Fishes of the Alitash National Park: Taxonomic Accounts with Identification Keys of Fish in Floodplain Rivers of Abbay and Tekeze Basins, Ethiopia

IF 0.7 4区 农林科学 Q4 FISHERIES
Alamrew Eyayu, Abebe Getahun
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Abstract

Ethiopia has considerable freshwater potential. Currently, the recognized fish diversity in the country’s freshwater ecosystem is more than 200. Despite the presence of such high fish diversity with considerable economic returns, ichthyofaunal studies on Ethiopian rivers are scarce. Thus, this study aimed to identify and compare ichthyofaunal diversity and distribution in floodplain rivers of the Abbay and Tekeze Basins, Ethiopia. Fish were collected using gillnets, cast nets, hooks, electrofishing, and mosquito nets and identified to the species level. Gillnets had stretched mesh sizes of 4–14 cm with a panel length of 25–75 m and a width of 1.5–2 m per mesh size. They were set in the afternoon (5:00 p.m.) and lifted the following morning (7:30 a.m.). Immediately after capture, fish were preliminary identified in the field and tagged with proper information (e.g., sampling locality and date of collection). Similar fishing efforts were applied at all sampling sites for two dry and two wet months over a period of two years (2018-2019). In the present study, both alpha and beta diversity indices were also examined. Identification keys and an annotated checklist of species were generated for easy naming of the entire fish species in the basins. In the ichthyological collection, 43 fish species with 11 new records from the Ayima, Gelegu, and Shinfa Rivers were identified. The first two rivers in the Abbay Basin were the richest in species and number of individuals. Gelegu River had the highest abundance as well. Generally, this study was conducted in areas where no fish biodiversity studies have been undertaken, and the results obtained from this study could be important for fish biodiversity conservation.

阿利塔什国家公园的鱼类:埃塞俄比亚阿贝和特克泽盆地洪泛平原河流中鱼类的分类说明和识别钥匙
埃塞俄比亚拥有相当大的淡水潜力。目前,该国淡水生态系统中公认的鱼类多样性超过 200 种。尽管鱼类多样性如此之高,且具有可观的经济回报,但有关埃塞俄比亚河流的鱼类研究却很少。因此,本研究旨在确定和比较埃塞俄比亚阿贝盆地和 Tekeze 盆地洪泛平原河流中鱼类的多样性和分布情况。使用刺网、撒网、鱼钩、电鱼和蚊帐收集鱼类,并进行物种鉴定。刺网的拉伸网目尺寸为 4-14 厘米,网板长度为 25-75 米,每个网目尺寸的宽度为 1.5-2 米。刺网在下午(5:00)布下,次日早上(7:30)起网。捕获后,立即在现场对鱼类进行初步鉴定,并贴上适当的信息标签(如采样地点和采集日期)。在两年内(2018-2019 年)的两个旱季和两个雨季,所有采样点都采用了类似的捕捞方式。本研究还考察了阿尔法和贝塔多样性指数。为便于命名流域内的所有鱼类物种,生成了识别钥匙和物种注释清单。在收集的鱼类样本中,共鉴定出 43 种鱼类,其中 11 种为阿依玛河、格勒古河和新发河的新记录。阿巴依盆地前两条河流的物种和个体数量最为丰富。格勒古河的物种也最为丰富。总的来说,这项研究是在没有进行过鱼类生物多样性研究的地区进行的,研究结果对保护鱼类生物多样性具有重要意义。
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来源期刊
Journal of Applied Ichthyology
Journal of Applied Ichthyology 生物-海洋与淡水生物学
CiteScore
2.30
自引率
11.10%
发文量
73
审稿时长
3-8 weeks
期刊介绍: The Journal of Applied Ichthyology publishes articles of international repute on ichthyology, aquaculture, and marine fisheries; ichthyopathology and ichthyoimmunology; environmental toxicology using fishes as test organisms; basic research on fishery management; and aspects of integrated coastal zone management in relation to fisheries and aquaculture. Emphasis is placed on the application of scientific research findings, while special consideration is given to ichthyological problems occurring in developing countries. Article formats include original articles, review articles, short communications and technical reports.
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