Leporinus unitaeniatus
One of the more cryptically marked members of the headstander family (Anostomidae), Leporinus unitaeniatus is a small characin endemic to the Araguaia-Tocantins river system in Brazil's Amazon basin.
Maxing out around 5 inches, it turns up far more often in scientific survey nets than on a hook — a fish that represents the quietly extraordinary diversity packed into Amazonian secondary rivers.
Scientific Name: Leporinus unitaeniatus
- A single slender dark brown stripe runs the full length of the lateral line — notably lighter on the first 10–11 scales behind the gill cover, then deepening to dark brown toward the tail.
- Eleven to thirteen short dark brown bars cross the back and connect to small dark blotches along the dorsum, a pattern that sets it apart from other single-striped Leporinus species.
- The mouth sits low on the snout (sub-inferior), with stepped incisiform teeth that decrease in size from the jaw center outward — a dental arrangement suited to scraping plant material and algae.
- Maximum standard length around 12.5 cm (roughly 4.9 inches), small even within the Leporinus genus.
What to know
Habitat Distribution
- An endemic of the Araguaia-Tocantins basin in the Brazilian Amazon region, with a narrow natural range concentrated in secondary rivers rather than main-stem channels.
- Secondary rivers within its native basin are its core habitat — smaller, often seasonally variable tributaries where flow and water quality fluctuate more than in the mainstem.
- A probable introduction has been recorded in the upper Paraná basin, likely the result of fish moved out of the Tocantins-Araguaia system.
- Strictly freshwater and benthopelagic — spends most of its time in the lower water column of warm lowland rivers.
Specific Spots
- Breeding pairs occupy patches of dense aquatic weed growth, where thick vegetation provides the cover this species uses for nest-guarding — an unusual behavior among characins.
- As a secondary-river fish, it gravitates toward slower, shallower reaches with softer flow rather than the high-energy main channel.
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