Poecilia vivipara

Guaru, a reference photo
Photo: Internet Archive Book Images · No restrictions (licence)

Poecilia vivipara, sometimes called the southern molly, is a small euryhaline livebearer fish distributed along the Atlantic coast of South America. It is most frequently found in standing brackish water. It has been introduced outside its native range to control mosquito populations and is occasionally kept in home aquariums.

From Wikipedia, under CC BY-SA 4.0.

Is it venomous or poisonous?

We have no record of Guaru being toxic, poisonous or venomous. That is not proof that it is safe. Never eat, touch or handle a wild plant, mushroom or animal on the strength of an identification; ask someone qualified.

Easily confused with

Classification

Kingdom
Animalia
Phylum
Chordata
Class
Actinopterygii
Order
Cyprinodontiformes
Family
Poeciliidae
Species
Poecilia vivipara

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