毛刷桩(katha),一种鱼聚集装置,自2003年以来,已在Shari-Goyain河中广泛使用,以聚集鱼类以更容易捕获。Katha通常在冬季水深减少时使用。因此,该实验于2018年11月至2019年3月对katha捕鱼进行,以调查其状况以及对孟加拉国Sylhet区Shari-Goyain河渔业资源的影响。该研究基于以下假设:katha捕鱼可能对鱼类生物多样性和生产产生不利影响。数据是通过问卷调查获得的,个人采访,渔获量评估(CA),焦点小组讨论,和关键线人采访。共记录了54种,在收获kathas期间,包括两种外来鱼类(罗非鱼和鲤鱼)和三种对虾。12月单位努力渔获量(CPUE)(公斤/渔具/公顷/人/小时)最高(1.13±0.37),其次是11月(1.06±0.40),1月(0.80±0.25),二月(0.71±0.23),和3月(0.52±0.21)。11月单位面积渔获量(CPUA)(kg/ha)最高(264.66±18.21),其次是12月(205.05±27.77),1月(175.02±76.04),二月(147.73±52.11),和3月(102.08±41.04)月之间观察到显着差异(p<0.05)。每个月平均渔获量为41.09±16.11至12.42±5.89公斤,平均值为24.29±11.08公斤,随着月份的增加,平均渔获量显着下降。物种丰富度最高的是在12月(38),11月(35)1月(34),二月(28)3月(25日)Siluriformes(39.123%)是最主要的顺序,其次是赛丙甲(33.95.6%),Decapoda(14.661%),和雪崩(3.278%)。根据CA和受访者的看法,katha捕鱼不分青红皂白地捕捞鱼类可能是鱼类生物多样性丧失的原因,因为它减少了开放水域的渔获量,总产量,扰乱了生态系统。从研究结果来看,建议停止katha捕鱼,以可持续管理和保护Shari-Goyain河的渔业资源。关于katha捕鱼影响的研究应在孟加拉国常见这种捕鱼的其他开放水域进行。
Brush pile (katha), a fish aggregating device, has been widely used in the Shari-Goyain River since 2003 to congregate fish for easier catch. Katha is usually used during the winter season when the water depth decreases. Hence, this experiment was conducted from November 2018 to March 2019 on katha fishing to investigate its status and impacts on fisheries resources of the Shari-Goyain River in the Sylhet district of Bangladesh. The study was based on the hypothesis that katha fishing might have detrimental impacts to fish biodiversity and production. Data were obtained through a questionnaire-based survey, personal interviews, catch assessment (CA), focus group discussions, and key informant interviews. A total of 54 species were documented, including two exotic fish species (tilapia and common carp) and 3 species of prawn during harvesting of the kathas. The catch per unit effort (CPUE) (kg/gear/ha/person/hour) was the highest in December (1.13 ± 0.37), followed by November (1.06 ± 0.40), January (0.80 ± 0.25), February (0.71 ± 0.23), and March (0.52 ± 0.21). The catch per unit area (CPUA) (kg/ha) was the highest in November (264.66 ± 18.21), followed by December (205.05 ± 27.77), January (175.02 ± 76.04), February (147.73 ± 52.11), and March (102.08 ± 41.04) where significant differences (p < 0.05) among the months were observed. Average catch per katha in a month ranged from 41.09 ± 16.11 to 12.42 ± 5.89 kg, with a mean of 24.29 ± 11.08 kg, and a significant decrease in average catch was observed with the progression of months. The most species richness was noticed in December (38), followed by November (35), January (34), February (28), and March (25). Siluriformes (39.123%) was the most dominant order, followed by Cypriniformes (33.956%), Decapoda (14.661%), and Ovalentaria (3.278%). According to the CA and respondents\' perception, indiscriminate harvesting of fish by katha fishing can be a cause of fish biodiversity loss as it reduces open water catches, total production, and disturbs the ecosystem. From the research findings, it is suggested that katha fishing should be stopped for sustainable management and conservation of fisheries resources in the Shari-Goyain River. Research on the effects of katha fishing should be conducted in other open waters of Bangladesh where this type of fishing is common.