Coat a baking pan with canola oil spray and lay fish on the pan. Sprinkle with salt and pepper, and drizzle with olive oil. Bake for 15 minutes; let cool.
While fish bakes, boil potatoes for 12 to 15 minutes, until tender; let cool. Place potatoes in a large bowl and mash them until smooth.
Add fish, parsley, lemon juice, mustard, egg, salt, and 2 tablespoons of bread crumbs to potatoes and combine well. Divide mixture into 8 patties and set aside.
Place remaining bread crumbs in a shallow bowl. Dip patties in the crumbs, turn, fully coat, and place on a baking pan coated with canola oil spray. Bake for 6 minutes, turn over, and bake an additional 5 minutes.