Wimple Piranha (Catoprion mento) Breeding Guide

Catoprion mento is a scale-eating serrasalmid whose aquarium spawning is unreported; this guide covers sexing and the obstacles to breeding it.

Overview

Catoprion mento, the wimple piranha, is a serrasalmid recorded from Colombia, Venezuela, Guyana, Brazil and Bolivia, including Pantanal wetlands. According to Seriously Fish it reaches about 15 cm (usually a little smaller) and is a scale-eating specialist that feeds largely on the scales of conspecifics and other fish in nature, using specially adapted teeth. Its reproduction in aquaria is unreported.

Sexing

Seriously Fish reports that males display a clearly convex anal fin, while the female does not. This is the only documented external sexing cue for the species.

Conditioning

In captivity most specimens accept chopped prawn, mussel, lancefish and other meaty foods rather than live fish. Seriously Fish stresses that the species is sensitive both to poor water quality and to uneven swings in chemistry, so small regular water changes are preferred over occasional large ones.

Breeding Setup

No documented spawning protocol exists. Seriously Fish lists keeping parameters of 23-26 C, pH 5.8-6.5 and hardness 1-5 dH, with the fish coming from rivers, streams, tributaries and Pantanal wetlands; soft, slightly acidic and very stable water would be the logical baseline for any attempt.

Spawning Behavior & Trigger

Spawning behavior, eggs and fry rearing are unreported for Catoprion mento in the consulted sources, so no trigger or egg-care protocol can be stated reliably.

Common Challenges

The scale-eating diet and aggressive disposition complicate keeping conspecifics together, and the species' sensitivity to chemistry swings raises the difficulty further. Combined with the absence of any documented spawning, home breeding remains effectively unestablished.