An experiment was carried out with the aim of evaluating the activity of an organic pigment, Ecotone \u2122, and an inorganic pigment, Lucantin\u00ae Pink, on the coloration of char meat. The effect of 25% and 30% fat in feed on the activity of the pigments was also studied. All experimental items were tested in triplicate. The mean weight of the experimental fish was 564 g at the beginning of the experiment and 1381 g at the end of the experiment after 131 days. The temperature during the experimental period averaged 8 C\u030a and the salinity of the broth was 20 \u2030. The digestibility of astaxanthin in Lucantin\u00ae Pink was much higher than in Ecotone \u2122. The difference in body color measured by different methods turned out to be much smaller, which indicates a better utilization of the color in Lucantin\u00ae Pink. Little effect on body coloration was found by different amounts of fat in the feed and this was true for both pigments. The organic dye is more expensive to buy than the inorganic one and it results in approx. 5.5 % is more expensive to dye char with Ecotone \u2122 compared to Lucantin\u00ae Pink. During the analysis of the color of the feed at the beginning and at the end of the experiment 16 weeks later, it was found that there was a significant loss of color from the feed and that loss appeared to be independent of the type of color.<\/p>\n\n\n\n
A feeding trial was conducted to compare the pigmenting efficiency of the biological colorant Ecotone \u2122 containg astaxanthin and prepared from the red yeast Phaffia rhodozyma, and the synthetic colorant Lucantin\u00ae Pink in Arctic charr. Both colorants were incorporated into diets containing either 25 or 30% lipid. All treatments were run in triplicate. The initial average weight of the fish was 564 g and the final weight 1381 g after a trial period of 131 days at 8 C\u030a and 20 \u2030 salinity. The digestibility of astaxanthin seems to be very much dependent upon the astaxanthin source. Differences in flesh color indicate a better utilization of astaxanthin from the synthetic source (Lucantin\u00ae Pink) as compared to the biological source (Ecotone \u2122). There was only a minor effect of lipid content on utilization of the astaxanthin. The biological astaxanthin source is more expensive than the synthetic source, resulting in about 5,5% higher production cost of fish produced with the \u201corganic\u201d colorant Ecotone \u2122 as compared to fish produced with the synthetic source of astaxanthin (Lucantin\u00ae Pink). The astaxanthin content in all diets proved to be very unstable when the feed was stored under conditions that are common in production of Arctic charr (10 - 20 \u030aC indoors). The loss of astaxanthin ranged from 21-40% and tended to be higher in diets containing Ecotone \u2122. Thus, it is very important to avoid high temperatures, light and oxygen during storage of the feed.<\/p>","protected":false},"excerpt":{"rendered":"
Colouring of Arctic charr \/ Litun bleikjuholds Tilraun var framkv\u00e6md me\u00f0 \u00fea\u00f0 a\u00f0 markmi\u00f0i a\u00f0 meta virkni l\u00edfr\u00e6ns litarefnis, Ecotone\u2122, og […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_uag_custom_page_level_css":"","site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[15],"tags":[858,687,1241,769,772,773,774,1242],"class_list":["post-31898","post","type-post","status-publish","format-standard","hentry","category-skyrsla","tag-arctic-charr","tag-bleikjueldi","tag-colorants","tag-feed","tag-flesh-colour","tag-fodur","tag-holdlitur","tag-litarefni"],"acf":[],"yoast_head":"\n