Daphnia species . They are found in huge numbers in the lakes. There are several species in our lakes - this one is most commonly seen in spring.
Daphnia give birth to live young, but the eggs are incubated in a brood pouch.
Daphnia are herbivores, they eat small green algae and are eaten by carnivores such as the Phantom Midge Larva . This is where the baby Daphnia grow. You can have a closer look at the brood pouch here. . On the right is a closer view of the daphnia's head.