Preheat oven to 350 degrees F. Spray square baking dish, 8x8x2 inches, with cooking spray. Cut fish into 5 serving pieces.
In prepared baking dish, stir couscous, seasoning packet from couscous mix, water, oil, lemon juice, 1/2 teaspoon dill weed, zucchini, and yellow squash in baking dish. Place fish on couscous mixture. Sprinkle fish with 1/4 teaspoon dill weed.
Cover and bake 20 to 25 minutes or until liquid is absorbed and fish flakes easily with fork. Sprinke with pine nuts.