Zooplankton
The zooplankton are an important link between the phytoplankton and higher trophic levels such as fish and mammals. Zooplankton constitute a diverse group of organisms with respect to size, life cycle and behaviour. The smallest size class, nanozooplankton (2-20 �m), are single celled organisms. The larger size class, the microzooplankton (20-200 �m) are dominated by ciliates and heterotrophic dinoflagellates, small metazooans as rotiferans and the earliest developmental stages of copepods. The largest size class, mesozooplankton (> 200 �m), consists of copepods, cladocerans and larvae of benthic invertebrates.


A micrometre (American spelling: micrometer, symbol �m) is an SI unit of length equal to one millionth of a metre, or about a tenth of the size of a droplet of mist or fog. It is also commonly known as a micron, although that term is officially outdated. It can be written in the expanded mathmatical notation (1�10-6 m)


0.00787401574804 of an inch = 200um