Is it just me or does it look like a species of Gudgeon? there are a few common species knocking about but i am often seeing to odd unusual specimen cropping up too.
But.. Morgurnda(sp) or something?... im only going on shape alone but...
Here are two examples that made me think of that body shapy but might be too small...
Empire Gudgeon
http
/www.google.co.uk/imgres?q=empire+gudgeon&hl=en&gbv=2&tbm=isch&tbnid=OrxMi1UJJBYGKM:&imgrefurl=http
/www.aquariumlife.com.au/showthread.php/9811-Empire-Gudgeon-pics&docid=wuE1HkFEV0rg8M&w=1024&h=685&ei=0-9CTvOEKoKX8QO5lZTYCQ&zoom=1&iact=rc&page=3&tbnh=112&tbnw=184&start=24&ndsp=13&ved=1t:429,r:0,s:24&tx=102&ty=35&biw=955&bih=539
Purple Spotted Gudgeon - mogurnda adspersa
http
/www.google.co.uk/imgres?q=purple+spotted+gudgeon&hl=en&gbv=2&tbm=isch&tbnid=Uur-148gNMYW2M:&imgrefurl=http
/animal-earth.com/forum/index.php%253Fshowtopic%253D302&docid=P1lDkMvzdLjCgM&w=505&h=332&ei=VfBCTvSCDsGZ8QPPk6DfCQ&zoom=1&iact=hc&vpx=632&vpy=88&dur=2547&hovh=182&hovw=277&tx=182&ty=86&page=1&tbnh=119&tbnw=159&start=0&ndsp=12&ved=1t:429,r:3,s:0&biw=955&bih=539
EDIT: will teach me to read rest of the page! obviously not it... i have no idea what it is