You can make jerky out of just about any fish, fowl or red meat. I make catfish jerky a lot. I have not tried trout, but I have done salmon and steelhead while living in California.
As with many recipes (and other projects), you have to first decide what you want to end up with, and then work backwards. For example, if you like salty and spicy, then you need to either marinate the subject jerky material in an appropriate marinade, or else sprinkle it liberally with salt and seasonings before smoking and/or drying.
There are lots of inexpensive (and expensive) prepared marinades and spice mixes. Some of them are quite good. It is also easy to find a bunch of recipes on the Internet if you are handy with search engines.
For the drying part, you can use dehydrators if you want, but you can also use an oven. Just be sure, if you use an oven, that you drape the fish over wire racks (for even drying) and put foil underneath to catch the drippings. Depending on how fast you want to dry them, set the heat from 120 to 200 degrees. Higher if you are impatient. Thick fillets take longer, at lower temps. Thin fillets or small fish dry fast and thoroughly at lower temps. It takes some experimenting and watching.
I like smoke in my jerky. I do beef, chicken, turkey, goose, duck, pork and several species of fish. I do not marinate fish, but heavier fleshed items flavor better if you marinate them for up to several days in the refrigerator.
I have posted my SMOKED CATFISH RECIPE (with pics) before. It includes the list of spices and how I use them. Basically, I sprinkle salt, sugar and spices on the raw fillets and then smoke them until they are mostly cooked, and well flavored. Then, I remove them from the smoker and put them in the oven at about 160, on a foil lined cookie sheet, for another couple of hours. That makes them firm, but not quite jerky. To take them all the way to jerky might take another two to four hours. You gotta watch and test to get just the desired texture and consistency.
Trout are delicate fleshed fish. If you can leave them on the same wire rack throughout the entire process, you can fillet and skin them. But, if you scale the skin before filleting, you can leave the skin on to help keep the fillets intact. The skin is edible, and it is more difficult to pry the flesh off the skin once it has hardened and bonded during the jerkyizing.
That’s about all I know about that.