PRELIMINARY RESULTS ON THE INFLUENCE OF THE QUALITY OF FEED ON GROWTH PERFORMANCE SPECIES POLYODON SPATHULA (WALBAUM 1792) THE CONDITIONS OF A RECIRCULATING SYSTEM
M.T. Coadă, N. Patriche, V. Cristea, Mioara Costache, Elena Bocioc, Petronela Georgiana Călin (Sandu), Corina Sion (Bădălan)
The paper presents aspects of assessing the influence of food quality on growth of juvenile Polyodon spathula (Walbaum, 1792), in a recirculating system. Researches were conducted between 01.09-07.10. 2010 pilot laboratory of Department of Aquaculture, Environmental Science and Cadastre of the Faculty of Food Science and Engineering. Experimental system consists in four units of growth with a volume of 0.30 m3 each. The first version was tested on a feed with 54% crude protein (Aller Performa) and the second feed with 41% crude protein (Extra Classic 1P). The biological material was represented by juveniles aged 112 days. They tested two storage densities: in variant 1 - A1 and A3 units-2.81 kg/m3, and the alternative A2 and A4 two-units-3.25 kg/m3.
At the end of the experiment were obtained average body mass of 80 g and 75 g in variant 1 and 100 g and 101 g in version 2. Specific growth rate (SGR) varied as follows: A1-0.77 g% / day, 0.95 g% A3 / day; A2-0.98 g% / day, A4% -1.02 g / day. Feed conversion factor (FCR) was 2.62 and 2.12 g feed / g gain biomass in V1, respectively 2.06 and 1.99 g feed / g gain biomass in V2. Technological indicators have shown that by changing feed quality, fish growth was positively influenced. Paddlefish spathula (Walbaum 1792) is a sturgeon with a moderate rate of growth, it is possible to obtain an increase of biomass, using granules with 41% crude protein.