Technical and Economical Structure design for tilapia fish farming in a greenhouse system equipped with biofloc

In this research, extension recommendations have been expressed in order to achieve a suitable structure for the production and breeding of tilapia in a greenhouse system equipped with biofloc technology. For this purpose, three international designs of fish farming systems in a greenhouse system equipped with biofloc technology were reviewed. These three structures include the main biofloc reservoir and sedimentation tank, breeding tank with middle cone - external discharge line, and two-stream reservoir system. In this regard, the required equipment for each structure was presented parametrically and the economic evaluation of the structures was done in order to select the structure with the lowest cost. A comparison of all three structures was performed for a capacity of 60 tons. Common equipment in all structures includes an 85 cubic meter tank with skeleton and sheet structure and polycarbonate cover / per square meter. Cost analysis on the electricity consumption index showed that the cost of energy consumption in plan 3 is higher, so that it is about 8 times more than plan 2 and about 13 times more than plan 1. But in terms of the cost of building the required tanks, plan 3 is optimal. Therefore, according to the needs of breeding farms and the specific restrictions of each region, one of the plans 1 or 3 can be implemented.