In 12 inch cast iron skillet, heat coconut oil and sauté sliced carrots, onion, and fennel, with salt and pepper to taste, for 5 minutes. Add onion powder, garlic powder, ground ginger, red pepper flakes, and turmeric. Once spices are fragrant, add coconut milk. Cook for 3 minutes, until sauce thickens, then add trout, gently cooking it through, about 2 minutes.