Water runeys are one of the four types of Runeys from Rune Factory Frontier. They are blue on color and resemble water drops. They're the only type of Runey that doesn't get eaten by others. They eat Rock runeys and don't reproduce in large numbers. Water Runeys are more comfortable in places like Lake Poli and the Beach.
If the Water Runey population in an area is dying, simply place more Rock Runeys in the area. This shouldn't happen often since Water runeys are on the top of the food chain. Rock Runeys are easy to multiply if you use the technique in the link provided.
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