ABSTRACT There is provided an apparatus and method of filleting and cleaning a cephalopod, including squid. It has been found by fishermen that cephalopods are difficult to fillet and clean because the ink sac is easily ruptured resulting in the thick viscous ink coating the mantle and hands of the person cleaning the seafood. Furthermore, it is advisable to turn the mantle of the cephalopod inside out to thoroughly clean the seafood, however this can be a difficult task because of the slimy texture of the squid’s body. Accordingly, the apparatus of the present invention includes, a generally planar body having a first end being shaped for insertion into a cavity of a mantle of said cephalopod and a second end graspable by a user, a forwardly facing cutting member located at, or adjacent, said first end, for severing an internal membrane of said cephalopod, said cutting member intermediate of spaced apart first and second guide portions, wherein upon insertion of said first end in through an opening of said mantle, the first and second guide portions act to constrain the movement of the cutting member such that it is directed along or adjacent a junction between said internal membrane and an inner surface of said mantle, to thereby detach the internal membrane therefrom, wherein at least a part of said first and/or second guide portions extend forward of said cutting member to inhibit the mantle or internal organs of the cephalopod from being perforated or ruptured by said cutting member, the first and second guide portions include respective leading ends having a grip member that has a textured or uneven surface to assist in the inversion of the mantle thereover.