Great Machine you got there. I didn't know what a freeze dryer was before nowbut iI get the point now.
Answering your question, I don't know if this will work well with fish that has much oil and then us it to dry something like that, cause over here in Nigeria I us oven for that and I don't if this is better 🤷‍♀️
But you can try it out if it's not a problem.