Haddock
The black thumbprint above each pectoral fin makes haddock one of the easiest North Atlantic bottom fish to identify — and one of the most consistently targeted from the Grand Banks and Gulf of Maine across to Iceland, Norway, and the British Isles.
Where cod tolerates a wider range of depths and bottom types, haddock tends to stack tighter over specific banks and ledges in 150–600 feet of cold water, which shapes how you fish for them: get heavy gear to the bottom, find the school, and work it vertically.
Scientific Name: Melanogrammus aeglefinus
Also known as Haddie, Scrod, Snapper
- The black 'thumbprint' — a dark blotch above each pectoral fin — is the single fastest field mark; no other common North Atlantic gadid carries it.
- Dark, unbroken lateral line runs the full length of the body against a purplish-grey back and silvery-grey flanks, with a white belly.
- First dorsal fin is tall and sharply triangular — noticeably more pointed than the rounded first dorsal of Atlantic cod, the most common lookalike; mouth is also smaller and doesn't extend back to below the eye.
- Most fish run 14–24 inches and 2–5 lbs; anything over 7–8 lbs is a big one, though the species can reach 44 inches and 37 lbs.
What to know
Habitat Distribution
- Native to both sides of the North Atlantic — western stocks concentrate on Georges Bank, the Gulf of Maine, and the Grand Banks; eastern stocks span the British Isles, Iceland, and Norway.
- Strictly a deep, cold-water bottom fish: most fish are found between 165 and 820 feet over rock, gravel, sand, or mud, with the bulk of the population holding between 260 and 660 feet.
- Rarely enters estuaries or shallow inshore water; in European waters, shore fishing is occasionally possible, but across the western Atlantic, reaching haddock almost always means an offshore boat trip.
Specific Spots
- Underwater banks and ledges where bottom topography creates hard edges draw schools — haddock use these contour breaks the same way freshwater fish use drop-offs, and marking fish on sonar before committing to a drift pays off at these depths.
- Gravelly and hard-bottom patches hold the crabs, worms, and urchins haddock root for; softer mud between hard spots tends to hold fewer fish, so moving until you're marking fish over the right substrate matters.
- When schools are stacked vertically in the water column during active feeding, staying directly above them and jigging straight down is more effective than a long drift — one fish in the column usually means more at the same depth.
Haddock FAQ
Answers from onWater's species guide.
What are the best lures and bait for Haddock?
Heavy metal jigs in the 6–10 oz range that imitate sand eels or small baitfish, tipping the hook with a strip of clam or squid adds scent and often makes the difference when fish are feeding close to the bottom rather than chasing.
What do Haddock eat?
Benthic invertebrates, crabs, worms, clams, sea urchins, and similar bottom-dwelling creatures, are the core of the diet, which is why clam and sea worm baits on bottom rigs consistently outfish presentations that don't reach the seafloor.
Where do Haddock live?
Native to both sides of the North Atlantic, western stocks concentrate on Georges Bank, the Gulf of Maine, and the Grand Banks; eastern stocks span the British Isles, Iceland, and Norway.
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