YES! You can freeze this for up to 4 days and it'll still taste exactly the same. Or, you can freeze it for up to a month and it'll taste very similar, although not as fresh at just baked. Wrap the pie in saran wrap, then in foil, and then place in a freezer-safe zipped plastic bag. This ensures that smells and freezer burn will not affect your pie. When thawing, place in the fridge to thaw. Do not thaw on the counter as this will cause your crust to get soggy. If you have raw fish in your freezer, remove this first since this will be the first smell to seep into your pie.