Gold Marble Pearlscale Angelfish being offered for sale in a Hong Kong aquarium fish market. Are these fish simply being slowly poisoned as they hang? Image by Kamscharmog | CC BY SA 3.0

https://commons.wikimedia.org/wiki/File:HK_Mong_Kok_aquarium_shop_Tung_Choi_Street_plastic_bag_golden_fish_Sept-2012.JPG | https://creativecommons.org/licenses/by-sa/3.0/deed.en