Toxicity bioassay of chlorpyrifos on some local fish species of northern Bangladesh

Akmm Hossain,Mj Islam,T Mahajebin,Ms Rahman,Mn Zahan

doi:10.3329/ijarit.v9i1.42948

Abstract

Four fish species namely, stinging catfish (Heteropneustes fossilis), spotted snakehead (Channa punctatus), climbing perch (Anabas testudineus) and tangra (Batasio tengana) were exposed to various concentrations of chlorpyrifos (Expert 20 EC) to investigate the mortality rate of fish species and the toxicity level of the pesticide. The LC50 values of chlorpyrifos on these fish species were 23.10, 20.32, 16.61 and 13.94 ppm, respectively at 96 hours of exposure. Among these results, it is clear that the lethal concentration is varying species to species because their strengths are different. During the experiments, some water quality parameters such as temperature, pH, dissolved oxygen, total dissolved solids and electrical conductivity were also analyzed. The temperature values remained within the ranges of 17-20°C and the pH was 6.64-7.30. Fish behaved irregular and erratic movements followed by hyper excitability, loss of balance and settling to the bottom of the test chamber. At higher concentration of chlorpyrifos, alterations in physiological and behavioural responses especially erratic swimming, gulping, mucus secretion, increased opercular movement and profuse emission of mucus all above the body were observed during the primary stages of contact after which it became occasional. Int. J. Agril. Res. Innov. & Tech. 9 (1): 42-47, June, 2019

Highlights

Application of organophosphorus insecticides in crop field has a great impact on aquatic system especially on fish population
Many authors studied the impact of organophosphorous insecticides on different fish species such as malathion on freshwater fish Labeo rohita (Thenmozhi et al, 2011), Barbodes gonionotus (Hoque et al, 2000), Cyprinus carpio (Sharmin et al, 2014), chlorpyrifos and carbandazim on Chanos chanos (Palanikumar et al, 2014), and chlorpyrifos on Channa gachua (Kadam and Patil, 2016)
Freshwater fishes such as H. fossilis, C. punctatus, A. testudineus, and B. tengana were collected from the local market of Dinajpur, Bangladesh and brought to the laboratory

Summary

Introduction

Application of organophosphorus insecticides in crop field has a great impact on aquatic system especially on fish population. In spite of terrible impact of pesticide on aquatic environment, it is vastly used in agricultural sector (Kadam and Patil, 2016). These pesticides are mixed with aquatic ecosystem by different ways such as rainfall, overflow of water bodies, drainage system etc. Are the main causes of declining the fish population (Siddiqa et al, 2016). Among the different causes of fish decrease, use of pesticide is one of the important issues. Many authors studied the impact of organophosphorous insecticides on different fish species such as malathion on freshwater fish Labeo rohita (Thenmozhi et al, 2011), Barbodes gonionotus (Hoque et al, 2000), Cyprinus carpio (Sharmin et al, 2014), chlorpyrifos and carbandazim on Chanos chanos (Palanikumar et al, 2014), and chlorpyrifos on Channa gachua (Kadam and Patil, 2016)

Methods

Results

Conclusion