This fascinating color palette also belongs to some incredible species, as you’ll see here on our list of the top 12 blue fish! Betta fish are incredibly popular, mostly for their ability to ...

The oscar fish ... seen in marine species. If you can only buy one variety of oscar, the blue one should be on your shortlist. This crossbred variation is a mix of different shades of blue ...

Scientists discovered new fish species. These include a blob-headed catfish, a tiny pipehorse, and three pacu species.