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EveryFish
Diamond tetra, young individual in aquarium

Diamond tetra

Small Venezuelan freshwater fish with violet fins

Photo: SOK, CC BY-SA 4.0, via Wikimedia Commons

The diamond tetra is a small freshwater fish native to Lake Valencia in Venezuela. It is prized in the aquarium trade for its reflective scales and violet sheen. Urban growth has threatened its wild habitat, causing it to vanish from the main lake.

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  • Native only to Lake Valencia in Venezuela
  • Males develop violet sheen on elongated fins
  • Reaches a maximum length of 6 cm
  • Bred widely for the aquarium trade
  • Disappeared from main lake due to pollution

What it is

The diamond tetra is a small ray-finned fish found in fresh water. Males are usually larger than females and possess more reflective scales. As they mature, their pelvic, dorsal and anal fins grow longer. Male fins develop a distinct violet sheen, while female fins remain translucent. The species reaches a maximum standard length of six centimetres.

Where it lives

This fish is endemic to the northern region of Venezuela. Its range is restricted to Lake Valencia and its tributaries, situated between the states of Carabobo and Aragua. It inhabits slow moving streams that contain abundant vegetation and leaf litter. Urban expansion has damaged these habitats, leading to pollution and destruction of the natural environment.

How it lives

Wild populations have seemingly disappeared from Lake Valencia itself. In 2009, a photographer located a remaining population in a nearby stream. These fish live in areas with dense plant cover and organic debris on the stream bed. They are adapted to slow flowing water conditions typical of their specific habitat.

Diamond tetra
A drawing made by EveryFish from what this page says. It is a diagram, not a picture of the real fish.

Fish and people

The diamond tetra is bred specifically for export in the aquarium trade. Its common name refers to the reflective scales that shimmer in light. The genus name Makunaima honours a creation god in Amazonian mythology. The specific name likely honours Henri François Pittier, a geographer who collected specimens for the original description.

Status and threats

Urban growth threatens the species by destroying and polluting its habitat. The fish appears to have vanished completely from Lake Valencia, where it was first collected. Conservation concerns focus on the loss of slow moving streams and vegetation due to human development in the region.

A male diamond tetra in a planted aquarium
A male diamond tetra in a planted aquarium. Photo: Rosieandgingerbits, CC0, via Wikimedia Commons

Questions people ask about Diamond tetra

Where does the diamond tetra live in the wild?

It is endemic to northern Venezuela, specifically found in Lake Valencia and its tributaries between Carabobo and Aragua states. It prefers slow moving streams with vegetation.

Why is it called the diamond tetra?

The common name refers to the reflective scales on the fish. These scales shimmer in light, giving the appearance of diamonds, especially as the fish matures.

Is the diamond tetra endangered?

Urban growth has destroyed and polluted its habitat. The species has seemingly disappeared from Lake Valencia, though a population was found in a nearby stream in 2009.

Good reading and sources

Where this page comes from

The facts on this page come from the Wikipedia article "Diamond tetra", written by its contributors and used under the CC BY-SA 4.0 licence, and from its Wikidata record (CC0). EveryFish rewrote the text in its own words, with AI assistance, and compares every page with the article to make sure no passage is copied. It may be reused under the same CC BY-SA 4.0 licence with a link back.

It may contain mistakes, and figures change over time. Nothing here is investment or buying advice. If something is wrong, tell us. Last refreshed 2026-11-15.

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Photo credits on this page

The small pictures above come from Wikimedia Commons under free licences. Some are cropped to fit.

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