water mite hydrachnidia and ostracod

water mite hydracarina hydrachnidiae zooplankton mites microorganism tiny insect aquatic invertebrates hydrachnidae decapoda freshwater life aquaculture biology macro microscope science microscopic microscopy closeup micro underwater bug ecosystem lake ostracod crustacean pond zoology zoological plankton planktonic fauna zoo floating crustacea scientific fresh micrograph microbiology crustaceans hydrobiology hydrachnidia light magnification 100 times objective