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首页> 外文期刊>Lakes & Reservoirs >Trends in interannual yield variation of reservoir fisheries in Bangladesh, with special reference to Indian major carps
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Trends in interannual yield variation of reservoir fisheries in Bangladesh, with special reference to Indian major carps

机译：孟加拉国水库渔业年产量变化的趋势，特别涉及印度主要鲤鱼

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摘要

Interannual variation in yield per species from a freshwater reservoir in Bangladesh was analysed by using long-term landing data. Each species was categorized according to characteristics in interannual yield variation. The characteristics were defined with respect to size of the interannual variation in terms of absolute and relative variation around the mean yield and long-term trends in catch levels. Annual variation was directly (t18 = 7.84; P < 0.01) related to the yield and can serve as a good indication of the status of the fishery when catches are low. The target fish, Indian major carps (IMC) Labeo rohita, Labeo calbasu, Catla catla and Cirrhinus mrigala, showed large variation in annual yield. This might have occurred because of variation in annual recruitment. Illegal use of gears is mostly related to variation in year class strength, and is assumed to be the most important source of change of stock variation. An increase in catch rate was recorded for Corica soborna. Such a stable combination may only be possible for a certain period without a long-term trend. Trends in the yield rate of the major fish category for three decades reveal a sharp decline in the catch of IMC. In contrast, small clupeid-like C. soborna have the highest yield rate. Fishing gears can play a crucial role in this fishery. Fisheries managers must always be alert when issuing fishing licenses and on the control on gears. The conclusion is that the IMC fishery of Kaptai Reservoir is an overexploited fish stock. In this fishery, the same gears are usually employed indiscriminately for different species and size classes. To stabilize the fishery, the existing policy needs to be strengthened and more effectively implemented. Also, some fishing gears and traps need to be restricted. An effective stock protection policy is suggested. Further study on catch size of individual species is essential prior to the development and implementation of any management scheme.
机译：通过使用长期登陆数据，分析了孟加拉国一个淡水水库的每个物种的年产量年际变化。根据年度产量变化的特征对每种物种进行分类。相对于年际变化的大小，就平均产量和捕捞水平的长期趋势周围的绝对和相对变化来定义特征。年度变化与产量直接相关（t18 = 7.84； P <0.01），可以很好地表明产量低时的渔业状况。目标鱼类印度主要鲤（IMC）拉比欧·罗塔塔（Labeo rohita），拉比欧·卡尔巴苏（Labeo calbasu），卡特拉·卡特拉（Catla catla）和米拉瓜（Cirrhinus mrigala）的年产量差异很大。这可能是由于年度招聘的差异而发生的。齿轮的非法使用主要与年级强度的变化有关，并且被认为是库存变化的最重要来源。记录到Corica soborna的捕获率增加。这种稳定的组合可能仅在一定时期内没有长期趋势才可能。三十年来主要鱼类类别的产量率趋势显示，IMC捕捞量急剧下降。相反，小类丘比特状梭状芽胞杆菌的产率最高。渔具可以在这种渔业中发挥关键作用。颁发钓鱼许可证和渔具管制时，渔业经理必须始终保持警惕。结论是，卡普泰水库的IMC渔业是过度开发的鱼类资源。在这种渔业中，通常对不同种类和大小类别不加区别地使用相同的渔具。为了稳定渔业，需要加强和更有效地执行现有政策。另外，一些渔具和陷阱也需要加以限制。建议采取有效的库存保护政策。在制定和实施任何管理计划之前，必须进一步研究单个物种的捕获量。

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  • 来源
    《Lakes & Reservoirs》 |2001年第1期|85-94|共10页
  • 作者

    Khan Kamal Uddin Ahmed; John B. Hambrey; Sanzidur Rahman;

  • 作者单位

    Bangladesh Fisheries Research Institute Riverine Sub-Station PO Box-8 Rangamati-4500 Bangladesh Bangladesh Fisheries Research Institute Riverine Sub-Station PO Box-8 Rangamati-4500 Bangladesh;

    Nautilus Consultants 30/6 Elbe Street Port of Leith Edinburgh EH67HW United Kingdom and;

    International Food Policy Research Institute 2033 K Street N.W. Washington D.C. 20006–1002 United States of America;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Bangladesh; interannual yield variation; reservoir fishery;

    机译：孟加拉国;年产量变化;水库渔业;

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