Fishing Wales: Identifying Salmon - Fishing Visit Wales

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The difference between Salmon and Sea trout

ATLANTIC SALMON FACTS - RECOGNITION

What should fishermen look out for particularly in connection with any salmon they catch?

Biologists who work with salmon often mark the fish that pass through their hands in any of the ways depicted below. Capture of a marked salmon should be reported at once to the appropriate fishery authority. Frequently the address is on the tag or mark. Usually the information required is: date, place and method of capture; length, weight and sex of fish and a sample of scales taken from between the dorsal and anal fins at above the lateral line.

How do you tell the difference between salmon and sea trout?

Salmon Sea Trout
General appearance Slender and streamlined More round and thickset
Head Pointed More round
Position of Eye Maxilla (bony plate usually alongside mouth) does not extend beyond rear rear of eye Maxilla extends beyond eye
Colour Relatively few spots Often heavily spotted
Scale count
(number from adipose fin to lateral line)
10-13 13-16
Fork of tail Usually forked Usually square or convex
Wrist of tail Slender Broader
Handling Easy to pick up by Tail Tail slips through hand
How to tell a salmon from a sea trout

How to tell a salmon from a sea trout
  1. TAIL FIN - When extended salmon have a concave tail. The sea trout's tail is convex or straight edged (when extended).
  2. WRIST OF TAIL - Salmon have a narrow wrist with distinct broadening on the tail side of the wrist. Sea trout have a relatively broad tail. This is particularly prominent in multi-sea winter salmon.
  3. MARKINGS - Salmon have relitively few dark spots below the lateral line. Sea trout have numerous dark spots.
  4. MOUTH - The jaw of a salmon extends no further than the rear edge of the eye. The upper jaw of a sea trout extends beyond the rear edge of the eye.