Also known as
- Giant Wolf Fish US
- Tiger Fish US
- Traira US
- Trahira US
Identification
A formidable South American apex freshwater ambush predator with a thick cylindrical build optimised for devastating short-range strikes. Juveniles slender, developing the heavy muscular form with age.
- Dark olive to brown body with pale yellowish-white belly
- Massive head up to a third of total body length with an enormous gape
- Prominent fang-like teeth on the lower jaw, visible even when the mouth is closed
- Small eyes positioned high on the head for upward-looking ambush attacks
Where it holds
- Rivers
- Flooded Forests
- Lakes
Behaviour
Apex ambush predators that sit motionless against cover and launch explosive close-range strikes at passing prey using powerful jaws and sharp teeth. Target fish and crustaceans up to 60% of their own body length. Feeding occurs through the day but peaks at dawn, dusk, and through the night. Solitary and highly territorial, aggressively defending feeding holds from other predators. Activity spikes hard once water temperatures exceed 24°C (75°F).
Diet: Characins, Small Catfish, Pacu, Piranha, Shrimp
How it's caught
Line Fishing
Spinning
Cast oversized topwater plugs, jerkbaits, and swimbaits tight to submerged timber, undercut banks, and current breaks. Aggressive walk-the-dog and pause cadences provoke explosive strikes. Wire leader is mandatory; pile on maximum pressure the moment the fish is hooked to keep it out of cover.
Live Lining
Suspend a 10-20cm live characin or small catfish under a heavy float near submerged logs and undercut banks, or free-line it along current seams. Wire leader and 5/0-8/0 circle hooks are mandatory. Let the fish run briefly before coming tight on the hookset.
Bottom Fishing
Anchor dead fish chunks or whole small baitfish on a bottom rig in deep pools and channel holes where aimara hold during daylight. Wire leader is mandatory — the teeth sever anything else. Let the bite fully develop before setting — initial pickups are often subtle.
Fly Fishing
Streamer
Strip 15-25cm baitfish streamers on sinking or intermediate line tight to submerged timber and channel edges. Aggressive long strips with sharp pauses imitate a fleeing baitfish. Wire bite tippet is non-negotiable; strip-set hard and pile pressure on immediately to turn the fish from cover.
