4th link that came up on Google search...
Collins Bay wharf is good for pike, bass and pan fish.
Elevator Bay (Dupont / Invista) for carp, pan fish and at times, good pike.
1000 King St area behind buildings and townhouses for pike and bass.
Portsmouth Harbor used to be good at the end of the long wharf area and along it for pike and bass. I've caught some great fish pretty much all around this area and in the latter summer / fall, walleye will come into harbor in the evening.