Observations on gillnet catches of Kariba tilapia, Oreochromis mortimeri from Bumi Basin of Lake Kariba, Zimbabwe

Mhlanga, W. (1998) Observations on gillnet catches of Kariba tilapia, Oreochromis mortimeri from Bumi Basin of Lake Kariba, Zimbabwe. Naga, the ICLARM Quarterly, 21(1), pp. 57-60.

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Abstract

Gillnet catches of Oreochromis mortimeri (Trewavas) were studied in the Bumi Basin of Lake Kariba in 1988 and 1989. Total length (TL) was positively correlated with standard length (SL). The linear relationship between TL and SL was TL=1.91 + 1.22 SL (r super(2)=0.982). The relationship between SL and weight in g (W) was of the form W = 0.12 SL super(2.67). Maximum standard length (L sub(max)) was 33 cm and asymptotic length (L sub( infinity )) was 34.7 cm. Monthly ratios of male to female varied between 0.6:1 and 13:1. The mean ratio was 57.4% male: 42.6%female. Monthly condition factors varied between 3.19 and 5.11 in males, and between 3.18 and 5.14 in females. Catches were higher in 1989 compared to 1988 and possible reasons for these differences are discussed.

Item Type: Article
Title: Observations on gillnet catches of Kariba tilapia, Oreochromis mortimeri from Bumi Basin of Lake Kariba, Zimbabwe
Personal Creator/Author:
CreatorsEmail
Mhlanga, W.
Journal or Publication Title: Naga, the ICLARM Quarterly
Volume: 21
Number: 1
Page Range: pp. 57-60
Date: 1998
ISSN: 0116-290X
Issuing Agency: WorldFish Center
Uncontrolled Keywords: Gillnets; Catch/effort; Length; Length-weight relationships; Sex ratio; Lake fisheries; Kariba Lake; Zimbabwe; Oreochromis mortimeri
Subjects: Fisheries
Item ID: 9351
Depositing User: Mr William Ko
Date Deposited: 01 Dec 2012 07:08
Last Modified: 01 Dec 2012 07:08
URI: http://aquaticcommons.org/id/eprint/9351

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