RESEARCH ON THE GROWTH OF THE RUTHENUS ACIPENSER SPECIES - CEGA AT A 13°C WATER TEMPERATURE IN A RECIRCULATING SYSTEM

M.C. Cioran, E.G. Naşcu, B. Păsărin

Abstract
   This study followed the growth rate of the species Acipenser ruthenus, at a water temperature between 13.2° C and 13.6° C. The water supply from the farm under study was pumped from a depth of 130 meters with a temperature of about 13°C. The study was conducted over a period of 100 days starting with September 28, 2018 and ending on January 6, 2019. The pools populated with the Acipenser Ruthenus species had a volume of water of 10.8 m³ with a filling degree of 10 m³ / water. The population with biological material was realized with a number of 1611 copies totaling a total weight of 104 kg. In addition to the growth rate of the species studied, the consumption of extruded fodder and the minimum and maximum lengths of the biological material were also tracked.
   Starting from a weight per unit of about 64 g at the end of the research period, we reached a weight per unit of about 147.5 g of blind. The fish were fed throughout the period with extruded feed from Biomar company having a crude protein of 46% and a granulation of 3 mm. The control fishing was carried out bi-monthly and the feed was administered 4 times a day starting from an amount of 2.3 kg / day. The oxygen dissolved in water had values between 8.08 and 9.01 mg / l.

Key words: recirculating system, growth rate, extruded feed