Abstract
Pesticides are environmental contaminants that after use in agriculture, aquatic ecosystems are entered. These contaminants can enter the food chain and can cause problems for aquatic organisms and even humans. During the acute toxicity of this herbicide paraquat on some blood parameters, Mesopotamichthys sharpeyi (the total number of red blood cells, hemoglobin concentration, and total white blood cell count, hematocrit and blood indices) in fisheries laboratories, Khorramshahr University of Marine Science and Technology were studied. The sub lethal toxicity studies of 40 fish in 4 treated on the basis of three different treatments LC50 96 h (25, 50 and 75 percent LC50 96 h), and a control treatment for 96 hours were exposed to the pesticides paraquat. 10 fish were randomly distributed into plastic containers 25 liters. Tests based on standard methods O.E.C.D were on the fish and the static. The number of red blood cells, hemoglobin concentration, percent hematocrit, white blood cell count, MCV, MCH and MCHC Mesopotamichthys sharpeyi at different concentrations after 96 h with the control treatment significantly reduced (0.05 > P) that was directly affected by different concentrations of the paraquat.
Highlights
As have been pinpointed from the obtained results, the number of white blood cells in all treatments after exposure to paraquat was lower than the control group and the significant reduction in the number of white blood cells in experimental treatments after 96 hours was observed compared with control group (P < 0.05). [32] studied acute toxicity effects of pesticide Endosulfan on blood parameters of tilapia, Oreochromis mossambicus and they reported that white blood cell count was significantly (P < 0.05) lower than the control group
This study revealed that the number of red blood cells in all treatments after exposure to paraquat was less than the control group and a significant reduction in the number of red blood cells was observed at all treatments (P < 0.05)
A significant reduction in the number of red blood cells indicates the severe anemia caused by herbicide paraquat in fish that have been exposed to the toxin
Summary
One of the main causes of pollution of aquatic ecosystems is agricultural pesticide, which is used to deal with pests, weeds and agricultural diseases and they have adverse effects on the environment [2]. Within a few weeks of using these pesticides in agricultural activities, they entered to aquatic ecosystems through surface runoff and subsurface drainage. Benni fish has gained popularity among residents of southern and southwestern of Khuzestan Province and can be considered as an important source of protein for them [7]. This species is distributed in limited areas of the world and its main habitats in Khuzestan Province are Horolazim and Shadegan wetlands. Blood characteristics of fish are one of the most important evidences of their physiological processes and reflect the relationship be-
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