According to other online sources they say that photo is a hoax. Of course no one can confirm since he said he let it go.
Look at this guy holding a 100+ lb giant Siamese carp. If they said that thing was 30lbs and it's similar in size but that one looks bulky it seems a bit suspect, the guy holding it in the water have some trouble propping it up that high...
There's great website...Monster Carps. I can't paste the link for some reason. It hasn't been updated in years, but its all these pictures of gigantic carp that people have caught in Europe. They also have another site, Monster Catfish...