Pet Fish Betta Fish (Siamese Fighting Fish)Can live in low-oxygen environments Bladefin BassletThe tiny bladefin basslet belongs to the same subfamily as the giant grouper, Epinephelinae. Fish Flowerhorn FishThe Flowerhorn fish is an artificial species; it does not exist naturally GoldfishGoldfish and common carp can mate and produce offspring Koi FishIn Japanese, the word koi sounds like the word for love. So the fish is a symbol of love among other good things. LoachHave sharp spines below their eyes Oscar FishThe Oscar fish has teeth in its throat! Peppermint AngelfishThe peppermint angelfish was only first described in 1992. Wrought Iron ButterflyfishIs endemic to Japan.