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Tobias Musschoot
Biology
Vertebrates
Vertebrates
Publication details
Olaosebikan, B.D., Musschoot, T & Umar, Y. 2006. ‘Growth, mortality and yield of Parailia pellucida (Siluriformes: Schilbeidae) in the upper portion of Jebba Reservoir, Nigeria’.
Article in a scientific Journal / Article in a Journal
Abstract:
The growth, mortality and yield estimates of the schilbeid catfish, Parailia pellucida (Boulenger), in Jebba Reservoir, Nigeria, were obtained from monthly length frequency data of 12136 specimens collected between November 2003 and October 2004. The von Bertalanfy growth function (VBGF) estimates were: L= 129.21 mm forked length; K= 1.810/year. The growth performance index was 4.48. The natural mortality rate (M) was 1.71/year, total mortality rate (Z) 6.54/year and the exploitation ratio (E=F/Z) 0.737. Length at first capture was 20 mm FL and maximum length caught was 117 mm FL. Parailia pellucida recruits into the fishery throughout the year with an extended pulse from September to March corresponding to the period of the two flood regimes of the lake. The estimated longevity was 1.65years. From the Beverton and Holt relative yield per recruit analysis via Knife-edge procedure, were Emax= 0.457, E0.1=0.357 and E0.5= 0.294 while via Selection Ogive were Emax= 0.457, E0.1=0.407 and E0.5 = 0.192. The fishery is supported by two sub-stocks, the Lake Kainji stock occurring upstream and those of Jebba Reservoir. The management proposed is that more fishers should exploit the population in the middle and lower portion of the Lake.
Keywords: growth; mortality; Parailia pellucida; yield; Jebba Reservoir.