I would like to bring up an important point, the dyeing of fish. This is a barbaric practice which often involves chemical baths or needles, these fish have a very high mortality rate and the colour often fades within a matter of months. There is little doubt that any method of changing the colours of a fish is misleading to customers and all methods, except feeding natural colour enhancing foods, are extremely cruel to the fish.
https://www.aquaticcommunity.com/responsible/paintedfish.php
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https://www.aquaticcommunity.com/responsible/paintedfish.php
(broken link removed)