Hoplerythrinus

Also known as the golden trahira, H. unitaeniatus is the only one of the three recognised species currently in the genus to appear in the trade with any regularity. It's really a fish suitable only for the specialist, and as with any predatory species, care must be taken when performing tank maintenance. It's a representative of an ancient group of fishes, and possesses a modified, highly vascularised swim bladder that acts as an accessory breathing organ, allowing the fish to survi...