Ảnh hưởng của các loại thức ăn đến tăng trưởng, tỷ lệ sống và hiệu quả sử dụng thức ăn của cua xanh (Scylla paramamosain Estampador, 1949) giai đoạn ương giống

Abstract

The mud crab (Scylla paramamosain) is a high-value aquaculture species rich in nutrients and widely cultured in brackish water ponds in coastal regions. In the Tam Giang - Cau Hai Lagoon of Hue City, local farmers commonly use various feed types for nursing mud crab juveniles. This study aimed to evaluate the effects of different feed types on growth performance, survival rate, feed utilization efficiency, and economic efficiency during the nursery phase of mud crab. The experiment consisted of three dietary treatments: live Artemia biomass (ATS), frozen Artemia biomass (AĐL), and steamed round scad (Decapterus punctatus) (CNH), each with three replicates. After 30 days of nursing, the results showed that mud crabs fed live Artemia biomass exhibited significantly higher growth performance and a better feed conversion ratio than those fed the other two diets (p < 0.05). Similarly, survival rate and economic efficiency were highest in the ATS treatment (56.86%, profit of 387,083 VND m⁻³, and profit margin of 45.35%, respectively), which were significantly higher than those observed in the other treatments (p < 0.05). The results suggest that the use of live Artemia biomass is an effective feeding strategy during the nursery phase of mud crab, as it enhances growth, survival, feed utilization efficiency, and economic returns.