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A rapid fishery assessment to collect biological information and life-history parameters for rednose labeo Labeo rosae and Mozambique tilapia Oreochromis mossambicus in Loskop Dam, Olifants River, South Africa

Published in: African Journal of Aquatic Science
Volume 49 , issue 3 , 2024 , pages: 275–281

DOI: 10.2989/16085914.2024.2390931

Author(s): HA Hlungwani University of Limpopo, South Africa , SM Marr University of Limpopo, South Africa , OLF Weyl South African Institute for Aquatic Biodiversity (SAIAB), South Africa , AC Hoffman , South Africa , H Botha University of Limpopo, South Africa , JR Sara University of Limpopo, South Africa

Keywords: female sexual maturity , impoundment fisheries , inland fish , length at age , length–weight relationship , mortality , native fish

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Abstract

A 2-week rapid fishery assessment using various sampling gears was conducted to collect life-history data on rednose labeo Labeo rosae and Mozambique tilapia Oreochromis mossambicus in Loskop Dam on the Olifants River, Mpumalanga Province, South Africa. These native species were the two most-abundant fish species caught in the impoundment during the study. Both species displayed a bimodal population size distribution comprised of recent recruits and large-sized individuals. Isometric growth (b value ∼3), an asymptotic length (L _∞) of 447 mm, and length at 50% sexual maturity (L _m50) of 198 mm were estimated for L. rosae. Isometric growth, L _∞ of 451 mm, and L _m50 of 124 mm were estimated for O. mossambicus. This rapid assessment at Loskop Dam produced sets of life-history parameters comparable to those previously reported for these two species in Flag Boshielo Dam, ∼80 km downstream.

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