A portable refrigeration unit includes a drain tank having an open top. A grate is coupled to the top of the drain tank and covers the open top. A sidewall is upstanding from the drain tank. A top tray is coupled to a top edge of the sidewall. The top tray includes a recess and a plurality of drain holes. An ice basket includes a plurality of drain openings. The ice basket is removeably nested within the recess of the top tray. Shell fish are placed inside the portable refrigeration unit and rest on the grate. The ice basket is loaded with ice and placed within the top tray. As the ice melts, cold water drips through the ice basket and the top tray, and onto the shell fish. The cold water drains through the grate and into the tank.
