Pour oil to a depth of 4 inches into a large Dutch oven, and heat to 375°. Fry potato strips, in 4 batches, 2 to 3 minutes or until golden. Drain on paper towels, and sprinkle with 1 teaspoon salt. Keep warm.
Sprinkle fish evenly with remaining 1/4 teaspoon salt and pepper. Combine cornmeal and instant potato flakes. Dip fish in melted butter, and dredge in cornmeal mixture.
Heat oil in Dutch oven to 400°; add fish, and fry, 2 fillets at a time, 2 to 3 minutes or until fillets float. Drain on paper towels; serve with chips.