Morphometric characteristics of four important fish species from the Rwandan side of Lake Kivu

A. Nsabimana, Wellars Banzi, Valens Habimana, Colores Uwamariya, D. Mutangana
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Abstract

Inland fisheries are important socio-economic resources for rural communities in Africa. In Rwanda, about two million people directly depend on capture fisheries from Lake Kivu. Sustainable fisheries management requires monitoring of population dynamics that help devise effective intervention strategies. However, the relevant data such as length-length and length-weight relationships do not exist for most of the key species in Lake Kivu. The present study generated morphometric and body weight data for Limnothrissa miodon (n=82), Lamprichthys tanganicanus (n=55), Haplochromis vittatus (n=51) and Haplochromis graueri (n=34) from Lake Kivu. Length-weight relationships (W=aLb) were highly significant for all species (p < 0.0001), high adjusted R2 = 78 to 98% of the variance in weight explained by total length. Negative allometric length-weight relationships were found with regression slope (b) values of 2.7 for Limnothrissa miodon, 2.8 for H. graueri, and 2.8 for L. tanganicanus, and positive (b=3.4) for Haplochromis vittatus. Length-length relationships were highly significant for all species (p ≤ 0.0001), except for the relationship between total and caudal length for L. miodon, and total and caudal peduncle length for L. tanganicanus, both not significant at p > 0.05. The highest R2 was for the relationships between total and standard length for H. vittatus, and total and fork length for L. tanganicanus. No description of length-length relationships exists for these species in literature or in FishBase database. The data generated in the current study will be used to assess changes in fish populations over time.
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基伍湖卢旺达一侧四种重要鱼类的形态特征
内陆渔业是非洲农村社区重要的社会经济资源。在卢旺达,大约有200万人直接依靠基伍湖的捕捞渔业为生。可持续渔业管理需要监测种群动态,以帮助制定有效的干预战略。然而,基伍湖大多数关键物种的长度-长度和长度-重量关系等相关数据不存在。本研究对基武湖的Limnothrissa miodon (n=82)、Lamprichthys tanganicanus (n=55)、Haplochromis vittatus (n=51)和Haplochromis graueri (n=34)进行了形态计量学和体重数据分析。长度-权重关系(W=aLb)在所有物种中都非常显著(p < 0.0001),高度调整后的R2 = 78%至98%的重量方差可以用总长度来解释。异速生长长度-重量呈负相关,Limnothrissa miodon、H. graueri和L. tanganicanus的回归斜率(b)分别为2.7、2.8和2.8,而Haplochromis vittatus呈正相关(b=3.4)。除L. miodon和L. tanganicanus的总柄长和尾柄长之间的关系均不显著(p > 0.05)外,其余种属的长度-长度关系均极显著(p≤0.0001)。其中,维塔atus的总长度与标准长度、tanganicanus的总长度与叉长关系R2最高。在文献和FishBase数据库中都没有对这些物种的长度关系的描述。目前研究中产生的数据将用于评估鱼类种群随时间的变化。
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