Abstract: An aquaculture tank system includes: an aquaculture tank configured for holding a liquid and at least one first animal therein; and a cover coupled with the aquaculture tank for covering the liquid, the cover including a sheet-like central portion with a plurality of openings, at least some of the openings being sized and configured for providing a dual functionality of: (a) allowing an animal feed to pass therethrough in order to feed the at least one first animal in the aquaculture tank; and (b) preventing at least one second animal located exterior to the aquaculture tank from removing the at least one first animal from the aquaculture tank.