Abstract: An access structure, fabricated of a length of cylinder, having a flange provided at its bottom end, and a hinge door connected therewith, is provided for sliding insertion through an aperture located within the lid or cover of any compartment, such as an insulated box, other storage structure, or an ice chest; and a counterbalance spring holds the door to the bottom of the cylinder normally in a closed condition, but that under the weight of any fish or other aquatic animal deposited thereon, will open to allow deposition of such into the compartment for temporary storage.