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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.
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