The effects of dietary supplementation of astaxanthin on survival, growth, pigmentation and anesthetic stress of blood parrot, Cichlasoma var. in the soft and hard water

• Main Authors: Kung-Chih Tseng, 曾功智
• Other Authors: Chih-Hung Pan、Win-Ton Cheng
• Format: Others
• Language: zh-TW
• Published: 2007
• Online Access: http://ndltd.ncl.edu.tw/handle/48554720687033050319

碩士 === 國立屏東科技大學 === 水產養殖系 === 95 === Ornamental fish are unable to synthesize carotenoids de novo, However, astaxanthin the predominant carotenoid in fish plays important roles not only on pigmentation in surface of body but also on biological function such as antioxidative ability. This study was aimed to find out the growth, survival., pigmentation and some of the biological function of astaxanthin in ornamental fish, blood parrot, Cichlasoma var. through two studies: Effect of dietary supplementation of astaxanthin on survival, growth and pigmentation of ornamental fish, blood parrot, Cichlasoma var. in soft and hard water. No difference in survival was found among all fish. The growth of fish reared in soft water was higher than that of fish reared in hard water. After 12 weeks’ rearing, body astaxanthin concentration of fish reared in the hard water was higher than that for fish reared in the soft water. The pigmentation of body astaxanthin of control fish was significantly lower than that fish with pigmented diets. The resistance to anaesthetic stress by ornamental fish fed diets supplemented with astaxanthin. This study was aimed to determine if increasing body astaxanthin content through dietary supplementation(160 mg kg-1 and 320 mg kg-1 astaxanthin for 12 weeks) could enhance fish’s antioxidant defense capability and resistance to anaesthetic stress (2-phenoxyethanol 200 mg/L, for 1 h.).Total antioxidant status (TAS ) in the soft and hard water were improved by the presence of dietary astaxanthin since TAS of fish fed with astaxanthin was significantly higher than those of fish fed 0 mg kg-1 astaxanthin under anaestetic stress. Superoxide dismutase (SOD) was reduced by the presence of dietary astaxanthin. Glutathion peroxidase (GSH-Px) content of fish did not reflect improvement in health following anaestetic stress. However, alanine aminotransferas (ALT) content of fish fed 320 and 160 mg kg-1 astaxanthin in hard water were significantly lower than those of fish fed 0 mg kg-1 astaxanthin under anaestetic stress. The levels of TBARS of the fish fed with astaxanthin were found to be as low as that of the control, when the fish exposed to anaestetic stress. Both soft and hard water, the LPO levels in fish fed 320 and 160 mg kg-1 astaxanthin were significantly lower than that of the control.