Title: Pigmentation of rainbow trout with astaxanthin at different water temperatures
Abstract: The effect of water temperature (5 °C and 15 °C) on pigmentation of rainbow trout was investigated by feeding a test diet supplemented with 57 mg astaxanthin/kg in comparison with a control diet without added astaxanthin. The growth rate, flesh percentage in the body, and fat content of the flesh were higher in the fish reared at 15 °C than at 5 °C throughout the experiment. After feeding the test diet for 6 weeks, the flesh contained more carotenoids at 15 °C than at 5 °C, but no significant temperature effects on the carotenoid concentration in the skin, liver and gut were observed. After feeding 6 weeks at 15°C and 18 weeks at 5 °C (280 day-degrees), comparable average weights and flesh carotenoid levels were obtained. The skin, however, contained more carotenoids at 5 °C than at 15 °C. Astaxanthin was the predominant carotenoid in all tissues and no effects of water temperature on the carotenoid composition were seen. There were high correlations between carotenoid concentration and instrumentally measured CIE (1976) L*a*b* colour values of the flesh, and between carotenoid retention and digestibility, respectively.
Publication Year: 1991
Publication Date: 1991-09-01
Language: en
Type: article
Indexed In: ['crossref']
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Cited By Count: 56
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