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.
While it may take some practice, it is possible to catch Wobsters instantly by sailing towards them and deploying the trap such that it hits them as the trap glides forward. Placing one or more traps over the Wobster’s den can also guarantee a catch in case it attempts to retreat inside as you approach it with your boat.