i think its very difficult to gauge the size of barbel , to give the capture credit , its dark .. i often look at pictures of fish and think that they are not the size they state they are this fish i caught last year went 15.4 and i think it looks bigger , i could of said its 19 and would be only cheating myself .. i witnessed a 16.8 on the bank last jan and this looked smaller than my fish in the photos !! , also taking into account how big the person who caught it is ! im 6.4 , if you had someone that was 5.6 and 9 stone it would look massive !! so what im saying is very hard to estimate a fishes weight given all the factors .. whatever size it was its still a great fish so well done