The Oarfish can also only be caught at the sea, meaning the best and the only location would be to capture it by the beach. This applies to the player's very own island, other players' islands or by participating on a Nook Tour to other islands.

Where can I catch Oarfish in real life?

Oarfish are a pelagic species found throughout the deep seas of the eastern Atlantic Ocean and Mediterranean Sea. They are usually found at a depth of around 600 feet (200 meters), although they have been known to go as deep as 3,000 feet (1,000 meters).

Where do Oarfish spawn Animal Crossing?

Oarfish Animal Crossing: New Horizons

Players will find that the Oarfish will spawn in the sea, so those interested in obtaining this aquatic creature will need to visit the sea surrounding on your island or someone else's island. However, players can not find these creatures in the sea at any time of the year.