In Iran, water is a limited factor in agricultural development and as such the management of water consumption has become a vital issue in recent years. This study was conducted to determine factors affecting the demand for water in fish farms in Kohgilooyeh province. By using two staged cluster sampling method, a sample of 55 farmers was selected and interviewed. The demand function for water was estimated by application of profit maximization approach. The results of the study revealed that number and weight of baby fish, labor and water had positive and water temperature had negative effect on fish production. Among the factors, water temperature with coefficient of 0.73 was the most effective factor in fish production. The price elasticity of demand was equal to -1.27, which showed that water demand in fish farms is price elastic and a fair water pricing could persuade farmers to use water more efficiently.
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