"Hearst Magazines and Yahoo may earn commission or revenue on some items through these links." A type of zooplankton, Daphnia pulex (a.k.a. the water flea) is a microscopic crustacean whose unique ...

The spiny water flea was discovered in Lake Winnipesaukee in September, marking the first time the aquatic invasive species has ever been detected in the Granite State, officials announced Friday.

Spiny water fleas, another foreign species believed to have crossed the ocean in the ballast of saltwater ships, has been confirmed in Shagawa Lake near Ely. The tiny creatures, which resemble a large ...

Phytoplankton is an important component of the food-web and is predated by a wide variety of aquatic organisms, such as water fleas, copepods and fish. These microscopic algae also play a crucial role ...

Nikon's Small World competition recognizes the art and science of microscope photography. This year's winning images reveal firing neurons, the vessels of leaves and eyeballs, and colorful crystals ...

Daphnia pulex (a.k.a. the water flea) is a microscopic crustacean whose unique reproduction habits make it the perfect species for studying evolution and natural selection. A new study looks at how ...