The effect of various drugs on the growth rate of sterlet larvae

An  experimental  study  of  the  effect  of various  feed  additives  on  the  rate  of  mass accumulation,  growth  rate  and  survival  of sterlet larvae was carried out. Four groups of fish  were  planted  in  flowthrough  plastic pools with 150 fish each. The control group (I) was fed without additives, while the experimental group was fed with the addition of  different  preparations:  II -  preparation "AQUATAN"  based  on  ellagotannins  produced  by  the  company  "Tanin",  Sevnica, Slovenia. Sevnica (Slovenia) at the rate of 2 g/kg  of  feed,  III - antibacterial  preparation based on ciprofloxacin "Antibak-100" (LLC "NVTs Agrovetzaschita"), at the rate of 0.5 g/kg live weight of fish, IV - probiotic based on  Bacillus  subtilis  "SUB-PRO"  (LLC "Vector-Euro")  at  the  rate  of  100  g/t  feed. The preparations were added to the feed according  to  the  instructions.  The  effect  of preparations on fish was evaluated by fishery indicators: average daily growth rate, absolute  growth,  average  daily  gain  and  mass accumulation coefficient. During the experiment it was found that the values of fishery indicators  in  different  groups  of  sterlet changed  with  different  intensity  depending on the time after the beginning of the experiment. The highest growth rate and mass accumulation  rates  were  recorded  in  fish  fed with  SUB-PRO  and  Antibak-100,  and  the lowest  with  Aquatan.  The  results  obtained indicate the expediency of further studies of the effect of various preparations on the fishery parameters of aquaculture objects aquaculture.