King Weakfish
Pescadilla real is a native sciaenid — a drum and croaker relative — that runs the Argentine Sea from the Río de la Plata estuary south toward Bahía Blanca.
It's a minor commercial species caught by bottom trawl, but shore and small-boat anglers pick it up in estuaries and shallow coastal flats. Not a destination fish, but a real and accessible target along Argentina's Atlantic coast.
Scientific Name: Macrodon ancylodon
Also known as Pescadilla real
- Elongated, compressed body; silvery grey on the back fading to pale yellowish below; dark patch at the base of the pectoral fin.
- Large, upward-angled mouth with a projecting lower jaw and a prominent pair of large, curved teeth at the front of the upper jaw — the feature that gives the genus its name ("large tooth").
- S-shaped tail fin edge; lateral line runs all the way to the center of the tail fin tip — useful for separating it from similar croakers.
- Common fish run around 35 cm; maximum recorded is about 53 cm. Most fish handled by anglers fall in the 25–40 cm range.
What to know
Habitat Distribution
- Native to the western South Atlantic; in Argentina its range runs along the coast from the Río de la Plata estuary south to Bahía Blanca.
- Demersal — lives and feeds near the bottom over mud and sandy-mud substrates in coastal waters, generally from the surface down to about 60 m, most commonly shallower than 25 m.
- Juveniles concentrate in estuaries and tidal mudflats; adults move into open coastal bays and nearshore marine waters, tolerating both brackish and full marine salinity.
Key Locations
- Argentine Sea (FAO Zone 41, Southwest Atlantic) — the primary commercial and recreational catch area along the coast.
- Río de la Plata estuary — the large brackish estuary where juveniles are particularly abundant on tidal mudflats.
- Bahía Blanca area — near the southern limit of the species' Argentine range, accessible to shore anglers.
Specific Spots
- Tidal mudflats and estuary channels — juveniles stack here, and adults follow baitfish and shrimp into these areas on incoming tides.
- Sandy-mud bottom in shallow coastal bays, particularly near current breaks where tidal flow concentrates prey.
- Nearshore drop-offs where the bottom transitions from flat sand to softer mud — a consistent holding zone for feeding fish.
King Weakfish FAQ
Answers from onWater's species guide.
What are the best lures and bait for King Weakfish?
Small jigs (5–15 g) with soft-plastic tails in shrimp or grub profiles, worked slowly along the bottom, match the natural forage and keep the presentation in the feeding zone. Slim, sinking minnow-style hard baits retrieved near the bottom imitate the small fish that make up the other half of its diet.
When is the best time to fish for King Weakfish?
Commercial trawl records show peak catches from June through September (austral winter and early spring), suggesting fish are most concentrated and accessible in cooler months. Estuarine fishing for juveniles and smaller fish can be productive year-round where tidal mudflats are accessible.
How do you catch King Weakfish?
Most pescadilla real in Argentina are taken incidentally by shore anglers fishing estuaries and coastal bays with natural bait on the bottom. Small-boat anglers working sandy-mud flats with light jigs also encounter them regularly, particularly on tidal movement.
What do King Weakfish eat?
Feeds primarily on shrimp and small fish. Small jigs, soft-plastic shrimp imitations, and slim minnow-style hard baits all match this forage well.
Where do King Weakfish live?
Native to the western South Atlantic; in Argentina its range runs along the coast from the Río de la Plata estuary south to Bahía Blanca. Demersal, lives and feeds near the bottom over mud and sandy-mud substrates in coastal waters, generally from the surface down to about 60 m, most commonly shallower than 25 m.
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