Available Online: http://www.ejpau.media.pl/volume2/issue2/fisheries/abs-03.html
COMPARISON OF THE EFFECTS OF CAGE–REARING OF STERLET (ACIPENSER RUTHENUS) AND RUSSIAN × SIBERIAN STURGEON (ACIPENSER GUELDENSTADETDTI × A. BAERI) HYBRID FRY IN COOLING WATER
Jarosław Filipiak, Przemysław Czerniejewski, Jacek Sadowski, Rajmund Trzebiatowski
Within 17 September – 31 October 1997, fry of the Russian × Siberian sturgeon hybrid of 31.1 g mean individual weight and sterlet fry of 25.4 g mean individual weight were fed two trout feeds: the Dana–ex 4.85 and the Safir differing, i.a., in their gross energy content (5470 and 5173 Kcal·g–1, respectively), each feed being offered in triplicate. The fish were kept in cages, stocked at 80 ind./cage, placed in power station cooling water of temperature changing within 12.2–23°C. Water temperature–dependent differences in fish growth were revealed: the hybrid grew better at 19–23°C, while the sterlet growth was better at 12–18°C. In both fish groups, the Dana–ex 4.85 produced better food conversion rate (FCR) and apparent net protein utilisation (aNPU).
Key words: sturgeon, feeding, cooling water, cage..