Rinse the trout thoroughly under cold water, then pat it dry with paper towels. Clean the inside of any remaining residue.
In a small bowl, combine the salt, pepper, garlic powder, smoked paprika, and brown sugar. Rub the spice mixture thoroughly over the outside and inside of the fish.
Place fresh thyme sprigs inside the trout, then drizzle with a little lemon juice and olive oil. Let it rest in the refrigerator for at least 1 hour to allow the flavors to meld.
Preheat the smoker to 190-210°F (90-100°C). Distribute the charcoal or wood evenly in the smoker to ensure long and even smoking.
Place the trout on a smoker rack or a special fish rack, and smoke slowly for about 2-3 hours, until the skin is golden brown and slightly crispy.
At the end of the smoking time, check the internal temperature of the fish, which should be at least 145°F (63°C) for proper doneness.
Carefully remove the finished smoked trout from the rack, and let it rest for 5-10 minutes to allow the flavors and moisture to redistribute.
Serve fresh with lemon wedges, fresh vegetables, or a light salad. It is also an excellent choice with toasted bread or steamed rice.
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