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Table 2.

Total mortality (Z yr− 1), natural mortality (M yr− 1), fishing mortality (F yr− 1) coefficient, exploitation rate (E) and probability of capture and sizes (cm) at which 25, 50 and 75% of the encountered O. niloticus were retained by commercial gears from Nyanza Gulf of Lake Victoria.

Station Z M F E L25 L50 L75 
Dunga 2.06 0.97 1.09 0.53 35.80 38.21 40.19 
Kendu Bay 1.77 0.95 0.82 0.46 32.35 35.74 38.30 
Asembo Bay 2.02 0.99 1.03 0.51 28.74 31.45 31.31 
Homa Bay 2.81 1.10 1.71 0.61 5.17 13.25 15.31 
Luanda Gembe 1.93 0.97 0.96 0.32 2.74 12.24 15.38 
Mean 2.12 1.00 1.12 0.48 20.96 26.18 28.54 
± SD ± 0.40 ± 0.06 ± 0.34 ± 0.11 ± 15.75 ± 12.50 ± 12.19 
Station Z M F E L25 L50 L75 
Dunga 2.06 0.97 1.09 0.53 35.80 38.21 40.19 
Kendu Bay 1.77 0.95 0.82 0.46 32.35 35.74 38.30 
Asembo Bay 2.02 0.99 1.03 0.51 28.74 31.45 31.31 
Homa Bay 2.81 1.10 1.71 0.61 5.17 13.25 15.31 
Luanda Gembe 1.93 0.97 0.96 0.32 2.74 12.24 15.38 
Mean 2.12 1.00 1.12 0.48 20.96 26.18 28.54 
± SD ± 0.40 ± 0.06 ± 0.34 ± 0.11 ± 15.75 ± 12.50 ± 12.19 
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