Feeding Ecology and Reproductive Biology of some Economically Important Fish Species in the Tono Reservoir, Ghana
Feeding Ecology and Reproductive Biology of some Economically Important Fish Species in the Tono Reservoir, Ghana
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加纳托诺水库一些重要经济鱼类的摄食生态学和生殖生物学
DOI：
10.18052/www.scipress.com/ilns.78.23
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发表时间：
2020
影响因子：
0.3
通讯作者：
D. N. Akongyuure
中科院分区：
文献类型：
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作者：
D. N. Akongyuure
对摄食生态学和生殖生物学的研究确保采用正确的管理措施，以获得最佳的鱼类种群产量。还可以通过饲养和生殖研究来选择可供养殖的优良鱼类品种。加纳过度依赖尼罗河罗非鱼和非洲叉尾鱼的养殖，因为没有可靠的科学信息可用于养鱼的潜在鱼类种类。目前的研究试图调查加纳北部托诺水库中重要的经济鱼类物种的食物习性和繁殖特征。每月抽样时间为2015年1月至2016年12月(24个月)。使用不同网目尺寸的铸网和刺网获得试件。标本立即被运送到实验室，放在温度为4℃的冰柜中进行形态测量和肠道内容物和性腺的显微镜分析。从所有鱼类物种中鉴定出33种单独的食物。浮游植物是最重要的食物(相对重要性指数，IRI=1923)，而浮游动物是所有鱼类确定的五种主要食物中最不重要的食物(IRI=35)。雌性性腺指数(GSI)的主要高峰出现在2-3月和6-7月。预测因子(标准体长、鱼重和性腺重)可以解释胡子胡子和西花胡须鱼繁殖力变异的80%以上。所有的鱼类都被归类为杂食性动物，它们每年都会产卵一次以上，这使得它们都是水产养殖的理想候选者。管理措施应侧重于管制水库附近的农业活动和水库内的捕鱼活动，以实现可持续的鱼类生产和开发。
The study of feeding ecology and reproductive biology ensures that the right management measures are applied for best output of fish stocks. Selection of good fish species for culture is also made possible through feeding and reproductive studies. Ghana over-relies on the culture of Nile tilapia and African catfish because there is no reliable scientific information on potential fish species that can be included for fish farming. The current study sought to investigate food habits and reproductive characteristics of economically important fish species in the Tono Reservoir of Northern Ghana. Monthly sampling was carried out from January, 2015 to December, 2016 (24 months). Specimens were obtained using cast net and gillnets of varying mesh sizes. Specimens were immediately transported to the laboratory in a chilled iced chest of temperature 4 for morphometric measurements and microscopic analysis of gut content and gonads. Thirty-three (33) individual food items were identified from all the fish species. Phytoplankton was the most important diet (Index of Relative Importance, IRI = 1923) whereas zooplankton was the least important diet (IRI = 35) out of the five major categories of food items identified from all the fish species. The major peaks of gonadosomatic index (GSI) of females were noted in February – March and June – July. Over 80 % variation of fecundity was explained by the predictors (standard length, fish weight and gonad weight) for Clarias gariepinus and Auchenoglanis occidentalis. All the fish species were classified as omnivores and they spawned more than once in a year making all of them good candidates for aquaculture. Management measures should focus on regulating agricultural activities close to the reservoir and fishing activities in the reservoir for sustainable fish production and exploitation.