International Journal of Aquaculture, 2018, Vol.8, No.14, 104-111
110
that
T. fasciata
was quite susceptible to chlorpyrifos and its mortality increased proportionally at higher doses. In
case of histopathological study, it was observed that at higher doses of chlorpyrifos 20 EC, gills of
T. fasciata
were severely affected which was responsible for the death of the fish. Therefore, indiscriminate use of
chlorpyrifos 20 EC by farmers should be discouraged particularly in an area closed to aquatic environment.
Figure 6 Photomicrograph of gills of
Trichogaster fasciata
gills after 75 days exposure to chlorpyrifos
Note: A) Control showed normal gills; B) Hemorrhage (H), hypertrophy (Hy), necrosis (N), missing of lamellae appeared when
exposed to 15 μg/L; C) Hemorrhage (H), hypertrophy (Hy), necrosis (N), missing of lamellae appeared when exposed to 150 μg/L,
H&E ×120 magnification was maintained
4 Conclusion
The research findings provided a significant understanding of the pesticidal toxicity of crop insecticide
chlorpyrifos 20 EC to the development and physiology of
T. fasciata
. It is lend a hand the policy makers to make
people conscious about the impact of insecticides used in crop production indiscriminately on normal
physiological development of fish and other aquatic organisms. The research findings are very much effective to
find a safety level of using the pesticide in crop lands in Bangladesh. Therefore, illegal use of pesticide in
agricultural land should be reduced to prevent exposure of pesticide in commercial aquatic resources.
Authors’ contributions
Mukti S.S. has conducted this research as a part of her Master of Science Degree, Ahmed G.U., Ahmed Z.F., Sumon K.A. and
Fatema M.K jointly facilitated the histopathological study
in Diseases Laboratory under the Department of Aquaculture and Aquatic
Conservation Laboratory under the Department of Fisheries Management, Bangladesh Agricultural University, Mymensingh. Fatema
M.K. and Ahmed G.U. are Supervisor and Co-Supervisor of this student, respectively. All authors read and approved the final
manuscript.
Acknowledgements
We thank all staffs of Diseases Laboratory and Aquatic Conservation Laboratory of Faculty of Fisheries, Bangladesh Agricultural
University, Mymensingh, Bangladesh for technical support.
A
B
C
