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The aim of this paper is to present a model of mariculture waste in the marine environment. The model can help determine the sustainability of mariculture in the area. It is divided into four sub-systems (organic matter, dissolved oxygen, dissolved nitrogen and algae-phytoplankton subsystem) and is defined by six basic variables connected by cause-effect relationships. Each of these variables is defined by one or several functions of state. The basic input into the system is the amount of waste generated by mariculture entering the observed water environment.