Bashar Abul, Rohani Md Fazle, Uddin Md Rois, Hossain Md Sazzad
Department of Aquaculture, Bangladesh Agricultural University, Mymensingh, 2202, Bangladesh.
Department of Geography and Environmental Science, Ananda Mohan College, Mymensingh, 2200, Bangladesh.
Heliyon. 2020 Nov 7;6(11):e05447. doi: 10.1016/j.heliyon.2020.e05447. eCollection 2020 Nov.
The study was carried out to obtain information on the present status and trend of finfish diversity of the Old Brahmaputra river, Bangladesh. Samples were collected directly from a professional fishing boat caught by different nets, traps and hooks from January 2019 to December 2019. Together with 4 exotic species, a total of 49 species under 6 families were recorded. Though a biodiversity index of 3.65854 and a dominance index of 0.030929 represent the richness of ichthyo-diversity within the river, Synbranchiformes and Tetraodontiformes were not reported throughout the study period. Linear regression analysis showed a positive correlation between water height of the river and monthly abundance of the species found. Catch composition of catfishes and snakeheads slumped while barbs showed triumph over previous findings. A majority of fish recorded were within the least concern category according to IUCN (2015) but portions also belonged to critically endangered, endangered, and vulnerable categories as well. Therefore, conservation measures must be infixed in the Old Brahmaputra river to hold the fish diversity in a sustainable state.
开展这项研究是为了获取有关孟加拉国老布拉马普特拉河有鳍鱼类多样性的现状和趋势的信息。2019年1月至2019年12月期间，样本直接从一艘专业渔船上采集，该渔船使用不同的网、陷阱和鱼钩捕鱼。连同4种外来物种在内，共记录了6个科的49种鱼类。尽管生物多样性指数为3.65854，优势度指数为0.030929，表明该河流内鱼类多样性丰富，但在整个研究期间未报告合鳃目和鲀形目鱼类。线性回归分析表明，河流的水位与所发现物种的月丰度之间呈正相关。鲶鱼和乌鳢的渔获组成下降，而倒刺鲃的渔获情况比之前的研究结果要好。根据世界自然保护联盟（2015年）的标准，记录的大多数鱼类属于最不受关注的类别，但也有部分属于极度濒危、濒危和易危类别。因此，必须在老布拉马普特拉河实施保护措施，以维持鱼类多样性的可持续状态。
