The Sea Trap is a Nautical Tab Item in the Shipwrecked DLC. It can only be used to catch Wobsters, requires a Science Machine to prototype, and 4 Palm Leaves, 2 Empty Bottles, and 1 Jellyfish to craft. It is also a reward from the Yaarctopus in exchange for Jelly-O Pop. Sea Traps act similar to regular Traps.
Sea Traps are set by placing them in the Ocean and can be picked up again at any time. They will move a bit of distance before settling completely when deployed.
Once set, Sea Traps can be baited with Food, which is attractive to Wobsters. Bait will be consumed upon a successful catch but will be given back if the player picks up the Sea Trap with the bait still in it. Once a Sea Trap has caught a Wobster, it will drop its hook with a cage, with the Wobster in the cage.
Sea Traps do not need bait in order to catch Wobsters; if a Wobster touches the Sea Trap for any reason, it will possibly catch it. This means if a Sea Trap is placed directly on top of a Wobster Den, it will catch the Wobster when it leaves home or comes back.
When a Sea Trap is picked up from the ocean and is still yet to catch a Wobster, no durability is lost, allowing it to be moved around freely. When a Sea Trap is picked up after catching a Wobster (or failing), it will lose durability.
Once a Sea Trap is placed, an icon will become visible on the map where it was placed.