European Journal of Scientific Research - EuroJournals

809 F.R. Falayi, A.S. Ogunlowo and M.O. Alatise
Variation in the turbidity level in the ponds
The turbidity level in the various pond water throughout the period of the experiment is as shown in
Fig.3. The turbidity of the pond water increased through out the experiment. Highest value of turbidity
was recorded in pond3, followed by pond2 and pond1. The least value of turbidity was recorded in
control pond. This trend must have been as a result of the increased quantity of droppings into the
ponds. A linear relationship was established between turbidity of water in the ponds against the number
of weeks after stocking which showed a high correlation of 0.99. (R2 =0.99) as shown in Fig. 3.
Figure 3: Variations in the Turbidity against weeks after stocking
Variation in dissolved oxygen level in the ponds
The total dissolved oxygen (DO) in the various ponds throughout the experiment is as shown in Fig.4.
The value decreased significantly towards the end of the experiment in all the ponds. This development
might be as result of increase in the weight of the fish bringing about an increase in the quantity of
droppings from the birds. The poultry droppings is an organic material which has high BOD and
capable of utilising the oxygen in the water. Dissolved oxygen depletion was highest in pond3
followed by pond2 and pond1 and least oxygen depletion was recorded in control pond. When
compared with the tolerable (DO) standard level, the values of dissolved oxygen in ponds 1 and 2 were
within the limit suitable for fish culture but the DO level recorded in pond3 towards the end of the
experiment was below the standard required for effective catfish production and must have been
responsible for the retarded growth of fish in the pond.
Figure 4: Variations in the Dissolved oxygen in the water against weeks after stocking