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Fish populations and biomass in headwater streams of the Lake Tumba Landscape, DR Congo, 2007–2011

Mputu, Adele and Willen, Eva and Wilander, Anders and Drakare, Stina and Bishop, Kevin and Inogwabini, Bila-Isia (2022). Fish populations and biomass in headwater streams of the Lake Tumba Landscape, DR Congo, 2007–2011. Acta Ichthyologica et Piscatoria. 52 :3 , 195-208
[Research article]

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Abstract

The fish biodiversity in the Congo River and its tributaries is extremely rich but the information on fish communities in the headwaters in terms of catch and biomass estimates is rare. Fishes in the running and stagnant waters in this region are of vital importance as a food resource for local residents. This study aimed to describe the fish community, catch, and biomass in the three headwater streams Bambou, Lebomo, and Bongo in the Lake Tumba Landscape (LTL) of the Democratic Republic of the Congo. Such information is of vital impor- tance as a benchmark to understand the sustainability of the fish population for future generations of residents of the LTL. The field data were collected from 2007 through 2011, including dry and wet seasons. Here we present the results of this systematic, multi-annual study which was the first for fishes in streams of this region. In total, 50 species of 15 families were found in the nutrient-poor brown waters of these streams where high concentrations of humic acids cause a low pH. Among abundant species occurring in all three streams were the cyprinid Enteromius holotaenia (Boulenger, 1904), the mormyrid Marcusenius moorii (Günther, 1867), the alestids Clupeocharax schoutedeni Pellegrin, 1926 and Bryconaethiops boulengeri Pellegrin, 1900, and the clariid Clarias angolensis Steindachner, 1866. Bon- go Stream was distinguished from the others by a rich abundance of Alestopetersius compressus (Poll et Gosse, 1963). The presence of several species at low pH (between 5.0 and 5.5) is new information that lowers the bottom of the pH interval for these species compared to earlier reports. The maximum total length (TL) of some other species was by 5–20 percentage points higher than those reported earlier. The median weight per unit effort (WPUE) in the streams varied between 30 and 115 g per hour during the dry seasons and between 18 and 86 g per hour during the wet seasons. The fish biomass in the streams varied between 0.05 and 0.7 g ⸱ m–2 with a median 0.14 g ⸱ m–2. This relatively low value compared to other tropical headwaters may be a result of the low pH and dark color of these headwaters. The results of the study serve as a reference point to which future monitoring of fish fauna can be compared for sustainable management of the LTL

Authors/Creators:Mputu, Adele and Willen, Eva and Wilander, Anders and Drakare, Stina and Bishop, Kevin and Inogwabini, Bila-Isia
Title:Fish populations and biomass in headwater streams of the Lake Tumba Landscape, DR Congo, 2007–2011
Series Name/Journal:Acta Ichthyologica et Piscatoria
Year of publishing :2022
Volume:52
Number:3
Page range:195-208
Number of Pages:14
Associated Programs and Other Stakeholders:SLU - Environmental assessment > Programme Lakes and watercourses
ISSN:0137-1592
Language:English
Publication Type:Research article
Article category:Scientific peer reviewed
Version:Published version
Copyright:Creative Commons: Attribution 4.0
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Fish and Aquacultural Science
Keywords:acidity, catch, Congo River, fish biomass, fish species, headwaters, humic water, multi-annual data
URN:NBN:urn:nbn:se:slu:epsilon-p-118875
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-118875
Additional ID:
Type of IDID
DOI10.3897/aiep.52.77638
Scopus2-s2.0-85135462575
ID Code:28819
Faculty:NJ - Fakulteten för naturresurser och jordbruksvetenskap
Department:(NL, NJ) > Dept. of Aquatic Sciences and Assessment
Deposited By: SLUpub Connector
Deposited On:12 Sep 2022 09:25
Metadata Last Modified:12 Sep 2022 09:31

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