Stripped Weakfish
The striped weakfish — known locally as pescadilla or corvinata — is one of Argentina's most commercially and recreationally important coastal species.
Native to the western South Atlantic, it runs the full length of Argentina's Atlantic coast and into the Río de la Plata estuary, drawing shore anglers and boat fishermen alike.
Landings have declined significantly over recent decades, making responsible harvest increasingly important.
Scientific Name: Cynoscion guatucupa
Also known as pescadilla, corvinata, corvinata pescadilla
- Elongated, fusiform body with a silvery-blue back shading to a pale belly; faint horizontal stripes along the flanks give the species its common name.
- Large mouth with prominent canine teeth at the front of the upper jaw — a family trait of the Sciaenidae (drums and croakers) that helps distinguish it from similar coastal species.
- Typical catch runs 25–45 cm; larger adults can exceed 50 cm and are noticeably heavier-bodied than juveniles.
What to know
Habitat Distribution
- Native to Argentina's Atlantic coast; ranges from the Río de la Plata estuary south to roughly Patagonian waters, staying mostly within 50 m depth.
- A coastal demersal species — lives and feeds near the bottom but moves into the water column to chase baitfish; more oceanic in habit than related corvinas.
- Juveniles use estuaries like Bahía Blanca and the Río de la Plata as nursery grounds before moving to more open coastal waters as adults.
Key Locations
- Río de la Plata estuary — the primary spawning and nursery ground; supports both commercial and recreational fishing.
- Bahía Blanca estuary — well-documented juvenile habitat and a productive area for shore and small-boat anglers.
- Argentina's Atlantic coast from Buenos Aires province southward — the core of the adult population's range in nearshore coastal waters.
Specific Spots
- Estuarine channels and tidal flats where juveniles concentrate around structure and soft-bottom areas holding shrimp and small crustaceans.
- Sandy nearshore bottom in 5–30 m of water, particularly where current breaks concentrate baitfish like Argentine anchovy.
- Drop-offs and depth transitions along the coast, where pescadilla hold to intercept baitfish moving with tidal flow.
Stripped Weakfish FAQ
Answers from onWater's species guide.
What are the best lures and bait for Stripped Weakfish?
Small metal jigs and slender silver spoons are the most versatile choice, imitating the Argentine anchovy that adult pescadilla key on; work them with a slow lift-and-drop retrieve near the bottom.
When is the best time to fish for Stripped Weakfish?
Spring and early summer (September–December), fish become more active as water warms and juveniles move into estuaries. Late summer to autumn (February–April), adults concentrate near the Río de la Plata for spawning, making this a productive period for larger fish.
How do you catch Stripped Weakfish?
Most anglers target pescadilla from shore or small boats along the Buenos Aires coast and in the Río de la Plata, casting metal jigs or soft plastics toward the bottom and retrieving with a slow lift-and-drop.
What do Stripped Weakfish eat?
Juveniles feed heavily on mysid shrimps and small crustaceans, soft-plastic shrimp imitations or small jigs worked near the bottom cover this stage well.
Where do Stripped Weakfish live?
Native to Argentina's Atlantic coast; ranges from the Río de la Plata estuary south to roughly Patagonian waters, staying mostly within 50 m depth. A coastal demersal species, lives and feeds near the bottom but moves into the water column to chase baitfish; more oceanic in habit than related corvinas.
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