A possible system configuration comprises of a fish farm with nutrient assimilation by molluscs and seaweed (Fig. 2). Here, nutrients released in the culture system can be converted into plant or other biomass,which can easily be removed and may often be a valuable by-product. The nutrient-assimilating photoautotrophic plants can be used to turn nutrient-rich effluents into profitable resources (Neori et al., 2004). Biofiltration by plants generates in the culture system a mini-ecosystem, in which, if properly balanced, plant autotrophy counters fish (or shrimp) and microbial heterotrophy, not only regarding nutrients but also with respect to oxygen, pH and CO2 (Neori et al.,2004). As a result, plant biofiltration diminishes the net environmental impact of aquaculture production systems. Today's integrated intensive aquaculture approaches,developed from traditional extensive polyculture, integrate the culture of fish or shrimp with vegetables, microalgae, shellfish and/or seaweed (Neori et al., 2004). By dividing the production process into stages, we can increase the constancy of the biomass in the system and improve the utilization efficiency of the physical facility (Wang, 2003).