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Astaxanthin-rich oil extract from Louisiana crawfish by-product imparted a salmon-red coloration to the flesh and integument of rainbow trout on a diet containing 45 mg astaxanthinlkg feed. Carotenoids deposited in fish flesh were stable (ca 90% retention) in air-packed samples at 1 -2°C. Oxygen-evacuated and COz-enriched packaging gave adverse color stability. Lowest pigment levels were in frozen samples, with 53% of the absorbed pigment degraded in 14 days. Visual color scores were consistent with quantitative pigment analyses (r = 0.77). Higher pigment contents were observed in airpacked (1 -2°C) samples, possibly due to astacene or other breakdown products of astaxanthin. Maximal TBA values were observed in air-packed (1 -2'C) samples. The effect of tissue enzyme homogenate on fading of trout flesh is discussed.

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Sun-dried shrimp from Taiwan and Louisiana were stored at 22OC for 8 months in modified atmospheres of air or vacuum. Packages were randomly selected at 2-month intervals and analyzed for moisture, water activity (a,), total volatile nitrogen, ammonia and pigment oxidation. Moisture and a, were shown to decrease during the storage period regardless of the package atmosphere; however, the amount of decrease was less in samples stored under vacuum than in air. Total volatile nitrogen and ammonia increased during the storage period, with samples stored in air showing the greatest increases. Pigment oxidation reached a maximum at 4 months, samples stored in a vacuum showed the least amount of oxidation.