Unfortunately, Korean Pollack stocks have been all but decimated, so any pollack you see is probably imported. Most of the fishermen in Geojin now make their living from squid and crabs.
For some beautiful views of the coastline (such as where this photo was taken), take the stairs up the cliff at the north end of town. There is nice little hiking trail, exercise area, and beautiful views. It's usually deserted, so it's a good place to find some solitude, too.