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Local management to support local fisheries: Rāhui (temporary closure) and bag limits for blackfoot abalone (Haliotis iris) in southern New Zealand
Aquatic Conservation: Marine and Freshwater Ecosystems ( IF 2.4 ) Pub Date : 2021-08-03 , DOI: 10.1002/aqc.3662
Gaya Gnanalingam 1, 2 , Daniel W. Pritchard 1, 2 , Derek K. Richards 1, 2 , Peri Subritzky 1, 2 , Brendan Flack 3, 4 , Christopher D. Hepburn 1, 4
Affiliation  

  1. Spatially discrete stocks that vary in life history traits on a reef-to-reef scale present a challenge for fisheries managers. Nationally or regionally applied one-size-fits-all approaches to management fail to account for this variability, and when coupled with fishing pressure this can result in serial depletion and localized extinction.
  2. Where mechanisms for local management exist, as they do in New Zealand via customary protection areas (Taiāpure Local Fisheries, Mātaitai Reserves), managers have the opportunity to trial tools on scales relevant to the stocks managed. This study assesses the effect of bag limits and a rāhui (temporary closure) in managing the spatially discrete, and culturally important, blackfoot abalone (Haliotis iris, pāua) in the East Otago Taiāpure, in southern New Zealand.
  3. Using surveys spanning 8 years and 26 sites, the rāhui was found to have had mixed results: halting the decline in pāua density at 0 m but not 0.5 m depths. The rāhui did, however, result in an increase in the percentage of individuals above the minimum legal size at both depths.
  4. Where bag limits alone had been applied, pāua densities and the percentage of legal-sized individuals continued to decline over the 8-year period, with the loss of large individuals, translating into a decline in estimated egg production.
  5. Growth estimates from mark–recapture and surveys of juvenile abundance at sites inside and outside the rāhui highlight the fine-scale variability in pāua life history even within this local area. This suggests there may be biological impediments to pāua management using bag limits alone.
  6. Though pāua restoration efforts have had mixed results to date, this study highlights the potential for legally empowered local managers and communities to respond to fisheries declines in their own local area in an action-driven, adaptable, and timely way.


中文翻译:

支持当地渔业的当地管理:Rāhui(临时关闭)和新西兰南部黑足鲍(Haliotis iris)的袋装限制

  1. 在珊瑚礁到珊瑚礁范围内生活史特征不同的空间离散种群给渔业管理者带来了挑战。国家或地区采用的一刀切的管理方法无法解释这种可变性,当加上捕捞压力时,这可能导致连续枯竭和局部灭绝。
  2. 在存在当地管理机制的地方,就像他们在新西兰通过习惯保护区(Taiāpure 当地渔业、Mātaitai 保护区)所做的那样,管理人员有机会在与管理的种群相关的规模上试用工具。本研究评估了袋子限制和 rāhui(临时关闭)在管理新西兰南部东奥塔哥泰阿普尔的空间离散且具有重要文化意义的黑足鲍(Haliotis iris,pāua)方面的影响。
  3. 使用跨越 8 年和 26 个地点的调查,发现 rāhui 的结果好坏参半:在 0 m 但不是 0.5 m 深度停止了 pāua 密度的下降。然而,rāhui 确实导致在两个深度超过最小合法尺寸的个体百分比增加。
  4. 在仅适用袋子限制的情况下,鲍鱼密度和合法体型个体的百分比在 8 年期间继续下降,大量个体的流失,转化为估计产蛋量的下降。
  5. 对 rāhui 内外地点的标记重新捕获和幼鱼丰度调查的增长估计突出了 pāua 生活史的精细变化,即使在该地区也是如此。这表明单独使用行李限制可能对 pāua 管理存在生物学障碍。
  6. 尽管迄今为止波阿恢复工作的结果喜忧参半,但这项研究强调了获得法律授权的当地管理者和社区以行动驱动、适应性强和及时的方式应对本地区渔业衰退的潜力。
更新日期:2021-09-10
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