乍得马博湖(中非)主要鱼类物种的体重-长度、总长度-标准长度因子关系以及状态因子

Abba Amba Brahim, Pierre K. Houndonogbo, I. S. Baglo, Antoine Chikou, P. Lalèyè
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引用次数: 0

摘要

尽管对马博湖生态系统的捕捞量不断增加,但对该湖鱼类群落的研究却很少。本研究旨在建立重量-长度(Pt = a Lt b)和总长度-标准长度(LT = p + q LS)关系,并确定马博湖主要物种的条件因子。为此,在2016年1月至2019年12月期间,每月从个体渔业中收集形态测量数据。使用各种渔具和技术共捕获了 25 种商业鱼类的 4891 个标本。回归系数 b 从 1.17(Hydrocynus forskali)到 4.69(Ctenopoma kingsleyae)不等。有 2 个物种呈正异速增长,2 个物种呈等速增长,21 个物种呈负异速增长。所有物种的总长度-标准长度关系均为正值且显著(r2 在 0.666 和 0.999 之间)。只有 Tetraodon lineatus 的条件系数在成熟热带淡水鱼的建议范围内。条件因子范围为 0.536±0.182 至 3.810±0.850,总平均值为 1.804±0.833。这些结果表明,马博湖的鱼类正承受着越来越大的人为压力。这些结果表明,有必要研究马博湖中开发最多的物种的种群动态。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Weight-length and total length-standard length factor relationships, and condition factor of the main fish species in Lake Maabo, Chad (Central Africa)
The fish communities of Lake Maabo are little studied despite the increasing fishing effort on this ecosystem. The present study aims to  establish weight-length (Pt = a Lt b) and total length-standard length (LT = p + q LS) relationships, and to determine the condition factor  of the main species of Lake Maabo. To this end, morphometric data were collected monthly between January 2016 and December 2019 from artisanal fisheries. A total of 4,891 specimens belonging to 25 commercial fish species were caught using various fishing gears andtechniques. The regression coefficient b ranged from 1.17 (Hydrocynus forskali) to 4.69 in (Ctenopoma kingsleyae). Two species showed positive allometric growth, 2 with isometric growth and 21 species with negative allometric growth. The total length-standard length relationship was positive and significant for all species (r2 between 0.666 and 0.999). Only Tetraodon lineatus had a condition factor within the range recommended for mature tropical freshwater fish. The condition factor ranged from 0.536±0.182 to 3.810±0.850, with an  overall mean of 1.804±0.833. These results showed that fish in Lake Maabo are under increasing anthropogenic pressure. They show the  need to study the population dynamics of the most exploited species in that Lake.
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