ẢNH HƯỞNG CỦA ASTAXANTHIN BỔ SUNG VÀO THỨC ĂN LÊN SỰ TÍCH LŨY SẮC TỐ TRONG CƠ-DA, KHẢ NĂNG CHỊU SỐC ĐỘ MUỐI VÀ KHÁNG LẠI ĐỘC TỐ ĐỒNG CỦA CÁ KHOANG CỔ NEMO, Amphiprion ocellaris THƯƠNG MẠI

This study examined the influence of Astaxanthin added in feed on pigment accumulation in the muscle-skin, as well as resistance to salinity stress and copper toxicity of clownfish (Amphiprion ocellaris). Mean length of fish was 33.05 ± 3.29 mm. Five experiments were performed with synthetic Astaxanthin contents: 0, 50, 100, 150 and 200 mg/kg diets. After 8 weeks of the experiment, the pigment accumulation of Astaxanthin in the muscle-skin of clownfish was the lowest in the control treatment of 2.11 ± 0.13 µg/g, while these treatments of 150 and 200 mg/kg diets were over 10 µg/g. The treatments of 150 and 200 mg Astaxanthin/kg increased the resistance to copper toxicity and salinity stress test of the fish. The resistance of the fish was longer (>50 minutes) compared to the control (42.4 minutes) in an environment with salinity of 0‰ (p 0.05). Thus, the optimal content of astaxanthin supplement in fish food was 150 mg/kg diet, which created high pigment accumulation in the muscle-skin; increased resistance to salinity stress and copper toxicity.