Abstract
River prawn in Nigeria sustains viable commercial fisheries, which, however, are poorly studied. In this study we evaluated the migrant prawn fishery in the Asu River and the relevance of length-frequency data to the estimation of Macrobrachium vollenhovenii population dynamics using the data collected monthly from January 2007 to December 2008. The length-frequency data were analysed using the FAO-ICLARM stock assessment tool. Over 80% of captured prawns were M. vollenhovenii with peak catches attained in July. Growth parameters of L∞ = 23.65 cm, K = 1.14 year-1 and (t0) = -1.45, were estimated. The estimated longevity of 2.10 years and the growth performance index (Φ') of 2.80 compared favourably with the available information on the species, authenticating reliability of our results. The instantaneous rate of total mortality estimated from the length-converted catch curve was 6.47 years-1. Natural and fishing mortality were 2.14 years-1 and 4.33 years-1 respectively, which yielded the exploitation rate...
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