Sea creatures are a new collectible in Animal Crossing: New Horizons after the first update. You can meet them in the sea and you have to dive into the ocean to find them. Before jumping into the ocean, you must swim and dive into the water. To do this, you'll need a particular item, which you can buy from the Nook's Cranny, or buy one from the Nook Miles terminal.
The gear you want to buy from the Nook Shop or Nook Miles Terminal is the Drysuit. You can find it available at the Nook Shop for 3000 Bells, or you can use 800 Nook Miles for the Nook Inc-themed one. ocean on any side of your island. You cannot jump into the river. Facing the sea, press the A button on your Nintendo Switch to enter the water.
To find sea creatures, you look for bubbles in the water. You should see it slowly rise to the surface, and when you approach bubbles, press the Y button to dive. While exploring the bottom, you want to direct your character towards the dark water shape to grab it. You will then rise to the surface to show off what you have found. You can capture 40 sea creatures, some of which are seasonal.
