In recent years, the country's aquaculture industry has been growing, especially in the ornamental fish sub-sector, with the production of healthy products. It has a special place in creating employment, providing food security and creating vitality, happiness and currency. Like other agricultural sectors, the low level of coordination between different parts of the supply chain is one of the main problems of small businesses in Iran's aquaculture sector. Poor communication and coordination between input suppliers, producers, processing industry, warehousing industry, transportation industry, retail networks, wholesale and consumers has led to a high gap between producer and consumer price of aquaculture products. Therefore, it is necessary to strengthen the communication of different parts of the production chain, especially the communication between producers and related industries, by using a suitable mechanism. The development and completion of value chains of aquaculture products based on contract aquaculture can solve many of these shortcomings and solve the problems of small businesses in the aquaculture sector. The purpose of this research is to assist applicants in implementing contract aquaculture in the sub-sector of ornamental fish, as well as policy-making and regulation of relations between various government agencies and departments with the private sector to support the correct implementation of this model.