Yep, you can freeze dry fish. The freeze dryer itself uses around 110watts and has to run around 12-18 hours for a single run. Here that amounts to around $2-$3 for one freeze dry run. The other benefit though is it gives off a good amount of heat so if you're in a colder climate it helps for heating your home as well! I haven't had to run my wood stove when I'm running this.