316.8lbs for a specimen from the Po Delta in Italy
Thats a baby/ there was a documentry on uk tv last year where there was a dam in Germany and the older specimens were 3m+ (10 ft) and the record is from Ukraine, Almost 17 ft and some thing like 700pounds (high 600s cant remember exactly) see Manual of tankbusters.
I have mentioned this record before but many Americans dont seem to want to accept it (probably because it comes from a communist area).