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|Title:||Population dynamics of Nile Tilapia (Oreochromis niloticus) at Chashma Barrage, Pakistan|
|Keywords:||Growth;Mortality;Population dynamics;Oreochromis niloticus;Pakistan|
|Abstract:||Growth and mortality parameters of Oreochromis niloticus, 480 samples collected through four research trawls during the months of April, May, June and July of 2014, were evaluated by using FiSAT-II computer package. Length-weight parameters were found to be as W = 0.001 * L 2.144 (R2 = 0.939), where W, L and R2 represents weight, length and coefficient of determination. Computed von Bertalanffy growth functions, ELEFAN method, were L∞ (asymptotic length) = 227.85 mm (FL) and K (growth coefficient) = 0.070 year-1 respectively. Estimated value of t0 (hypothetical length at which age is zero) remained -0.158 year-1 whereas Rn (goodness of fit) was 0.182. Z (annual mortality rate) was evaluated as 1.11 with its 95% confidence interval at (0.74 – 1.49) and M (natural mortality) was 0.16. The value of fishing mortality (F) and exploitation ratio (E) was 0.95 year-1 and 0.85 year-1 correspondingly. Fmax, F0.1 and Fcurrent were evaluated as 0.2 year-1, 0.15 year-1 and 0.15 year-1 correspondingly. Φ (growth performance index) was computed as 3.560. Current study suggests that the capture of this fishery resource should not exceed from current catch level.|
|ISSN:||0975-1033 (Online); 0379-5136 (Print)|
|Appears in Collections:||IJMS Vol.46(01) [January 2017]|
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