Journal of Fisheries and Life Sciences

Author(s): Mohammad Sohidul Islam, Md. Mansurul Haque and Md. Hasanuzzaman

Abstract: Insecticide furadan is one of the common pollutants in aquatic environment and has become destructive for aquatic organisms. The objective of the present investigation was to observe the effects of furadan in different organs including gills, liver, heart, intestine and kidney of three indigenous fish species Channa punctatus, Heteropneustes fossilis and Anabas testudineus. Adult fishes were exposed to six different concentrations (2.5, 5.0, 10.0, 15.0, 20.0 and 25.0 mg/l) of the insecticide in the test aquaria (Clay pot `Chari’) to explore the major alterations of the vital organs for 24, 48, 72 and 96 hours of exposure period. Lower concentrations of furadan (2.5 to 10.0 mg/l) did not modify significantly on the organs of the fishes but in the concentration from 15.0 to 25.0 mg/l showed curling, necrosis, fusion of lamellae and destruction of gill arches. Rupture of blood vessels and damage of sinusoids in liver, muscle fiber fragmentation and damage of blood vessels in heart, villi were fused and renal tubules damaged in C. punctatus from different exposure time period. Fusion of secondary lamellae of gills, damage of sinusoid, vacuolated in liver and heart, fused villi and hemorrhagic renal tubules were observed in kidney of H. fossilis. Damage of lamellae in gills, blood vessels irregular in liver, muscle fibers fragmented in heart, ruptured/ fused villi and blood vessels, hemorrhage and necrotic change were noticed in kidney of A. testudineus in the same doses. The study indicates that different concentrations of insecticide damaged the important organs of the fish, even a small amount of pesticide (Furadan) in fresh water ecosystem causes harmful effects on fish physiology and consequently make death of the fishes.