[thesharpie]

I raise now because the TAG is thinking you'll raise the flop with something worse than he has, if you wait til the turn he might be able to find a fold. The fish is probably coldcalling with any pair anyway, right? And you wouldn't want him calling a single bet on the flop with a pair since he's making a profitable call, the only reason to call on the flop is to hope the fish calls with junk, but often he'll have undercards and it should be hard for him to peel those, however it's easy for him to peel with a pair.