I thaw a fillet or 2 out. Cut them into bite size pieces. Feed some to fish. Put the rest back in a ziplock bag with all air & moisture squeezed out. Then I get another ziplock bag. Put about 10 ice cubes in this bag. I then put the bag of cut fish in a small plastic container and then rest the bag of ice on top of the fish. Then I put the plastic container in the fridge with the ice kissing it at all times. When I need some fish, I take some out and rest the bag of ice right back on the fish. I replace the ice cubes when needed, they last a long time in the fridge. As long as ice is kissing the fish, it will last for days and days! No foul odor for a looong time