Abstract
The effects functional additives had on blood hematological and biochemical indicators of sea trout (body weight 74.6 g, standard length 17.2 cm) were studied. The fish were divided into four experimental groups. Two groups were fed experimental feeds (group TU basic feed; group TUB basic feed with Bioimmuno), and two groups were fed commercial feeds (group TB commercial feed; group TBF commercial feed with FOCUS Plus®). After 14 and 28 days of rearing (the end of the experiment) specimens were measured and blood was drawn from seven fish from each group for hematological and biochemical tests. No effects were confirmed on rearing parameters. After 14 days of rearing, decreased values of WBC, RBC, HGB, and HCT were noted in groups TU and TB, while after 28 days lower values of RBC and HCT persisted in these groups. Lower values of these parameters were also noted in group TUB. Increased ALP activity was noted in group TUB after 14 days, while in groups TU and TUB increased levels of TP and ALB were noted after 28 days. A significant increase in ALB was also noted in group TBF. The functional feeds positively affected the physiological state of the sea trout. The results indicated that it is necessary to conduct studies to determine the optimal dose of Bioimmuno for juvenile sea trout and the period during which functional feeds should be given.