Biological Regulation of Water Quality in Aquaculture

Abstract

Aquatic organisms that can be used to regulate water quality and sediment quality in aquaculture mainly include macrophytes, filter-feeding fishes, bivalves, deposit-feeding sea cucumbers, etc. These instrumental species in aquaculture are the integrated organisms with main target organism. These instrumental specise not only play a role in regulating and improving the water quality or/and sediment quality of aquaculture waters, but also normally possess high commercial value. For these instrumental species, we should not only understand the characteristics and mechanisms of their growth and survival, but also pay more attention to their effects on aquaculture environment. In this chapter limiting factors of primary production, nutrient uptake kinetics of seaweeds, interaction between seaweeds and microalgae, feeding of filter-feeders, and effects of filter-feeders on water quality and sediment quality are introduced.