S and P works as does fresh rosemary. the lemon definately works. Are you trying to cook it or smoke it?
Cooked I like to put fillets over coals and never flip, scrape off skin when done.
Smoked is more indirect, I dont have a OTS but salt pepper and sugar rubbed on today, allowed to airdried tomorrow and smoked indirect, maybe 225 or so, until desired texture works.
Of course the best trout I ever ate was cooked over a campfire coals, spread over a mesh of vinemaple sucker branches, next to the water where I caught them.
Pete-my first UDS,a brick pizza WFO, a leaky Chargriller offest, wifes Weber Genesis gasser,a Lightening Fast RED Thermapen, new baby Traeger