Please use this identifier to cite or link to this item: http://hdl.handle.net/123456789/217
Title: POPULATION DYNAMICS OF THE AFRICAN RIVER PRAWN, MACROBRACHIUM VOLLENHOVENII, IN DAWHENYA IMPOUNDMENT
Authors: Alhassan, E. H.
Armah, A. K.
Keywords: growth
mortality
exploitation
recruitment
Issue Date: 2011
Publisher: Turkish Journal of Fisheries and Aquatic Sciences
Series/Report no.: 11;
Abstract: Studies were conducted on the growth and mortality parameters, recruitment pattern, probability of capture, yield-per recruit, and present rate of exploitation of the African river prawn, Macrobrachium vollenhovenii from Dawhenya impoundment, Ghana. Estimation of the von Bertalanffy growth parameters gave; L∞ = 14.2 cm, K = 1.0 yr-1, and to = -0.195 yr-1 with the growth performance index, Ф' of 2.303. From the linearised length-converted catch curve, total mortality, Z was 5.36 yr-1. Natural mortality, M calculated from Pauly’s empirical formula was 2.20 yr-1 and fishing mortality, F calculated from Z - M was 3.16 yr-1. From the mortality estimations, the present rate of exploitation, E calculated from F/Z was 0.59 indicating that, the species is on the verge of being over-exploited in the impoundment. Using the estimated value of the growth coefficient, K, the longevity was found to be about 3 yrs. Estimations from the probability of capture routines gave the length-at-first capture, Lc as 3.07 cm while the size distribution of the catches suggest two recruitment pulses in a year. It is therefore recommended that, the property right-based system for fisheries management should be implemented so that fishermen can cooperate in the management of the Macrobrachium fishery.
URI: http://hdl.handle.net/123456789/217
ISSN: 1303-2712
Appears in Collections:Faculty of Natural Resource and Environment



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