Leporinus bistriatus
Two bold dark stripes running the full length of a silvery body make Leporinus bistriatus one of the more visually distinctive small fish in the Tocantins-Araguaia River system of central Brazil. Maxing out around 13.
7 cm, this bottom-hugging grazer of rocky rapids is a fish of scientific surveys and specialty aquarium tanks — not a sport fishing target, but worth knowing if you're exploring the biodiversity of its native basin.
Scientific Name: Leporinus bistriatus
Also known as Black-banded leporinus, Two-striped leporinus
- Two continuous dark longitudinal stripes run the full length of the silvery body — the feature that names the species (bistriatus means 'two-striped') and separates it from close relatives like L. oliveirai, which show discrete blotches rather than unbroken lines.
- Roughly cylindrical, elongated body with a small, low-set subterminal mouth and a forked tail; tops out around 13.7 cm (5.4 inches) standard length and about 53 grams.
- Chisel-edged incisors visible at the mouth tip — shaped for scraping algae and biofilm from rock surfaces, a structural clue that sets Leporinus apart from most other small South American riverfish.
What to know
Habitat Distribution
- A single-basin endemic: the entire known range sits within the Tocantins-Araguaia River system in central Brazil, making it one of the more geographically restricted members of its genus.
- A fish of high-energy water — rocky rapids and bedrock stretches where intense current keeps dissolved oxygen high and scours hard surfaces clean.
- Benthopelagic by habit, holding near the bottom and gravitating toward structure: rock faces, submerged wood, and root tangles where biofilm accumulates.
- Dense aquatic vegetation within the river system serves as breeding habitat, suggesting seasonal movement between rapid-zone feeding areas and slower, weedier margins.
Specific Spots
- Boulder faces and bedrock shelves in active rapids hold this species where current keeps surfaces scoured and biofilm regenerating — the same hydraulic energy that makes these spots hard to fish also concentrates the food source this fish is built to exploit.
- Submerged wood and root masses in slower side channels provide both cover and additional grazing surface, and likely serve as refuges when main-channel flows peak.
- Weedy, vegetated patches along river margins draw breeding pairs during reproductive periods, away from the high-current zones they occupy the rest of the year.
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