For fried seafood the BEST by far is the Clam Box in Ipswich right on Rte 1A....I love their food which is amazing since I did not eat fried seafood before discovering this restaurant. Just a note...in the summer there is always a line and they change their cooking oil every day at 2 p.m.
I like both locations of New England Seafood. They're located @ Merrimack & Pelham Streets respectively. Another great place is Joe Fish in North Andover, MA. There is my 2 cents. Try these locations, you'll love the food.