Investor Presentaiton
International Journal of Biological Sciences and Applications 2015; 2(4): 33-36
35
3. Results
The overall monthly condition factor values in the
respective abundance of the Tilapia zilli, Oreochromis
niloticus, Oreochromis mossabicus and Oreochromis aureus
in Ebonyi River showed that the highest K value (5.0) was in
the month of June in T. zilli while the lowest K (0.2) value
occurred in January, March and April in O. aureus, T. zilli and
O. niloticus (Table 1). Condition factor values in relation to
the sex of the four species of Tilapia revealed that male
samples had highest K value of 5.0 and lowest K value of 0.4
while the mean K values were 2.4, 2.2, 2.1 and 2.2 for T. zilli,
O. niloticus, O. aureus and O. mossabicus respectively.
Female samples had highest K value of 3.5 and lowest K value
of 0.2 while the mean K values were 1.7, 1.6, 1.6 and 1.7 for T.
zilli, O. niloticus, O. aureus and O. mossabicus respectively
(Table 2).
Table 1. Monthly condition factor of the four Tilapia species.
T. zilli
O. niloticus
O. mossabicus
O. aureus
Months/Species
Hy
Lv
My
Hy
Ly
My
Hv
Lv
My
Hv
Lv
My
January 2011
2.5
0.5
1.6
2.6
0.6
1.4
2.6
0.6
1.4
2.7
0.2
1.5
February 2011
3.0
0.4
1.8
2.8
0.6
2.0
2.9
0.4
1.5
3.0
0.3
2.1
March 2011
3.5
0.2
1.5
3.2
0.5
1.8
3.0
0.5
1.8
2.9
0.4
1.8
April 2011
3.7
0.4
1.7
3.2
0.2
1.6
3.0
0.4
2.0
3.0
0.6
2.0
May 2011
4.0
1.0
2.2
3.9
0.5
1.9
3.5
0.9
1.7
4.0
1.2
2.6
June 2011
5.0
0.6
2.3
4.5
0.6
2.7
4.8
0.6
2.3
4.6
0.6
2.5
Overall K value
5.0
0.2
2.1
4.5
0.2
1.9
4.8
0.4
1.9
4.6
0.2
2.0
Hv
Highest value
Lv = Lowest value
My
Mean value
Table 2. Condition factor value in relation to the sex of the four species of Tilapia.
Sample
Male
Female
Species/Sex
size
Hv
Lv
My
Hv
Ly
Mv
T. zilli
80
5.0
0.4
2.4
3.5
0.2
1.7
O. niloticus
80
4.5
0.8
2.2
3.2
0.2
1.6
O. mossabicus
80
4.6
0.5
2.1
3.0
0.2
1.6
O. aureus
80
4.8
0.8
2.2
3.5
0.4
1.7
Hv
Highest value
Lv = Lowest value
My
Mean value
4. Discussion
A total of three hundred and twenty (320) tilapia species
that composed of eighty (80) each of Tilapia zilli,
Oreochromis niloticous, O. aureus and O. mossabicus which
are in the family of cichlid were collected during the study
period (January-June, 2011). Monthly mean K values of all
the four species indicate that these populations in Ebonyi
River were in good condition as K value was greater than 1.
Condition factor values in relation to the sex of the four
species of Tilapia indicated that males had higher condition
factor values than females; thus male samples were in a better
state of wellbeing than the females which is in agreement with
the findings of Mahomound et al. (2011). With respect to
highest and lowest k values among these species populations,
lowest values revealed K as being below one, indicating poor
condition of some samples within the populations. The result
obtained on O. niloticous, is below K values recorded from the
works of Haruna and Bala (2006). It is above the result obtain
in the work of Olurin and Adeighe (2006) although it is below
that of Bagenal and Tesch (1978) which indicated a range of
2.9-4.8 as the ideal range of K value for the normal growth and
utilization of nutrients by a normal fresh water fish. T. zilli
showed a relatively more improved performance in terms of
growth in which maximum K value of 5.0 but it is
comparatively lower than the K value obtained from the
studies of Haruna and Bala (2006). The K value comfortably
fall within the ideal set of Bagenal and Tesch (1978) and
Uneke (2013) but the result of T. zilli was lower than that of
Anene (2005). O. mossabicus K values fell barely within the
range obtained in the work of Haruna and Bala (2006). The
maximum K factor of O. mossabicus and O. aureus in the
current study was within the range recommended by Bagenal
and Tesch (1978). In this study efficient sampling was carried
out to include the widest possible range of lengths, which are
generally obtained using non-selective fishing techniques the
variation in specimens to fully sample matured specimens. In
conclusion, mean K values recorded in this study indicate four
thriving cichlid populations in good condition in which their
sustainable management should not be neglected.View entire presentation