The usability of barothermally modified casein in feed mixes for Siberian sturgeon (Acipenser baeri Brandt) juveniles

Abstract

Experimental tests were conducted on six Siberian sturgeon feed mixes containing from 0-35% sodium caseinate. A 50-day growth test of Siberian sturgeon fry with an individual body weight of 6.77 g was performed under controlled conditions in an aquarium hall in 60 l flowthrough aquaria. The extrusion method was applied to prepare experimental feeds for isonitric and isocaloric diets. The composition of the protein amino acids and the fatty acids profiles of the lipids in the feeds were identified. The following rearing effectiveness indices were used in the final evaluation of the feeding test: Specific Growth Rate (SGR); Food Conversion Ratio (FCR); apparent Net Protein Utilisation (aNPU); Protein Efficiency Ratio (PER). Conclusions were drawn based on statistical analysis using the SAS computer program. The best rearing results were obtained with feed mixes containing 7-21% sodium caseinate - final individual fish mass of 64.57-67.57 g, food conversion ratio of 0.88-0.90 and a protein efficiency ratio of 2.19-2.24.

CORRESPONDING AUTHOR:

Jan Mazurkiewicz, Akademia Rolnicza im. Augusta Cieszkowskiego w Poznaniu, Katedra Rybactwa Śródlądowego i Akwakultury, ul. Wojska Polskiego 71C, 60-625 Poznań; Tel./Fax: +48 (61) 8487706; e-mail: karp@owl.au.poznan.pl