Study on the Effects of Polyculture of the Sterlet (Acipenser ruthenus) Fingerlings and European Catfish (Silurus glanis) on Bioproductive Performances of these Species in Recirculating Aquaculture Systems

• Main Authors: Nicoleta Mihoc, Sandra Mihailov, Dacian Lalescu, Adrian Grozea
• Format: Article
• Language: English
• Published: Agroprint Timisoara 2021-05-01
• Series: Scientific Papers Animal Science and Biotechnologies
• Subjects: sterlet, polyculture, ras, european catfish.
• Online Access: http://spasb.ro/index.php/spasb/article/view/2713
• ISSN: 1841-9364; 2344-4576

The aim of this study was to evaluate the effects of polyculture of the sterlet (Acipenser ruthenus) fingerlings with european catfish (Silurus glanis) (20 – 30%) into recirculating aquaculture system on growth dynamic of the fish and tank’s bioproductivity. Two variants of polyculture have been tested during a period of 42 days in duplicate: V1 - sterlet with 20% catfish (600 sterlets and 120 catfish); V2 - sterlet with 30% catfish (600 sterlets and 180 catfish). The control group (C) contains sterlet in monoculture (600 sterlets). After 42 days of polyculture of the sterlet fingerlings with catfish 20% (V1) or 30% (V2) there were no significant differences (p>0.05) in sterlets’ growth dynamic among the three variants. The bioproductive indices were better in the polyculture variant where sterlets were farmed with 30% catfish. Polyculture of catfish and sterlet could be a good way to positively influence the fingerling sterlet farming in RAS, having a beneficial impact on tank’s bioproductivity. A significant plus of fish biomass (catfish) resulted by means of valorisation of the unconsumed food by the sterlet, was obtained in both polyculture variants.