The place in Estevan is called The Galley, and it's decent with a good classic feel. The best in Victoria is, by far, Red Fish Blue Fish. This is coming from a person who will die of a fish and chip overdose one day. A guy who's wife has asked, with tears in her eyes, that I don't get fish and chips again for dinner. I am a serious fan. Another really good option is the Penny Farthing in Fairfield -but it's a pub. They do have two for one fish and chips once a week though, so you can have double!
As for Barbs, I have watched it decline over the years. As a commercial fisherman I was based out of that warf, and I must say, Barb's isn't great. For example, they use frozen fries rather than making their own. As a matter of fact, my missus worked there for a long stretch, so I know from the inside that the quality is variable.
Go to Red Fish Blue Fish, it is really good. And always local caught fish. Their slaw is a little weird, but everything else is fantastic!