Effects of long-term chlorpyrifos exposure on mortality and reproductive tissues of Banded Gourami (Trichogaster fasciata)

• Published in: Journal of environmental science and health. Part B, Pesticides, food contaminants, and agricultural wastes Pesticides, food contaminants, and agricultural wastes, 2019-07, Vol.54 (7), p.549-559
• Main Authors: Sumon, Kizar Ahmed, Yesmin, Most. Farzana, Van den Brink, Paul J., Bosma, Roel H., Peeters, Edwin T. H. M., Rashid, Harunur
• Format: Article
• Language: English
• Subjects: Aquatic environment; Chlorpyrifos; Exposure; Fish; histopathology; Mortality; organophosphate pesticide; Pesticides; reproductive toxicity; Time dependence; Toxicity
• ISSN: 0360-1234; 1532-4109
• DOI: 10.1080/03601234.2019.1614399

This study assessed the long-term toxicity of chlorpyrifos on survival and reproduction of Banded Gourami by using mortality, gonado-somatic index (GSI) and histopathological observations as endpoints. Adult fish were exposed to five different concentrations of chlorpyrifos (0, 15, 50, 150, 500 µg/L) in 15 PVC tanks for 15, 30, 45, 60 and 75 days. Results showed that all male and female fish died after 15 days of 500 µg/L chlorpyrifos exposure. No consistent significant effect was observed for both male and female GSI. Furthermore, results showed dose- and time-dependent histopathological alterations for both ovary and testes. The 60-d No Observed Effect Concentration (NOEC) for most histopathological alterations of Banded Gourami ovary and testes was 50 μg/L, while 60-d NOEC for mortality of both male and female fish was < 15 μg/L. The results show that the long-term exposure to chlorpyrifos not only affect the reproductive tissues of Banded Gourami at exposure concentrations but also cause their mortality. Future studies should evaluate effects at lower concentrations.