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This research was carried out in order to investigate the limnological studies of Maron and Khairabad rivers in Kohgiluyeh and Boyerahmad province in order to assess the feasibility of breeding warm water fish. This study, by determining the sampling and hydrometric stations in the catchment area of Khairabad and Maroon rivers in Kohgiluyeh and Gachsaran cities, after sampling the water and sediments of the river, analyzing the water samples including (physical and chemical parameters of water, pH , hardness, nitrate, nitrite, phosphate, BOD, COD, dissolved solids, dissolved oxygen, salinity, electrical conductivity and temperature) and identification and counting of benthic samples were done in the laboratory. According to the results and the relationship between BOD and the Z number or biological value, in the upper part of the Maroon river, the BOD level was above 20, which means that the water quality of the river is highly polluted, and in the downstream part of the river, the BOD level was less than 13, which is in the category Bandi is considered to be part of the infected group. In Khairabad river, the BOD level was below 10, which is considered as a relatively polluted river. In the investigation of the temperature factor in the Maroon River in winter, the temperature of the river was found in the range of 13 to 16 degrees Celsius, which is not suitable for carp breeding, and in the Khairabad River, the temperature range is somewhat proportional and in accordance with the standard. In the Maroon River, at the time of investigation, the average water temperature varied from 13°C in February to 26°C in July, which considering the temperature of 16-28°C in the survival and survival of warm water fish in a limited period of Winter The temperature conditions of the river in the winter season are not suitable for the standard temperature for raising carp fish and it is suggested to use it from the end of November to the end of March to raise rainbow salmon. Therefore, due to the heavy rains and the occurrence of floods and mud pollution, it is necessary to use the river water indirectly through digging drains on the banks of the river. The minimum flow rate, i.e. 1.5 cubic meters per second, is considered as the basis for calculating the production capacity of tropical fish in the region in the 30 km accessible route from the length of the river to the lake of the Maroon Dam. However, considering the distance of 2 to 3 km to carry out the process of self-purification of river water, as well as the restriction of access to river water in some places and the limitation of land and facilities, the number of 10 warm water fish breeding farms with concrete structures with a capacity of 250 tons per farm and a total capacity Farming along the river is estimated at 2500 tons.
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