How to get the Golden Scale in Ocarina of Time

Adult Link can earn the Golden Scale by catching a fish at least 60 cm long in the Fishing Pond at East Lake Hylia. It matters because the item lets Link dive deeper, opening access to places such as the Heart Container Piece at the lakeside scientist’s lab.

Fishing costs 30 Rupees, and the article says players can keep trying after paying until they catch a fish large enough. Once they land one, they must choose to keep it and show it to the pond’s Fisherman to receive the Golden Scale; many players will already have the Silver Scale, which allows a medium-depth dive.