We found ourselves in Flanders, CT today, and on the advice of some locals, tried the Flanders Fish Market restaurant. Delicious chowder (the creamy kind), fried flounder and lobster pot pie plus lots of other likely looking goodies we didn't try. Just as good (perhaps better) than our previous benchmark, Lenny and Joes Fish Tail in Westbrook.
Only (minor) complaint was that the cole slaw could be improved. Try it out. It is located at 22 Chesterfield Rd (Rt. 161) just north of Rt. 1 (Boston Post Rd) (1/2 mi north of I-65). Also has an extensive raw fish take out counter.