An example insect rearing system a vessel comprising at least one interior surface defining a volume; a liner comprising a liner material, the liner having a shape corresponding to a shape of the interior surface, the liner configured to be disposed within the volume to establish a cavity within which water, insect larvae, and insect larvae food may be disposed and maintained; and wherein the vessel defines an opening configured to receive the liner and to allow the liner to substantially conform to the shape of the interior surface.