Hihiwai (Neritina granosa) is a snail that was an important food source in Kaelepulu Pond. The snail is one of the three endemic fresh and brackish water snails found in Hawaii. The Hihiwai can grow up to 1-1/2 inches in diameter. Its shell can be rough or smooth. Hihiwai lives in lower and middle stream reaches. Its diet consists of algae from rock surfaces.
	During breeding, eggs are attached atop rocks and other Hihiwai shells. Egg laying usually occurs between June and August. Like the o'opu, the Hihiwai migrates between the ocean and the streams. When the eggs hatch in the streams, they flow downstream and spend about a year in the ocean and then they go back upstream. They are usually found in a single line.