Growth of the ornamental fish Hemichromis bimaculatus (Cichlidae) in a Water Recirculation System, with industrial waste and algae into the feed

Abstract

The objective of this study was evaluate the growth of juveniles of the freshwater ornamental fish H. bimaculatus, Cichlidae, using industrial waste of argentine prawn and beer barley, with algae supplements in the experimental food. The culture was carried out in a laboratory scale water recirculation system. The weight and total length of the individuals, survival, water quality and the functioning of the system used were evaluated. Although significant differences were found (p ˂0.05) for both variables when compared with the control food, of 47.5% protein, growth with the alternative food was positive, specific growth rate 2.0 mg/día, and survival was very high, 98 %. Shrimp and barley residues could be used as raw materials in foods formulated for this species, partially replacing fishmeal, in a more environmentally friendly way and with high regional availability.