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首页> 外文期刊>Estuarine Coastal and Shelf Science >Environmental indices for spanner crab (Ranina ranina) catch rates depend on regional oceanographic features
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Environmental indices for spanner crab (Ranina ranina) catch rates depend on regional oceanographic features

机译：扳手蟹（Ranina ranina）捕获率的环境指数取决于区域海洋特征

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摘要

In the Australian spanner crab (Ranina ranina) fishery, management and industry are looking for improvements to the existing indicators of stock abundance. Prior research linked several oceanographic indices to the catchability of spanner crabs; however, it was unclear whether nearshore (e.g. river-runoff) or region-specific oceanographic features (e.g. eddies and the East Australian Current) are responsible for these effects on catch rates. Using satellite remote sensing and fishery-independent survey data, we analysed the influence of oceanographic and environmental indices on spanner crab catch rates in southern Queensland. Outputs from Generalised Additive Models (GAM) show that catch rates exhibit a large amount of variability between different regions of the fishery, with highest catch rates at fishing grounds within 40 km from the shelf break. Offshore oceanic waters, transported into various regions by different oceanographic processes, were linked to an increase in catch rates. Lower concentrations of surface chlorophyll a were also correlated with higher catch rates, but only in survey regions exposed to the effects of the Fraser Gyre and at the mouth of bays. Overall, results highlighted that the effects of environmental indices on catch rates were not homogeneous across the fishery. Rather, relationships were linked to region-specific (< 100 km), highly dynamic coastal and oceanographic features that dominate different survey regions. Outcomes from this work show that the spatial variability of oceanographic features should be taken into consideration before incorporating oceanographic indices in fishery stock assessment models.
机译：在澳大利亚的甲蟹（Ranina ranina）渔业中，管理和工业界都在寻求对现有种群数量指标的改进。先前的研究将几种海洋学指标与扳手蟹的可捕性联系起来；但是，尚不清楚近岸（例如河流径流）或特定地区的海洋特征（例如涡流和东澳大利亚洋流）是否对捕获率产生这些影响。利用卫星遥感和不依赖渔业的调查数据，我们分析了海洋和环境指数对昆士兰州南部的螃蟹捕获率的影响。广义加性模型（GAM）的输出表明，捕捞率在渔业不同区域之间表现出很大的变异性，在距架子断裂40公里以内的渔场中捕捞率最高。通过不同的海洋学过程运输到各个区域的近海海水与捕获率的提高有关。较低的表面叶绿素a浓度也与较高的捕获率相关，但仅在暴露于Fraser Gyre影响的调查区域和海湾口处。总体而言，结果突出表明，环境指数对捕捞率的影响在整个渔业中并非均一。而是将关系与特定区域（<100 km），高度动态的沿海和海洋特征相关联，这些特征主导着不同的调查区域。这项工作的结果表明，在将海洋学指标纳入渔业种群评估模型之前，应考虑海洋学特征的空间变异性。

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  • 来源
    《Estuarine Coastal and Shelf Science》 |2019年第15期|106361.1-106361.17|共17页
  • 作者

    Spencer David M.; Doubell Mark J.; Brown Ian W.; Rodriguez Ana Redondo; Lee Shing Y.; Lemckert Charles J.;

  • 作者单位

    Griffith Univ Sch Engn & Built Environm Gold Coast Qld 4222 Australia|SARDI Aquat Sci Adelaide SA 5024 Australia|Tohoku Natl Fisheries Res Inst Shiogama Miyagi 9850001 Japan|3-27-5 Shinhamacho Shiogama Miyagi 9850001 Japan;

    SARDI Aquat Sci Adelaide SA 5024 Australia;

    5 Baringa St Brisbane Qld 4019 Australia;

    Chinese Univ Hong Kong Sch Life Sci Simon FS Li Marine Sci Lab Shatin Hong Kong Peoples R China|Chinese Univ Hong Kong Earth Syst Sci Programme Shatin Hong Kong Peoples R China;

    Univ Canberra Built Environm & Design Canberra ACT 2617 Australia;

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