Professor

The Lake Scientist is a character in and.

Ocarina of Time
In, the Lake Scientist is an eccentric scientist who lives in the Lakeside Laboratory located above Lake Hylia. He is a chemist, putting his knowledge into medicinal practice at his laboratory. When Link first meets the scientist, he mentions a mutual friendship with Granny, who is the old lady who runs the Potion Shop of Kakariko Village.

The pool in his laboratory is eight meters deep; he will watch Link dive and make remarks based on the depth he reaches. If Link can touch the bottom of the pool, he will give him a Piece of Heart and tell him he is the best diver in the world. Link needs a Golden Scale to do this, however.

The Lake Scientist is a part of the Biggoron's Sword Trading Sequence. After an Eyeball Frog is given to Link by King Zora, he must rush down to the laboratory and give it to the scientist. At first, he excitedly thinks the frog is for making fried eyeballs, which he finds delicious, but Link corrects him and explains he brought the frog because of its medicinal properties. The Lake Scientist creates a solution of Eyedrops for Biggoron from the Eyeball Frog.

Majora's Mask
In, he is referred to as the Professor, and works at the Marine Research Laboratory as a marine scientist at the Great Bay. He takes care of Lulu's Eggs by keeping them in a special tank until they hatch. The Professor says that if the Zora Eggs are not kept in the specially-made aquarium, they may die, due to the abnormal weather patterns causing a rise in the ocean's temperature. He also raises Fish to deal with the shortage resulting from the rising temperature in the ocean, feeding them other Fish to do so, which does not sit well with some Zoras.

Ocarina of Time and Majora's Mask Manga
In the, the Lake Scientist, known as Dr. Mizumi, is introduced after Link encounters a nearly drowned Rouru in a lake, and decides to bring the Watarara to Dr. Mizumi. Mizumi offers to let Rouru stay at his laboratory until he recovers. Soon after though, Rouru has a fit and destroys most of the doctor's experiments and equipment. After Rouru is healed, he leaves with the rest of his flock and Link offers to help rebuild the life work of Mizumi.

In the, Dr. Mizuumi appears as a fisherman. He mistakes Link for the Zora, Mikau, since he is wearing the respective mask. Link gives him Lulu's egg for safe keeping and study.

Etymology
is the Japanese word for lake.

Trivia

 * Dr. Mizuumi's name is misspelled with one U (Mizumi) in the Ocarina of Time manga.
 * The Lake Scientist resembles Dr. Borville in, indicating a possible connection. However, Borville seems to hate Zoras, unlike the Scientist, who helps and lives near Zoras in both of the aforementioned games.