Brycon behreae
A fruit-eating, rapid-dwelling fish native to the Pacific and Atlantic drainages of Panama and Costa Rica, the machaca is one of the few species where matching the hatch means tying on a berry.
Adults crush fallen fruits and flowers with molar-like teeth, and they'll take topwater presentations with the same aggression they bring to a ripe fig dropping from a riverside tree.
Scientific Name: Brycon behreae
Also known as Machaca, Sábalo pipon, Sabalete
- Silver overall, gray-green on the back, silvery-white on the belly — with a thin black bar just behind the gill plate and a distinctive rhomboidal black spot at the base of the tail that bleeds into the caudal fin rays.
- Moderately deep, laterally compressed body with a forked tail and an adipose fin — the classic Brycon build, built for fast water.
- Molar-like teeth designed for crushing seeds and nuts set it apart from most other sport fish; handle with care.
- Most fish run 4–6 lbs; anything over that is a heavyweight. Maximum reported size is around 40 cm and 2.3 kg, with IGFA records for the genus reaching 9 lbs 8 oz.
What to know
Habitat Distribution
- Native to a narrow range in Central America: the Chiriquí del Tire and Chagres River basins in Panama, and the Pacific slope drainages around Quepos in Costa Rica.
- A warm-water river fish — prefers 21–29°C and lives from near sea level up to about 640 meters elevation, in streams and rivers with moderate to strong current.
- Note that in Costa Rica, the closely related Brycon costaricensis occupies the Caribbean slope; both are called machaca and behave similarly, but B. behreae is the Pacific-slope fish.
Specific Spots
- The most reliable holding lies directly beneath fruit-bearing riverside trees — bay cedar, wild cashew, and similar canopy species. When fruit is dropping, machaca stack up underneath and feed aggressively on the surface.
- Rapids and fast chutes concentrate fish; machaca are built for current and will hold in the broken water below drops where food washes through.
- Juveniles use smaller tributary streams as nursery water, so the bigger fish tend to be in the main-stem river runs and pocket water.
Brycon behreae FAQ
Answers from onWater's species guide.
What are the best lures and bait for Brycon behreae?
Small surface lures and poppers that suggest falling fruit or seeds are the go-to; the take is a surface strike, so topwater presentations outperform subsurface ones when fish are actively feeding under trees.
What flies work for Brycon behreae?
Fruit-imitating poppers and foam flies are the signature pattern, tied to suggest a berry, seed pod, or flower falling from an overhanging tree. Presentations should be aggressive and splashy, not delicate; machaca respond to commotion on the surface.
What do Brycon behreae eat?
Adults eat primarily fruits, flowers, and seeds that fall from overhanging rainforest trees, the molar-like teeth are purpose-built for crushing hard seeds. This is the forage that matters most for fly and lure selection.
Where do Brycon behreae live?
Native to a narrow range in Central America: the Chiriquí del Tire and Chagres River basins in Panama, and the Pacific slope drainages around Quepos in Costa Rica.
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