Thanks Dogghound - I said I didn't know much about the subject!
On my very few fishing expeditions when I was a boy in the 1960's I think I only ever caught very tiny rudd, roach and perch. They are really just names to me now, though I think I remember that Perch are striped.
I was just impressed with how clear the water was, and pleased that my camera was able to take a reasonable shot.
Thanks again!