Biodiversity of fish freshwater ecosystem

Iran wetlands are approximately 1853762ha and between Middle East wetland was contained 25 % . Shadegan Wetland in Khuzestan province is one of the 18 international wetlands registered on UNESCO's Natural Heritage List. Located 52 km from Abadan and 105 km from Ahvaz, it is Iran's largest wetland and by Linking Jarahi River connect with Persian Gulf waters, the wetland is considered one of the most wonderful natural landscape of the world because of it is unique biodiversity. In 2006, fish landings in shadegan wetland reached a peak of 3700 tons, which corresponds to more than 10 billion$ . Gill net is still the main type used in the fishing areas of the in the Shadegan wetland. Shadegan wetland, at the end of the south-western Iran '20 -º 48 to' 20-º49 degrees east longitude, and '50 -º 30 to' 00-º31 degrees north latitude is located. The land is very flat and low slope lagoon in Khuzestan plain and the Garahei River is located.