When looking ast the position of the eye relative to the maxillary you have to take into account that the mouth is open in the photo and when closed the maxillary will be a little further behind the eye - so sea trout.
Also, given that there is a foil "chinese takeaway" container that appears to be under the fish, if it were a standard size and the fish was a salmon it would be tiny.
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“There is no more lovely country than Monmouthshire in early spring. Nowhere do the larks sing quite so passionately, as if somehow inspired by the Welsh themselves. There is a blackbird on every thorn and a cock chaffinch, a twink as they call him there, on every bush...... It moved me profoundly. I had been spared to see another spring, and I thank God for it.”
Oliver Kite
“A Spring Day on the Usk”
A Fisherman’s Diary
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