Two fish anglers routinely mix up. Here is what actually separates them — and when and where you are likely to meet each.

Typical: 16–24 in, 2–5 lb
Quickest tell: The dark lateral line plus the black 'devil's thumbprint' over the pectoral fin instantly separate haddock from cod (pale/white lateral line, overhanging upper jaw) and from green forked-tailed pollock.

Typical: 20–32 in, 4–15 lb
Quickest tell: A greenish back, jutting lower jaw, near-absent chin barbel, and a clearly forked tail separate pollock from the barbeled, square-tailed cod and haddock.
Both run in Northeast — that is where telling them apart actually matters.