在津巴布韦最大的内陆水库Tugwi Mukosi中,成熟时的大小、成熟期和小鳞虾的性别比例(lacep, 1802年):基线研究

IF 1 Q4 FISHERIES
Terence Magqina, Alfred Mhere
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引用次数: 0

摘要

成熟期大小、性别比和成熟期是关键的种群参数,对已开发种群的渔业管理很重要,因为它们影响鱼类种群的生存。引进的大口黑鲈Micropterus salmoides成功地在非洲南部的淡水水体中定居。在津巴布韦最大的水库Tugwi Mukosi大坝,大口黑鲈是一种重要的鱼类,因为它为当地社区提供了旅游业、食物和收入。本研究对图格维穆克西大坝沙纹沙螨种群参数进行了调查。研究发现,雄性和雌性的50%性成熟(L50)值分别为204 mm和261 mm。雌性大口黑鲈的logistic方程为M(L) = 1 / [1 + exp (-0.256L + 6.402)]。对于雄性大口黑鲈,logistic方程为M(L) = 1 / [1 + exp (-0.1375L + 4.129)]。结果表明,繁殖活动在10月份达到高峰。男女比例为1:1.04,属于典型的健康人群。需要对大口黑鲈的种群参数进行更多的研究和监测,以便能够预测过度开发的长期影响,并使负责任的当局能够保护鱼类种群免于崩溃。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Size at maturity, maturity stages, and sex ratio of Micropterus salmoides (Lacepède, 1802) in Zimbabwe’s largest inland reservoir, Tugwi Mukosi: a baseline study
Size at maturity, sex ratio and maturity stages are key population parameters that are important in fisheries management of exploited stocks as they influence survival of fish populations. The introduced largemouth bass Micropterus salmoides has successfully colonised freshwater bodies in southern Africa. In Tugwi Mukosi Dam, Zimbabwe’s largest reservoir, largemouth bass is a fish of importance as it provides tourism, food and income for the local communities. This study investigated population parameters of M. salmoides in Tugwi Mukosi Dam. The study revealed that the size at 50% sexual maturity (L50) value for male and female was 204 mm and 261 mm respectively. The logistic equation for female largemouth bass was M(L) = 1 / [1 + exp (–0.256L + 6.402)]. For male largemouth bass the logistic equation was M(L) = 1 / [1 + exp (–0.1375L + 4.129)]. The results showed that reproductive activity peaked in October. The male to female ratio was 1:1.04 which is typical of healthy populations. More research and monitoring of the population parameters of largemouth bass is needed so as to be able to predict long term effects of overexploitation and enable responsible authorities to protect the fish stock from collapsing.
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