A slotted spatula is a kitchen tool with a flat, wide surface that has small holes or slots in it. It is used for flipping and lifting food, especially ones that have liquid or grease, allowing the excess to drain through the slots. Full definition
Carefully remove the steamer trivet from the pot and with a large slotted spatula, transfer the fish to a plate (best if served over steamed rice). (howtofeedaloon.com)