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Abstract
The letter included an environmental study and Hustologip for tilapia fish that live in the Green Lake Karun was concluded that the production of fish living in the region has been reduced in recent times.
Samples were collected from the lake for a year and contains the study has two main parts: -
1 - characteristics physico-chemical water lake
2 - histological study of the members selected
and through this it was concluded that fish tilapia green resistant to pollution, but affected by the contamination of the lake, which led to a lack of production and disappearance.