Predictions of fish yields and the status of the Kainji Lake fishery, 1998

du-Feu, T.A. and Abiodun, J. (1999) Predictions of fish yields and the status of the Kainji Lake fishery, 1998. New Bussa, Nigeria, Nigerian-German (GTZ) Kainji Lake Fisheries Promotion Project, (Nigerian-German Kainji Lake Fisheries Promotion Project Technical Report Series, 16) (ISBN: 978-037-015-3; ISSN:1119-1449).

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Abstract

Length frequency data was collected for the 6 main species from the Kainji Lake fishery for up to 16 months. Growth parameters were estimated and used for virtual - population and length based cohort analysis. The results from cohort analysis suggest that before the ban on beach seines the maximum economic yield from the fishery was overshot by 70%. Yield per recruit analysis showed that the fish are caught far below their optimum size. Fishing gears and the timing responsible for this early mortality have been identified. After the eradication of seines from the lake a 10% increase in total catch revenue can be expected from the fishery. This is equivalent to an increase in income of Naira 18,300 per annum for each fishing entrepreneur using other methods. A scenario for the regulation of cast net mesh size together with the ban of beach seines has been presented. A further increase of Naira 142 million (N25,500 per entrepreneur) can be anticipated if this is implemented by the Kainji Lake Fisheries Management and Conservation Unit. It is expected that the annual increase in fishing effort presently experienced will cause future yields to decline. The rate of the decline has been reduced by the eradication of the beach seine fishery and will further fall if the minimum mesh size for cast nets is implemented. A recommendation is made to the Kainji Lake Fisheries Management and Conservation Unit to first consolidate the beach seine ban and then to implement a ban of undersized cast nets. (PDF contains 70 pages)

Item Type: Monograph or Serial Issue
Title: Predictions of fish yields and the status of the Kainji Lake fishery, 1998
Personal Creator/Author:
CreatorsEmail
du-Feu, T.A.
Abiodun, J.
Series Name: Nigerian-German Kainji Lake Fisheries Promotion Project Technical Report Series
Number: 16
Date: 1999
Publisher: Nigerian-German (GTZ) Kainji Lake Fisheries Promotion Project
Place of Publication: New Bussa, Nigeria
Projects: Nigerian-German (GTZ) Kainji Lake Fisheries Promotion Project
Issuing Agency: Deutsche Gesellschaft für Technische Zusammenarbeit (Nigeria Office)
Uncontrolled Keywords: Nigeria, Lake Kainji; fishery data; fishery management; fishing effort; freshwater lakes; inland fisheries; inland waters; stock assessment; Chrysichthys nigrodigitatus; Citharinus citharus citharus; Lates niloticus; Oreochromis niloticus niloticus; Sarotherodon galilaeus galilaeus; Synodontis membranaceus
Subjects: Management
Fisheries

Biology
Item ID: 3853
Depositing User: Ms Maria Kalentsits
Date Deposited: 11 Aug 2010 09:58
Last Modified: 29 Sep 2011 16:45
URI: http://aquaticcommons.org/id/eprint/3853

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