BIOSYNTHESIS of ketocarotenoids (e.g. canthaxanthin, astaxanthin) in plants is rare; UK researchers trial trout feeding with GM tomato ketocarotenoids

Read: “Genetically Modified Tomatoes Give Fish a Futuristic Hue. Researchers developed a tomato rich in pigment to give farmed fish a healthy pink glow.” (Hakai Magazine, 03.07.2018) https://www.hakaimagazine.com/news/genetically-modified-tomatoes-give-fish-a-futuristic-hue/

Starts :

“Imagine a society in which fish are raised in pens and fed food laced with dyes from genetically modified tomatoes in order to trick consumers into thinking that the fish on their plates grew up in the wild, swimming free, hunting, and being hunted. It sounds like something out of dystopian sci-fi, but that future is, potentially, right around the corner.”

[…] “The researchers grew their modified tomatoes in a closed greenhouse in the United Kingdom. The tomatoes were then freeze-dried and shipped to Germany, where they were powdered and mixed into the feed for farmed trout. The scientists found that the fish absorbed roughly twice as many ketocarotenoids from the tomato feed as they did from an equivalent amount of petrochemical-derived dye.”

[…] “The plant-based feeds developed were more efficient than the synthetic feed to color trout flesh (up to twofold increase in the retention of the main ketocarotenoids in the fish fillets). This achievement has the potential to create a new paradigm in the renewable production of economically competitive feed additives for the aquaculture industry and beyond.”

Source: “Engineering of tomato for the sustainable production of ketocarotenoids and its evaluation in aquaculture feed” (PNAS October 10, 2017. 114 (41) 10876-10881): http://www.pnas.org/content/114/41/10876