科研之友
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摘要
Cultured yellowtail Seriola quinqueradiata (also known as buri) are exposed to more stress and strenuous exercise than wild fish because of high-density breeding and declines in water quality from waste feed. The excessive exercise leads to the production of free radicals and reactive oxygen species that modify several critical cellular components. Thus, exercise could affect flesh quality. Yellowtail were restrained with a fishing line tied to the tail and pulled for 30-40 min until they were fully exhausted. As a result, after exercise lipid peroxide levels increased significantly, from 95 +/- 25 (mean +/- SD) to 170 +/- 13 nmol/g of tissue in red muscle and from 130 +/- 31 to 237 +/- 29 nmol/g of tissue in the liver. These increases in lipid peroxide levels were mainly the result of peroxidation of phospholipids and not neutral lipids. In particular, the ratio of phospholipid peroxides to neutral lipids in the liver increased from 30.4 +/- 11.4% to 55.4 +/- 13.8%. However, no significant increase in hydroxy lipids was observed after exercise. These results suggest that yellowtail should be maintained at low densities, transferred quickly to marketing containers from the culture tank, and exsanguinated to prevent adverse effects on flesh quality.
- 出版日期2012
