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首页> 外文期刊>Lakes & reservoirs: Research and management >Assessment of catfish (Clarias gariepinus) stock in LakeBaringo, Kenya
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Assessment of catfish (Clarias gariepinus) stock in LakeBaringo, Kenya

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The management measures used for sustainable utilization of Clarias gariepinus in Lake Baringo do not have a stockassessment reference, attributable mainly to a lack of information on biological limits and target reference points. Assessmentof Clarias gariepinus stock in Lake Baringo was carried out between August 2013 and July 2014. A total of 2772 fishwere sampled from 25 boats (40) for 5 days each week for length and weight measurements. Fish Stock AssessmentTools and yield model were used to estimate population parameters, exploitation rate and optimal fishing scenarios.Annual C. gariepinus standing biomass was estimated at 21 383 kg, L_∞ = 114.30, K = 0.37 year~(-1), W = 0.0147L~(2.81),Z = 1.14 year~(-1), M = 0.61 year~(-1), F = 0.53 year~(-1), and exploitation rate = 0.46 year~(-1). The relative yield-per-recruit (Y0/R) and biomass-per-recruit (B′/R) resulted in E_(max) = 0.44 and F_(MSY)= 0.50 year~(-1). The yield-per-recruit ratio at maximumsustainable yield was 29.12, and the SSBMSY per recruit ratio = 56.10. The steady-state biomass, exploitation rate andoptimal fishing scenario indicated a pristine fishery for the lake, suggesting the current fishing efforts should not beexceeded to enable sustainable economic utilization of C. gariepinus.
机译：用于可持续利用巴林戈湖大鲷的管理措施没有种群评估参考，主要原因是缺乏关于生物限度和目标参考点的信息。2013 年 8 月至 2014 年 7 月期间对巴林戈湖的 Clarias gariepinus 种群进行了评估。每周从25艘船（40%）抽取2772条鱼，为期5天，进行长度和重量测量。利用鱼类种群评估工具和产量模型，估算种群参数、捕捞率和最佳捕捞情景。年生灰桦树立生物量估计为21 383 kg，L_∞=114.30，K=0.37年~（-1），W=0.0147L~（2.81），Z=1.14年~（-1），M=0.61年~（-1），F=0.53年~（-1），开发率=0.46年~（-1）。相对单量产量（Y0/R）和生物量（B′/R）为E_（max）=0.44，F_（MSY）=0.50年~（-1）。最大可持续产量下的单兵产量比为29.12%，SSBMSY每新兵比=56.10%。稳态生物量、开采率和最佳捕捞方案表明，该湖的渔业处于原始状态，表明不应超过目前的捕捞努力，以实现对加里松的可持续经济利用。

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