Nghiên cứu ảnh hưởng của thức ăn lên tốc độ sinh trưởng và tỷ lệ sống của ấu trùng cá bớp (<i>Rachycentron canadum</i>)

Abstract

     Study on cobia fingerling rearing in composite tanks system with 2 different diets and 3 different live food stocking densities was conducted from Apr, 2016 to Sept, 2016 in the Ninh Thuan Seafood Breeding Center to detremine the optimal diet for cobia larvae 2 - 6 days post hatching. The experiment had three treatments, five replicates per treatment, of live food types which consist 100% rotifer (Rot), and 50% Rot + 50% Nauplius of Copepoda, and three live food stocking densities are 5-10 individuals/mL and 10-15 individuals/ mL, and 15-20 individuals/mL. The results showed that there was no difference in length growth when feeding cobia larvae at different densities of preys. Treatment 50% Rot + 50% Cop resulted in higher growth as total length (p<0.01). Different types of feed did not effect cobia larvae body weight. Different feed densities had different effects on weight growth (p <0.01), therein the preys density 15-20 individuals/mL gave the highest, the preys density 5-10 individuals/mL made the lowest, and the preys density 10-15 individuals/mL made average.

Keywords: cobia larvae, cobia, Rachycentron canadum, live food.