The kissing loach is scavengers which are also omnivorous. As They're bottom feeders, they don't seem to be generally picky about whatever they eat. The European sea sturgeons gained acceptance in the 19th century because of caviar output. In 1982 the species became protected in France and 1998 in Europe, https://customfishtankonline.mystrikingly.com/blog/why-should-you-buy-a-fish-aquarium-online