Both species are sometimes confused. Lateral line is easiest way to distinguish between the two species.
Coalfish
Straight lateral line as seen below. Totally straight with no curve.
Pollock
Curved lateral line as opposed straight on a Coalfish.
Dogfish
Bullhuss
European Eel
Conger Eel
Herring
Allis and Thwaite Shad
Poor Cod
Pouting
Long Spinned Sea Scorpion
Short Spinned Sea Scorpion
3 Bearded Rockling
5 Bearded Rockling
Shore Rockling
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Ballan Wrasse
Corkwing Wrasse
Goldshinny Wrasse
Rock Cook Wrasse
Cockoo Wrasse
Baillons Wrasse
Flatfish
Flounders and plaice are often mistakenly identified. Flounders can have spots which can add to the confusion. Turbot and Brill also look very similar.
Dab
Curved lateral line as highlighted in photo below.
Skin rough over whole body.
Relatively large eyes
Can be see through when held up to light.
Flounder
Larger tail than plaice
No boney ridge on head.
Rough lateral line when running hand up and down.
Can have spots but usually less prominent than plaice.