Lake Scientist
"Daily trying to get to the bottom of the mysteries of Lake Hylia!"
The Lake Scientist, also known as Dr. Mizumi, as a character from Ocarina of Time that resides in the Lakeside Laboratory and lives out his days studying marine biology.
Biggoron's Sword
At the Lakeside Laboratory, while Link is in the midst of acquiring the Biggoron's Sword, he finds that he needs the Eyeball Frog to create Eye Drops for Biggoron. After receiving it from King Zora XVI at Zora's Domain, he must bring it to the Lake Scientist on horseback for increased speed, as the Eyeball Frog spoils quickly.
Heart Piece #28
- Main article: Ocarina of Time Heart Pieces
Once you win the Golden Scale from the Fishing Pond, you can enter the Lakeside Laboratory and use it to dive down as far as you can. Link will touch the bottom and you'll hear the Zelda chime. The Lake Scientist will be watching Link's diving secretly, and he will be so impressed that he rewards Link with Heart Piece #28.