biggest i had was a 26ib,which obviously taking into account what they capable of reaching is a small one but they was caught common enough in the particular lake i was fishing using typical carp set ups,funnily enough the one i had was on a zig rig popped up about 4feet in the water using a smokey mackerel boilie so not just bottom feeders as some are led to believe,they will come up for a bait.
fancied a trip out with yer man luke moffat years ago hitting the ebro but never did,good pic looks like its just been released,good luck targeting a big un
oh and i hear leeches are a kille