Dogtooth Characin

About

The dogtooth characin (Cynodon gibbus) is one of those fish that looks far more dangerous than it acts. Native to the Amazon and Orinoco river basins as well as the rivers of Guyana, it belongs to a small group of characins defined by dramatically elongated canine teeth on the lower jaw. Teeth so prominent they slot into corresponding openings in the upper jaw just so the mouth can close. Despite that hardware, this species is notably calmer than many of its relatives, and for a predatory characin of this size it is arguably one of the more manageable options for a large home aquarium. It is, however, a fish eater by nature, so tankmates need to be chosen carefully. Anything small enough to be swallowed is at risk, while overly aggressive companions can stress it out, since it tends toward the submissive end of the temperament scale. Keeping a small group of three or more in a suitably spacious setup is recommended, as solitary specimens can struggle. The species is genuinely rare in the hobby, which is a shame given how well-suited it can be compared to some of its more commonly traded but more demanding relatives. Local names across South America include Payara-chata, Perrito, and Peice-cachorro, reflecting just how widely distributed it is across the continent.