5. Conclusion
Results show that Tilapia is a good test organism for the study
of the effects of pesticide freshwater. The Tilapia metabolic profile
under the effect of Folidol reveals an adaptation effort to the contaminated
environment through a strategy due to the lack of oxygen
caused by a respiratory structure injury. Decreases in the
respiratory activity indicate gill lesions, caused by methyl parathion
on O. niloticus. Oxygen consumption represents a measure
of sublethal effects because energy processes are indicators of
overall physiological state. There were high percentages of cholinesterase
activity inhibition. Hematological responses indicate that
high concentrations of the pesticide may cause injury to the hematopoietic
tissue. Combining all data, including the low 96 h LC50
and the strong behavioral changes, with the fact that Folidol 600
is frequently used directly in water, it is suggested that methyl
parathion is a potentially harmful compound for fish, including
O. niloticus. Effects observed in the laboratory occur in environmentally
realistic concentrations of Folidol.