Put them in bowl salted water overnight at least, sometimes couple days later and change the water out, really gets all blood out and they are firm and cold. then put them in quart bags, freezer or not doesn't really matter as you then add water to cover, let air out till water comes out, seal. Good for several years if you need but we eat a lot of crappie. luckily I am catching lots of crappie and taking care of family and friends who love it too.
will look for vacuum sealer tho as freezer is filling up