当前位置: X-MOL 学术Fish. Res. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Development of an industry-funded fishery-independent survey and associated indices for managing a deep sea crab resource in Western Australia
Fisheries Research ( IF 2.4 ) Pub Date : 2022-03-22 , DOI: 10.1016/j.fishres.2022.106296
Jason How , Simon de Lestang , Benjamin Hebiton , Ainslie Denham

The inclusion of fishery-independent data in stock assessments has been shown to have positive stock and financial outcomes for fisheries. A co-management approach between the government and commercial fishers in this limited-entry fishery led to the successful implementation of industry-funded, fishery-independent surveys of crystal crab, a deep water Geryonid crab, in two areas off Western Australia.

While the instigation of these surveys was driven by a need for improved abundance indices for stock assessment, they have also provided an opportunity to better understand stock dynamics and composition. Structuring the surveys across the depth distribution (400–700 m) of crystal crabs demonstrated an apparent lack of depth-related size stratification in crystal crabs with large crabs captured throughout the species depth distribution. Female crabs, which mature below the legal minimum size for harvest, were a minor component of the catch and were more prevalent at the shallower end of their depth distribution. There also appeared to be a movement of pre-molt crabs to the periphery of their distribution (shallow and deep), in preparation to molt.

There was a slight decline in the fishery-independent abundance (FIA) index from 2017 to 2019 mirroring the pattern displayed by the current standardized commercial catch rate, with an increase during the most recent survey (2020). The FIA index will be incorporated as an additional data source for the weight of evidence and size-structured integrated model for the assessment of the crystal crab resource off the west coast of Western Australia.

The surveys, which were funded by industry and supported by government research staff onboard, have proved cost-effective, robust and sustainable, and a preferable means by which fishery-independent data could be collected for this commercially important Geryonid crab. The cost of the survey was partially offset by the retention of the legal catch. Such a collaborative model could be applied in fisheries world-wide to address the inherent biases of commercially-derived indices and the ever-increasing financial constraints on regulators to conduct stock assessments.



中文翻译:

开发由行业资助的独立渔业调查和相关指数,用于管理西澳大利亚州的深海蟹资源

在种群评估中纳入独立于渔业的数据已被证明对渔业具有积极的种群和财务成果。在这个限制进入的渔业中,政府和商业渔民之间的共同管理方法导致在西澳大利亚附近的两个地区成功实施了由行业资助的、独立于渔业的水晶蟹调查,水晶蟹是一种深水 Geryonid 蟹。

虽然发起这些调查的原因是需要改进用于种群评估的丰度指数,但它们也为更好地了解种群动态和组成提供了机会。对水晶蟹的深度分布(400-700 m)进行调查表明,水晶蟹明显缺乏与深度相关的尺寸分层,在整个物种深度分布中捕获的大蟹。成熟的雌蟹低于法定捕捞的最小尺寸,是捕获量的次要组成部分,在其深度分布的较浅端更为普遍。蜕皮前的螃蟹似乎也向分布的外围(浅层和深层)移动,准备蜕皮。

从 2017 年到 2019 年,独立于渔业的丰度(FIA)指数略有下降,反映了当前标准化商业捕捞率所显示的模式,而在最近的调查(2020 年)期间有所上升。FIA 指数将作为证据权重和规模结构综合模型的附加数据源,用于评估西澳大利亚西海岸的水晶蟹资源。

这些由工业界资助并得到船上政府研究人员支持的调查已证明具有成本效益、稳健和可持续,并且是一种可用于收集这种具有商业重要意义的 Geryonid 蟹的独立于渔业的数据的优选方式。保留合法渔获量部分抵消了调查费用。这种合作模式可以应用于世界范围内的渔业,以解决商业衍生指数的固有偏差以及监管机构进行种群评估的日益增加的财务限制。

更新日期:2022-03-22
down
wechat
bug