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The correct spelling of the scientific name is S. erythrophthalmus. Is it definitely a Rudd? I can't tell whether the mouth is upturned from the photo. The dorsal origin compared to the pelvic base, I often find hard to judge.
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It's definitley a Rudd, the mouth does turn upwards although it's not clear from the photograph. I do take notes with all of observations and am experienced enough to tell the difference.
I am not doubting your ability to tell the difference! It's just not always easy to agree, if you can't see it yourself, and the angle of the fish in the picture makes it hard to be sure of the mouth angle. :)
I know it's not a great photo which is why I'm saying it's definitily a rudd. Don't worry, I'm not getting into a rage over it. ;-)
After more years fishing than I like to admit to, this is one species for which I have never caught a decent specimen. I have just never fished anywhere where there were more than tiddlers. A shame, as a pound-plus Rudd is an amazing creature!
I understand that the Rudd has the dorsal fin set further back than the Roach, and that is what I seem to be able to see in your photograph so I opt for the Rudd
This looks like a Rudd to me.
On the Rudd the front edge of the dorsal fin is further back than the ventral fins.
On the Roach the two are almost aligned.
Lat/Lng: 52.613619, -1.145123
OS grid ref: SK579021