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首页> 外文期刊>Ocean & coastal management >Size structure and gear selectivity of target species in the multispecies multigear fishery of the Kenyan South Coast
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Size structure and gear selectivity of target species in the multispecies multigear fishery of the Kenyan South Coast

机译：肯尼亚南海岸多物种多齿轮渔业中目标物种的大小结构和渔具选择性

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摘要

Multispecies fisheries commonly target those species and sizes that provide highest revenues (due to both their high abundances and market values) using multiple gears. Yet most tropical countries still apply single species management approaches, which ignore species- species and species- gear interactions in these complex fisheries. The objective of the here presented study was to evaluate the role and importance of the different fishing gears for the exploitation of the different species and sizes of the artisanal reef fishery catch from the Kenyan South Coast. Like in most tropical multi-species fisheries, the artisanal catch was characterized by a very large number of species (138 species representing 38 families). Of these, 17 species dominated the catch making up 91% of the overall abundance and 70% by weight of the total catch from all gears. Species belonging to the families Siganidae, Scaridae and Lethrinidae dominated the catch of most gears. Species selectivity by gear was determined by a classification analysis (hierarchical agglomerative clustering) based on a similarity matrix from transformed abundance data of the fish species by gear. At a similarity of 50%, five groups were differentiated by the cluster dendrogram. Considerable species and size overlap was observed between gears with the basket trap and beach seine showing very similar selectivity with the composition of their catches to a large extent being complementary. Overall the beach seine landed the smallest individuals in the catch with the key species captured being smaller than the size at first maturity but only contributed 10% of the total biomass landed compared to the basket traps which also targeted similar size ranges but at higher relative abundance and biomass. The hook and line method and the ring net targeted the largest individuals in the catch but the hook and line contributed more in terms of the total biomass landed (31%). Our findings indicate that the current fishing practices exploit fish species of small sizes but also small to medium sized specimens relative to the species potential maximum size. Therefore, fishers by diversifying their gears and strategies, have been able to target a significant part of the entire fish assemblage (species and sizes) with each gear imposing different fishing mortalities on the target species. This fishery strategy is a major challenge to decision-makers, and it is evident that the current regulations focusing on gear restrictions are not adequate to manage this complex and highly effective fishery. Thus, our proposal is that in addition to the current measures, an attempt should be made towards an integrated approach that incorporates the fishing dynamics and distribution of effort across different gears while complementing these with market based regulatory measures. Therefore, an important next step in the analysis of the fishery of Kenya's coast should be the determination of the present exploitation rate of the target species along the resource size spectrum both temporally and spatially to provide a proper assessment of the fisheries and provide a more succinct management advice towards reallocation of fishing effort among alternative target species in this multispecies fisheries. (C) 2016 Elsevier Ltd. All rights reserved.
机译：多物种渔业通常以使用多种渔具提供最高收入（由于其丰度高和市场价值高）的物种和规模为目标。然而，大多数热带国家仍采用单一物种管理方法，而忽略了这些复杂渔业中的物种-物种和物种-齿轮相互作用。此处提出的研究的目的是评估不同渔具对肯尼亚南海岸手工珊瑚礁捕捞物不同种类和大小的开发的作用和重要性。像大多数热带多物种渔业一样，手工捕捞的特点是种类繁多（138个种类，代表38个科）。在这些种类中，有17种占主导地位，占全部渔获量的91％，占总渔获物重量的70％。大部分鱼类的捕捞种类都属于西科科（Siganidae），金龟科（Scaridae）和狐猴科（Lethrinidae）。基于相似度矩阵的分类分析（分层集聚聚类），通过齿轮鱼类物种的丰度数据的转换分析，确定了齿轮鱼类的选择性。相似度为50％，通过聚类树状图来区分五个组。在网箱捕捞器和沙滩围网之间的齿轮之间观察到相当大的物种和大小重叠，显示出非常相似的选择性，并且捕捞器的组成在很大程度上是互补的。总体而言，围网捕捞的渔获量最小，捕获的关键物种小于首次成熟时的捕捞量，但与目标面积范围相似但相对丰度较高的篮筐捕捞器相比，仅占登陆的总生物量的10％。和生物质。钩线法和环网针对渔获物中最大的个体，但是钩线法对登陆的总生物量的贡献更大（31％）。我们的发现表明，当前的捕捞实践利用的是小尺寸鱼类，但相对于该物种潜在的最大尺寸，还捕捞了中小型标本。因此，渔民通过多样化的渔具和策略，已经能够针对整个鱼类种群（种类和大小）的很大一部分，而每个渔具都会对目标物种施加不同的捕捞死亡率。这种渔业战略是决策者面临的主要挑战，很明显，目前侧重于渔具限制的现行法规不足以管理这种复杂而高效的渔业。因此，我们的建议是，除了现行措施外，还应尝试采取一种综合方法，将捕捞动力和努力跨部门的分配结合起来，同时以市场为基础的监管措施加以补充。因此，对肯尼亚沿海渔业进行分析的一个重要的下一步应该是沿着资源规模在时间和空间上确定目标物种的当前利用率，以提供对渔业的适当评估并提供更为简洁的信息。在该多物种渔业的其他目标物种之间重新分配捕捞努力的管理建议。 （C）2016 Elsevier Ltd.保留所有权利。

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  • 来源
    《Ocean & coastal management》 |2016年第9期|95-106|共12页
  • 作者

    Tuda Paul M.; Wolff Matthias; Breckwoldt Annette;

  • 作者单位

    Leibniz Ctr Trop Marine Ecol ZMT GmbH, Fahrenheitstr 6, D-28359 Bremen, Germany|Univ Bremen, Fac Biol & Chem FB2, POB 33 04 40, D-28334 Bremen, Germany;

    Leibniz Ctr Trop Marine Ecol ZMT GmbH, Fahrenheitstr 6, D-28359 Bremen, Germany;

    Leibniz Ctr Trop Marine Ecol ZMT GmbH, Fahrenheitstr 6, D-28359 Bremen, Germany;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Kenya; Gear selectivity; Artisanal; Reef; Multispecies;

    机译：肯尼亚;齿轮选择性;手工;礁;多物种;

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