Daphnia

Daphnia, also known as water fleas, are small aquatic crustaceans that are widely used in scientific research. They are a vital species in aquatic ecosystems, playing the role of both primary consumers and producers of food. Daphnia are important in the food web as they feed on algae and small invertebrates and are in turn preyed upon by fish, dragonfly larvae and other aquatic organisms. They are also an important food source for fish, with some species farmed as food for juvenile fish. Daphnia are often used in experiments due to their short generation time, easy availability, hardiness and transparency which allows the observation of internal organs and physiological processes. Studies of respiration, metabolism, chemical sensitivities and antimicrobial activity have been conducted using Daphnia. As a model organism, they have helped scientists to better understand the physiology and evolution of other organisms.