Exploring the demarcation requirements of fish breeding and nursery sites to balance the exploitation, management and conservation needs of Lake Victoria ecosystem
Exploring the demarcation requirements of fish breeding and nursery sites to balance the exploitation, management and conservation needs of Lake Victoria ecosystem
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DOI：
10.1111/fme.12311
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发表时间：
2019-10-01
影响因子：
2
通讯作者：
Wakwabi, Enock
中科院分区：
文献类型：
--
作者：
Aura, Christopher Mulanda;Nyamweya, Chrisphine Sangara;Wakwabi, Enock
据报告，重要淡水生态系统中的渔业资源受到巨大威胁，导致养护、管理和开发之间的冲突。这项研究确定了在维多利亚湖肯尼亚部分的这种生态系统中确定和绘制鱼类繁殖和育苗场的要求。这些标准的特点是利用土著知识、实地数据、繁殖地文献、大型无脊椎动物分布、幼虫和相对鱼类丰度、数字化、参与性绘图和定期取样。数据是从拖网和围网调查中收集的。利用量子地理信息系统软件对拟议的保护地点进行了数字化和制图。使用浮标和标记对场址进行了初步的实际划界。仔稚鱼多样性和丰富的所有七个河口和六个海湾调查的变化不大，繁殖区的一个重要方面。此外，与湖中的近海地点相比，大型无脊椎动物和鱼类多样性的优势加强了这一假设，即这些是产卵的关键生境和鱼类托儿所的首选生境。这种方法可以在全球范围内采用，以保证关键鱼类栖息地的长期完整性，促进可持续渔业管理和蓝色增长。
Fisheries resources in vital freshwater ecosystems have been reported to be under immense threat, resulting in conflicts between conservation, management and exploitation. This study established requirements for identifying and mapping fish breeding and nursery grounds in such ecosystems in the Kenyan part of Lake Victoria. The criteria were characterised by the use of indigenous knowledge, field data, literature on breeding sites, macroinvertebrates distribution, larval and relative fish abundances, digitisation, participatory mapping, and periodic sampling. Data were collected from trawl and seine net surveys. Digitisation and mapping of the proposed conservation sites were carried out using Quantum GIS software. Participatory physical demarcation of sites was done using buoys and markers. Larval and juvenile fishes were diverse and abundant in all seven river mouths and six bays surveyed with little variance; an important aspect of breeding areas. Additionally, a preponderance of macroinvertebrates and high fish diversity compared with offshore sites in the lake strengthened the hypothesis that these are critical habitats for spawning and preferred habitats for nurseries for fish. The approach can be adopted globally to guarantee the long-term integrity of critical fish habitats for sustainable fisheries management and blue growth.