apm299's picture

Salmo trutta

Observed: 9th September 2012 By: apm299
S159 Neighbourhood Nature - course complete
apm299’s reputation in Fish
Fish 01
Description:

Large fish in the river.

Identifications
Species interactions

No interactions present.

Species with which Rainbow Trout (Oncorhynchus mykiss) interacts

Comments

apm299's picture

Rainbow trout

Thanks Chris. Between seeing this large trout and the nearby mink, it proved to be an exciting day. Then again, perhaps I'm easily pleased.
Andrew

nightfly's picture

Two nice observation Andrew,

Two nice observations Andrew, better easily pleased than fussy! Some days one ob. is all you get. Your trout photo is a cracker, fish pics in habitat are probably the rarest of all on iSpot. This is a very good picture showing the build of a good condition rainbow trout, and quite a big one at that. Well done.

Cathal.

Thistle's picture

Identification

I suspect that Rainbow Trout in the River Tawe is very unlikely. Sea trout or Salmon (Salmo salar) is much more likely. At 2' long I would favour Salmon.

Note too the white lesions of ulcerative dermal necrosis. This occurs on salmon and sea trout; I've never heard of it on rainbow trout.

nightfly's picture

Hi Thistle,An awful lot

Hi Thistle,

An awful lot about this fish could suggest salmon- location, size, shape, presence of fungus on the head. It looks just as a salmon would do but the very fine speckling is only found on a rainbow trout as suggested by Chris above. But for the speckling being visible it would have been almost impossible to have brought this ID any closer than 'Salmonidae'.

Cathal.

nightfly's picture

As Chris says,The fine

As Chris says,

The fine speckling is typical of rainbow trout, Salmo trutta and Salmo salar are not finely speckled like this. Rainbow trout can be found in any water course in Britain that is connected to the sea. As long as they have access to the tide from where they are being reared or where they have been released, they can go wherever they like.

Fungus can appear on any salmonidae. At 2 feet long it could be any of the UK salmonidae species except for the small artic char of large deep lakes.

Cathal.

Thistle's picture

Rainbow

On checking, I'm surprised to find that the Tawe has been stocked with rainbows so perhaps it is one after all. Certainly the spots are more like that than a salmon.

chrisbrooks's picture

Rainbow

Thanks Cathal, I thought I was going mad. I think the size shouted Salmon but 2 feet for a Rainbow is not that huge either. The other thing that struck me was that it didn't look sleek enough for a salmon but that might be the angle etc. Regards Chris.

nightfly's picture

The thing is Chris, it looks

The thing is Chris, it looks like a salmon. Thats because rainbow trout and salmon are virtually anatomically identical when viewed as above. The significant difference as you pointed out is the fine speckling on its back. Hadnt that been so readily visible then what with the fungus around the head, it would have cried out salmon. To me the build looks spot on for a fresh run salmon, a 'nicely made fish' as they say, but build alone isnt going to differentiate a salmon from a trout as both are extremely variable. Its all about the spots in this case. Its a lovely pic.

Cathal.