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.. the tail properly as if rounded would have confirmed P.platessa. However, the dorsal fin being well seperate and the starting appearance of spots suggests maybe a young Plaice. I actually think this is a Dab.
Lacks the distictive curve in the lateral line dianostic in dab, and has bony knobs on head so is likely to be a plaice
One of the peculiar things about this little flatty is that it appears to lack a lateral line altogether. The only thing which is familiar to me on this fish is the white tip/edge to the ventral and dorsal fins. I cant remember which flatty has it and it may be several.
Try blowing up the original image and you will pick up the rather faint lateral line
I had another look at it and I think I see the lateral line- its much easier to see near the tail. If it is it I can see near the head, it looks like there is quite an arch to it very like that of a dab. The shape of the fish (which isnt straightforward as it is draped over pebbles) is dab-like too. Hard to describe it correctly but the long straight tapering edges of the fish towards the rear is dab-like. I think it has been described as 'diamond shaped'.
It is an odd colouration for any flatty but I think its more dab lookng than plaice or flounder, I just wish I could test the texture of its skin with my finger to see...
Lat/Lng: 51.063, 1.085
OS grid ref: TR162338