Editing Danube Delta (section)

==== Ecosystem of running water ====

This comprises the arms of the Danube, and a series of its more important streamlets and channels. It is an environment rich in [[plankton]], worms, [[mollusc]]s, [[Larva|grub]]s, and [[sponge]]s, with numerous species of fish, such as the [[carp]], [[pike (disambiguation)#Fishes|pike]], [[pike perch]], [[sheat-fish]], and freshwater [[sturgeons]] ([[sterlet]], Vyza{{Typo help inline|reason=Vyza? Please give Latin name|date=February 2021}}  and Danube mackerel{{Typo help inline|reason=Suspicious vernacular name. Please give Latin name|date=February 2021}}).