There is nothing like fresh fish on the trail. Period. You can carry a lot of stuff to prepare the fish you might catch. For example, I like rainbow trout prepared whole, with a little onion, salt, pepper, and butter (substitute Butter Buds or ghee on the trail). Wrap them in foil and lay on the coals for 10 minutes per side. Flaky and delicious.
But then you might not catch anything, and carry around the extra stuff. And you might not have the luxury of a fire. Simple might be better. A little oil. Some salt and pepper. A pot is cumbersome but will work. A lightweight frying pan works better.
For a recent trip to Isle Royale National Park we used the minimum option. In this case it was perch and pike. Keep the oil hot and no breading is needed to keep the fish together. Just add a little salt and pepper or lemon pepper. Excellent. Take extra care with pike when you eat it, as it is much bonier.