Yeah thats a pretty horrible play by jfish, way -EV.
Assuming hero has a hand that he will call jfish with 50% of the time, not sure on the figures but id guess somewhere around that as hero will probably call jfish a lot lighter seeing as he didnt 3bet the table fish in the first place.

50% of the time he will win $230 and 50% of the time he will likely be dominated in a $2400 pot.