local ecological knowledge (LEK) suggests overfishing and sequential depletion of Peruvian coastal groundfish

IF 1.8 3区 农林科学 Q2 FISHERIES Marine and Coastal Fisheries Pub Date : 2023-11-14 DOI:10.1002/mcf2.10272
Fabio Castagnino, Rodrigo A. Estévez, Matías Caillaux, Ximena Velez-Zuazo, Stefan Gelcich
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Abstract

Objective

Fish populations targeted by recreational and artisanal fisheries remain largely unassessed in low- and middle-income countries. This generally results in a lack of regulatory action from government agencies, thus aggravating the risk of overfishing. In this context, sources of historical information, such as local ecological knowledge (LEK), are key to providing insight on the status of fish populations and informing management. Systematized elicitation processes have increasingly shown an ability to produce quantitative indicators while reducing biases and caveats inherent to expert knowledge. In this study, we assessed changes in composition of the catch, species abundance, and geographical distribution of the catch for 10 data-poor coastal groundfish species of Peru using LEK.

Methods

We designed and conducted a structured elicitation process to gather LEK on these species from 40 recreational and commercial spearfishers in Peru. We then used the obtained data to develop a set of indices and analyzed them statistically to identify trends and the magnitude of changes over time, if any, between the years 1960 and 2019.

Result

Our results show a significant decline in the relative participation (a species' catch proportion relative to the total catch) and abundance of seven assessed species in the catch as well as a major reduction in their geographical distribution. For some species, decreases in relative participation within the catch and decreases in average daily catch, a measure that may indicate changes in abundance, were statistically significant across the time span of the study. Average daily catch was between 1% and 15% of their historical high values. Some species have experienced a reduction of 60–100% in the geographical distribution of their catch.

Conclusion

Results suggests a scenario of overfishing and sequential depletion of the Galapagos Sheephead Wrasse Semicossyphus darwini, Pacific Goliath Grouper Epinephelus quinquefasciatus, Harlequin Wrasse Bodianus eclancheri, Grape-eye Seabass Hemilutjanus macrophthalmos, Chino Medialuna ancietae, Pacific Beakfish Oplegnathus insignis, and Broomtail Grouper Mycteroperca xenarcha. We highlight how the application of expert elicitation methods can help to build LEK-based fishery indicators that are useful for assessing data-poor fisheries and providing critical information to prompt management discussions.

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当地生态知识(LEK)表明过度捕捞和秘鲁沿海底栖鱼的连续枯竭
在低收入和中等收入国家,休闲渔业和手工渔业所针对的鱼类种群在很大程度上仍未得到评估。这通常导致政府机构缺乏监管行动,从而加剧了过度捕捞的风险。在这种情况下,当地生态知识(LEK)等历史信息来源是了解鱼类种群状况和为管理提供信息的关键。系统化的启发过程越来越显示出产生定量指标的能力,同时减少了专业知识固有的偏见和警告。在这项研究中,我们使用LEK评估了秘鲁10种数据贫乏的沿海底栖鱼类的渔获量组成、物种丰度和地理分布的变化。方法我们设计并实施了一个结构化的诱导过程,从秘鲁40名休闲和商业鱼叉渔民那里收集这些物种的LEK。然后,我们利用获得的数据制定了一套指数,并对其进行统计分析,以确定1960年至2019年期间的趋势和变化幅度。结果7个被评估物种的相对参与(一个物种的渔获量占总渔获量的比例)和渔获丰度显著下降,地理分布明显减少。对于某些物种来说,相对参与捕捞的减少和平均每日捕捞量的减少(一种可能表明丰度变化的措施)在研究的时间跨度内具有统计学意义。平均每日捕获量在其历史最高捕获量的1%至15%之间。一些物种的渔获物地理分布减少了60-100%。结论加拉帕戈斯羊头濑鱼、太平洋歌利亚石斑鱼、太平洋歌利亚石斑鱼、斑点濑鱼、葡萄眼海鲈、中国古代海鲈、太平洋喙鱼、褐尾石斑鱼存在过度捕捞和序贯枯竭的情况。我们强调专家启发方法的应用如何有助于建立基于lek的渔业指标,这些指标有助于评估缺乏数据的渔业,并为促进管理讨论提供关键信息。
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来源期刊
Marine and Coastal Fisheries
Marine and Coastal Fisheries FISHERIES-MARINE & FRESHWATER BIOLOGY
CiteScore
3.40
自引率
5.90%
发文量
40
审稿时长
>12 weeks
期刊介绍: Marine and Coastal Fisheries: Dynamics, Management, and Ecosystem Science publishes original and innovative research that synthesizes information on biological organization across spatial and temporal scales to promote ecologically sound fisheries science and management. This open-access, online journal published by the American Fisheries Society provides an international venue for studies of marine, coastal, and estuarine fisheries, with emphasis on species'' performance and responses to perturbations in their environment, and promotes the development of ecosystem-based fisheries science and management.
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