Status of diversity, abundance and seasonal variations of gill net catches of cichlids in Lake Bosumtwi, Ghana

IF 1.1 4区 环境科学与生态学 Q3 MARINE & FRESHWATER BIOLOGY African Journal of Aquatic Science Pub Date : 2023-04-03 DOI:10.2989/16085914.2023.2201286
A. Asase, TL Lauridsen, P. Sanful, Eek Quansah, F. Nunoo
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Abstract

The cichlids in Lake Bosumtwi are under increasing pressure with a recent build-up in local fishing pressure. This study was conducted to assess the status and seasonal catch rates of fish species using gillnets over a two-year period. Four species and one introduced fish belonging to the Cichlidae family were encountered in the study. Coptodon discolor (Günther, 1903) was the most abundant species, making up 75.5% of the total fish caught (100.1 kg). Tilapia busumana (Günther, 1903) was the least abundant species, representing only 0.6% of biomass. Catch per unit effort was significantly affected by seasonality; however, species diversity, richness and evenness were not influenced by seasonal variations. The highest catch rates (975.62 g net−1 night−1) were recorded in the minor wet season (August to November). No statistical differences were detected in the diversity indices estimated for all three seasons of study. The key physico-chemical parameters (conductivity, salinity, temperature and pH) measured were within the tolerance range for tilapia survival and growth, with the exception of dissolved oxygen that decreased below 3 mg l−1 during the lake’s deep mixing events in August. Overall, physico-chemical factors explained 75% of fish catches, with salinity levels correlating significantly with catch per unit effort.
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加纳博苏姆特维湖慈鲷鱼网渔获量的多样性、丰度和季节变化状况
由于最近当地捕鱼压力的增加,博苏姆特维湖的慈鲷正面临越来越大的压力。本研究旨在评估两年期间刺网捕捞鱼类的状况和季节性捕捞率。在研究中发现了属于慈鲷科的4种和1种引进鱼。Coptodon discolor (g nther, 1903)品种最多,占总渔获量(100.1 kg)的75.5%。布苏马纳罗非鱼(g nther, 1903)是最不丰富的物种,仅占生物量的0.6%。每单位努力渔获量受季节的显著影响;物种多样性、丰富度和均匀度不受季节变化的影响。小湿季(8 ~ 11月)渔获率最高,为975.62 g net - 1 night - 1;在所有三个季节的研究中,多样性指数估计没有统计学差异。除溶解氧在8月湖泊深层混合期间降至3 mg l−1以下外,主要理化参数(电导率、盐度、温度和pH)均在罗非鱼生存和生长的耐受范围内。总体而言,物理化学因素解释了75%的渔获量,盐度水平与单位努力渔获量显著相关。
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来源期刊
African Journal of Aquatic Science
African Journal of Aquatic Science MARINE & FRESHWATER BIOLOGY-
CiteScore
3.90
自引率
7.10%
发文量
31
审稿时长
>12 weeks
期刊介绍: The African Journal of Aquatic Science is an international journal devoted to the study of the aquatic sciences, covering all African inland and estuarine waters. The Journal publishes peer-reviewed original scientific papers and short articles in all the aquatic science fields including limnology, hydrobiology, ecology, conservation, biomonitoring, management, water quality, ecotoxicology, biological interactions, physical properties and human impacts on African aquatic systems.
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