Serrasalmus Marginatus

Datasheet

General Description

There are currently 24 described species of Serrasalmus, with S. marginatus being distinct due to its thick, black, v-shaped marking in the caudal fin. Juveniles can be differentiated by their oval/rounded dark body spots. Serrasalmus species are not true piranhas but are often referred to as such in the English-speaking world. These fish are not aggressive unless threatened and can live for over ten years, becoming less active as they mature.

Aquarium Setup

To house Serrasalmus Marginatus effectively, a planted tank with ample shaded areas is recommended, resembling its natural habitat with roots, branches, and floating vegetation. While some individuals may nip at plants, most are omnivorous. Water quality is crucial, necessitating external canister filters, moderate water flow, and weekly partial water changes. For safety, heaters should be external to prevent fish attacks.

Behaviour

This species is best kept alone as it does not make a suitable tankmate due to its natural diet and aggressive tendencies. Cohabitation often leads to fighting until only one fish remains. Serrasalmus Marginatus is not gregarious by nature and is not recommended to be housed with conspecifics.

Feeding and Diet

In the wild, Serrasalmus Marginatus feeds on the fins of other species, smaller fish, insects, and crustaceans. In captivity, they can be weaned onto dead foods, although some individuals may initially refuse. Juveniles enjoy bloodworms, Tubifex, Artemia, and prawns, while adults should be fed larger items like mussels, prawns, and earthworms. Avoid feeding mammalian/avian meat and feeder fish to prevent health issues.

Reproduction & Dimorphism

There are no reports of Serrasalmus Marginatus spawning in aquarium settings, and sexual dimorphism is unknown. The species is not known to have distinct visual differences between males and females.

Habitat and Distribution

Serrasalmus Marginatus is found in rivers, pools, and creeks in Brazil, Paraguay, Uruguay, and Argentina, particularly in the Rio Paraguay and Rio Paraná drainages. It prefers shaded areas with dense vegetation and can defend feeding territories up to 4 square meters.