HEMATOLOGICAL AND BIOCHEMICAL PARAMETERS OF TAMBAQUI SUBMITTED TO RESTRICTION AND FEEDING FREQUENCY IN A RECIRCULATING SYSTEM FOR AQUACULTURE "RAS"

Abstract

This study evaluated the effect of feed restriction and different feeding frequencies on the hematological and biochemical parameters of Tambaqui in a recirculating system for RAS aquaculture. Based on a randomized block experimental design, food restriction was evaluated from three groups (blocks): TR1 (Control) = daily feeding without restriction (7 times a week); TR2 = feeding six days in a row with one day of restriction (6 times a week); TR3 = feeding for five days in a row with two days of restriction (5 times a week). For food frequency, the groups (treatments) were: TF1 = 1x/day (08:00); TF2 = 2x/day (08; 00 and 17:00); TF3 = 3x/day (08:00, 12:00 and 17:00); TF4 = 4x/day (08:00, 11:00, 14:00 and 17:00). At the end of the 30-day experimental period, blood samples were collected to determine hematological and biochemical parameters. TR3 fish showed reductions in Hb, HT, MCV and HCM and an increase in PRT in relation to TR1 and TR2 (p<0.05). In the condition of food frequency evaluation, only an increase in the RBC of TF2 in relation to TF3, in the Gli of TF4 in relation to TF1 and in the PRT of TF2 in relation to TF3 (p<0.05) was observed. Overall, these results indicate that daily and twice-daily feeding resulted in better results in hematology and blood biochemistry, being the most suitable for tambaqui production in an intensive culture system in the RAS modality.