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International Journal of Aquaculture 2012, Vol.2, No.10, 65
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71
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67
Figure 2 Fulton’s condition factor (K) of
Oreochromis niloticus
(top) and
Cyprinus carpio
(bottom) in Fincha reservoir.
2.3 Length frequency distribution
A total of 645
O. niloticus
(n=87) and
Cyprinus carpio
(n=558) individuals were caught during the study
period. The total length (TL) of the fish ranged from
10 to 42 cm and 8 to 60 cm for
O. niloticus
and
Cyprinus carpio
respectively (Figure 3). The greater
proportion of the sampled fish for both species was in
the size range between 16 and 24 cm. Generally the
length frequency distribution of both species indicated
that the fish population is normal fish population with
no apparent problems of over exploitation (Figure 3).
2.4 Length at first maturity (L
50
)
The size at first sexual maturity (L
50
) for
Oreochromis
niloticus
in Fincha reservoir was 21.80 cm for female
and 24.50 cm TL for the male while L
50
was 37.50 cm
and 24.50 cm TL for female and male
Cyprinus carpio
respectively (Figure 4). Thus, female
O. niloticus
matured at smaller size than males whilst male
Cyprinus carpio
matured at smaller size than females
in Fincha reservoir.
Figure 3 Length frequency distribution of
Oreochromis
niloticus
(top) and
Cyprinus carpio
(bottom) in Fincha
reservoir.
Figure 4
L
50
of male and female
Oreochromis niloticus
(top)
and
Cyprinus carpio
(bottom) in Fincha reservoir.