Nghiên cứu sử dụng cà rốt (Daucus carota) thay thế thức ăn viên trong nuôi tôm thẻ chân trắng (Litopenaeus vannamei) theo công nghệ biofloc

Abstract

The study was conducted to determine the appropriate replacement levels of commercial pellet feed with carrot (Daucus carota) for growth rate and quality of white leg shrimp (Litopenaeus vannamei) under biofloc system. The experiment was randomly set up with four treatments at different carrot replacement levels including (i) 100% commercial pellet (control), (ii) replacement of 10% amounts of the commercial pellet by carrot, (iii) 20% commercial pellet replacement, and (iv) 30% commercial pellet replacement. The initial weight of shrimp was 0.37±0.09 g and length of 3.49±0.32 cm) were cultured in the biofloc system with ratio of C:N = 15:1, at stocking density of 150 shrimp/m3 and water salinity of 15‰. After 60 days of culture, final shrimp weight ranged from 8.2 to 9.0 g and there was no significant difference among treatments. The 30% replacement commercial pellet by carrot showed better survival rate (86.7%) and higher shrimp biomass (1.1 kg/m3) as well as the lower feed cost (49.702 VND/kg) compared to other treatments. There were significant differences (p>0,05) in survival rate, shrimp biomass and feeding cost between control treatment and 30% replacement of commercial pellet by carrot treatment while there was no significant difference (p>0,05) between treatments of replacement of commercial pellet by carrot. The replacement of commercial pellet by carrot enhanced shrimp perceptible odor and flavor, especially shrimp color while proximate composition of shrimp meat were not significant difference among feeding treatments.