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Abstract:Malathion is an organophosphorous insecticide widely used in the agricultural field in Bangladesh and reach in the aquatic environment through rain wash. In the present study, we examined the effects of Malathion on hematological parameters and gills morphology in common carp exposed to two sub-lethal concentrations (1.5 and 3.0 mg/L) for a period of 192h (8 days). For hematological parameters fish were sacrificed at 24, 48, 72, and 96h after start of exposure. Gills were collected at 192h after start of exposure. The blood glucose level was significantly elevated with increasing the concentration of Malathion. Red blood cells (RBCs), hemoglobin (Hb) and hematocrit (Hct) values were significantly decreased after the exposure of Malathion. Significant increments were observed in case of the mean corpuscular volume (MCV) and mean corpuscular hemoglobin concentration (MCHC), while no distinct changes were noted for mean corpuscular hemoglobin (MCH). Interestingly, white blood cells (WBCs) count was significantly increased with toxicity of Malathion. Several morphological changes, such as telangiectasia, blood lamellar congestion, hypertrophy of filaments, lamellar fusion were observed in the gills of fish exposed to Malathion. The present study revealed that the insecticide had adverse effects on various blood parameters and gills morphology in common carp. Thus, the use of insecticide in the agriculture field may be a threat to fauna and flora of the aquatic environment.

This experiment was conducted to evaluate the egg production performance in zebrafish (Danio rerio) in different pH treatments. Zebrafish were reared continuously 15 days in 3 different pH treatments like control (pH 6.8-7.4), acidic (pH 5.0-6.0) and basic (pH 9.0-10.0) media and then eggs were collected from them. Numbers of egg collection from the acidic and basic media were significantly varied from the control. Collected eggs from acidic, basic and control media were then incubated at different pH treatments ranging from pH 2.0-12.0. Significant differences were observed in hatching rate and time in control medium from two other different treatments.Progressive Agriculture 26:85-89, 2015

Sumithion is extensively used in the agricultural land to control brittle and larval rearing aquaculture ponds to control tiger bug. The present study was conducted to evaluate the effects of sumithion on blood glucose and hemoglobin levels in zebrafish, Danio rerio. At first acute toxicity (96 h LC50 value 7.89 mg/L) of sumithion was determined for sexually matured zebrafish. Then the fish were exposed to four concentrations (0, 0.5, 1.0 and 2.0 mg/L) of sumithion for a period of 7 days. The sexual dimorphic changes in blood glucose levels were observed in the present study. In male, the blood glucose levels were significantly (P<0.05) increased in all concentrations (0.5, 1.0 and 2.0 mg/L) of sumithion compared to control (0 mg/L), while in female the blood glucose levels were significantly (P<0.05) increased only in high concentration (2.0 mg/L). Interestingly, the blood glucose level was higher in females than the males of zebrafish. The recorded hemoglobin values were significantly decreased with the increasing concentration of sumithion in both male and female. The present investigation revealed the toxic potentiality of sumithion on the zebrafish.Progressive Agriculture 27 (2): 216-221, 2016

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