No reason why it cant be a sea trout?
(no expert on fish)
Its rather large for a rainbow.
You mean apart from it
not being a sea trout? No reason that an Ash can't be an Oak....to someone for whom all trees are just green scenery.
The huge great pink stripe down the side is kinda a give away, in neon, with bells.
Male rainbow trout, not sure of weight, lets call it 8lb (if I was more of a fisherman I might say 10lb
)
DSC03433 by
Last Scratch, on Flickr
Female rainbow trout
IMG_0417 by
Last Scratch, on Flickr
Brown Trout
IMG_0901 by
Last Scratch, on Flickr
DSC03414 - Copy by
Last Scratch, on Flickr
Sea trout are brown trout, and even though much more silvery, they do still have the spots, and do not have the big pink stripe!
As for size, world record rainbow is 48lb. That is a trout born in a farm, but that escaped into a natural lake where it grew on natural food, but since it could not reproduce, all energy went into growing large. I won't say all farmed rainbow in the UK are similarly manipulated, but it is very common.
The same isn't true for trout in the Twizel area canals in New Zealand. They are not genetically sterile, and grown on their own in the canals, not stocked at great size, but in addition to natural forage, they can pick up food that is washed out of the salmon farms there. They get huge too.
https://fishingmag.co.nz/south-isla...twizel-canals-fishing-tips-ohau-pukaki-tekapo