Twaite Shad
Twaite shad are anadromous members of the herring family that spend most of their lives at sea before pushing into rivers each spring to spawn. In Ireland, the River Barrow at St.
Mullins is the undisputed centre of shad angling — drawing anglers from across the country for a narrow seasonal window that's part fishing trip, part annual tradition. Acrobatic and hook-shedding, they're unlike anything else in Irish freshwater.
Scientific Name: Alosa fallax
Also known as Shad, Twaite
- Deep, compressed body with a sharp keel of spines along the belly — herring-shaped but noticeably deeper-bodied than a herring or sprat.
- Silvery flanks, sometimes with a bronze tint; bluish-green back; gill covers with a distinctive gold-bronze metallic sheen and radiating ridges.
- A row of six to ten large dark spots running behind the gill cover along the upper flank — the clearest field mark separating twaite shad from the rarer allis shad, which typically has fewer spots.
- Typical fish run 25–40 cm; the Irish record is 1.64 kg, with specimen qualifying length set at 50 cm.
What to know
Habitat Distribution
- Native to Ireland; a coastal and estuarine species for most of the year, entering rivers only to spawn in late spring and early summer.
- In Ireland, concentrated in the southeast — the Barrow, Nore, Suir, Munster Blackwater, and Slaney river systems, with the Barrow holding the most significant remaining population.
- A landlocked subspecies, the Killarney shad, is endemic to Ireland and found only in the Killarney lakes — it is not a target for anglers.
- Classified as vulnerable in Ireland, with conservation status assessed as bad and deteriorating; listed under the EU Habitats Directive.
Key Locations
- St. Mullins, River Barrow, Co. Carlow — Ireland's primary shad fishery; fish stack below the weir on the spring tide run each May.
- The tidal River Barrow from the estuary upstream to St. Mullins weir — approximately 14 miles of tidal water that shad navigate during the run.
- River Nore — a Barrow tributary where shad are also known to run to spawn, though in smaller numbers than the main Barrow.
- The Suir, Munster Blackwater, and Slaney systems are designated SACs for shad, indicating historical and ongoing presence, though the Barrow remains the most productive for anglers.
Specific Spots
- The tidal stretch of the Barrow below St. Mullins weir is the primary target zone — shad stack up here because the weir blocks further upstream migration.
- Fish move on the flooding spring tide, so timing your session to coincide with the tide pushing upriver is more important than any particular bank position.
- Deeper holding pools in the tidal reach concentrate fish between tidal movements; shad shift into shallower, faster water to spawn mainly after dark.
- The car-park section downstream of the weir is a well-known access point where anglers line the bank during the peak run.
Twaite Shad FAQ
Answers from onWater's species guide.
What are the best lures and bait for Twaite Shad?
The Tasmanian Devil spinner is the most established shad lure at St. Mullins, typically fished on a modified rig with the factory trace replaced by fluorocarbon to allow the lure body to slide free after the strike.
When is the best time to fish for Twaite Shad?
Late April to mid-May is the peak window, when the main run pushes up the Barrow on spring tides. The run is typically over within a few weeks; by late May or early June most fish have spawned and dropped back toward the estuary.
How do you catch Twaite Shad?
Almost all shad angling in Ireland is done from the bank on the tidal Barrow at St. Mullins, casting small spinners and spoons across and downstream into the current on a flooding spring tide.
What do Twaite Shad eat?
At sea, twaite shad feed on invertebrates, plankton, and small fish. During the spawning run in the Barrow they are not actively feeding to any great extent, but will still strike at small, flashy lures, reaction bites rather than hunger.
Where do Twaite Shad live?
Native to Ireland; a coastal and estuarine species for most of the year, entering rivers only to spawn in late spring and early summer. In Ireland, concentrated in the southeast, the Barrow, Nore, Suir, Munster Blackwater, and Slaney river systems, with the Barrow holding the most significant remaining population.
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