The International Journal of Recirculating Aquaculture presents research and applications expertise in the area of recirculation systems and technology. This journal is intended to be a forum for the open exchange of reliable information on the subjects of recirculating aquaculture. The industry of recirculating aquaculture requires expertise from many different fields such as animal husbandry, economics, water chemistry, waste managment, food safety, genetics, and systems engineering. The following papers focus on a variety of topics, with recirculation as the common element.