In The Legend of Zelda: Ocarina of Time, the Golden Scale allows Link to dive up to 9 meters deep underwater.
This gives Link extra dive depth inside the tank at the Lakeside Laboratory, increasing your chances of scoring the Piece of Heart. You'll also be able to find more hidden items and secrets in underwater areas.
Want it? Here's how to get the Golden Scale.
How to Get the Golden Scale in The Legend of Zelda: Ocarina of Time
To get the Golden Scale, you'll need to catch a fish longer than 60cm in the Fishing Pond. You'll need to travel to Lake Hylia as Adult Link to do so. The lake is located in the south of Hyrule Field.
You'll notice that the lake is dry, and you won't be able to reach the Fishing Pond laboratory on your own. There are several ways to solve this. One way is to wait for Lake Hylia to be refilled by clearing the Water Temple. The other way is by riding the magic bean plant (that you need to have planted as child Link next to the laboratory). Alternatively, you can play the Scarecrow Song on your Ocarina by the bridge at the front of the building.
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Once inside the building, talk to the Fishing-Pond Man and rent a fishing rod for 30 Rupees. This will allow you to fish as many times as you want. For better chances of catching a large fish, aim for the middle of the pond.
Catching a fish longer than 60cm requires some patience - they resist more than smaller fish. Make sure to keep moving the rod in the direction the fish is pulling. If your fish is too small, you can toss it back and keep trying until you get one large enough.
Once you get a fish over 60cm long, keep it and return to the Fishing-Pond Man. Tell him you're done, and he will examine your fish. If you've done this correctly, he will bestow you the Golden Scale.
For more like this, check out how to get Ice Arrows in the Ocarina of Time Remake.