Growth, mortality, exploitation, and recruitment patterns of Labeobarbus altianalis (Boulenger, 1900) in River Kuja-Migori, Kenya

Authors

  • Elijah Kembenya Kenya Marine and Fisheries Research Institute (KMFRI), Kathwana, Kenya
  • Albert Getabu School of Agriculture and Natural Resources Management, Kisii University, Kisii, Kenya
  • James Njiru Kenya Marine and Fisheries Research Institute (KMFRI), P.O. Box 81651, 80100 - Mombasa, Kenya
  • Reuben Omondi School of Agriculture and Natural Resources Management, Kisii University, Kisii, Kenya

DOI:

https://doi.org/10.47193/mafis.3812025010109

Keywords:

Ripon barbel, riverine, fishery management, Lake Victoria basin

Abstract

The Ripon barbel, Labeobarbus altianalis, a riverine fish found in the Lake Victoria Basin is regarded as species of less concern, but it is vulnerable to overfishing and population decline. This study aimed at determining growth, mortality, exploitation rate, and recruitment patterns of L. altianalis (Boulenger, 1900) in River Kuja-Migori. A total of 1,217 specimens with overall total lengths ranging from 9.5-41.5 cm (mean 28.5 ± 2.7) were collected monthly from January to December 2021. The fish were caught using an electrofisher in wadable areas and monofilament nets in deeper areas. Electronic length frequency analysis (ELEFAN) software in Fish Stock Assessment Tools (FiSAT II) program was used to analyze data. Natural mortality (M) Fishing mortality (F) and total mortality (Z) coefficients were 0.15 year-1, 0.52 year-1 and 0.67 year-1 respectively. The asymptotic length (L) was 44.94 cm TL while the instantaneous growth rate (K) was 0.15 year-1. The exploitation rate was 0.44 year-1 and the length-based growth performance index (Ø’) was 3.03. Results indicated that the longevity of L. altianalis was 9 years. Recruitment occurs throughout the year with bimodal annual recruitment peaks coinciding with the two rainy seasons in the region. This study provides important information for developing management advice for the L. altianalis riverine fishery.

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Author Biographies

Elijah Kembenya, Kenya Marine and Fisheries Research Institute (KMFRI), Kathwana, Kenya

Albert Getabu, School of Agriculture and Natural Resources Management, Kisii University, Kisii, Kenya

James Njiru, Kenya Marine and Fisheries Research Institute (KMFRI), P.O. Box 81651, 80100 - Mombasa, Kenya

Reuben Omondi, School of Agriculture and Natural Resources Management, Kisii University, Kisii, Kenya

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Published

2024-11-01

How to Cite

Kembenya, E., Getabu, A., Njiru, J. and Omondi, R. (2024) “Growth, mortality, exploitation, and recruitment patterns of Labeobarbus altianalis (Boulenger, 1900) in River Kuja-Migori, Kenya”, Marine and Fishery Sciences (MAFIS), 38(1). doi: 10.47193/mafis.3812025010109.