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Show 183 Further investigation may prove these micro- organisms to be the most abundant and diversified life in the Lake, especially near fresh- water inlets. Most of the species of protozoans in the Lake feed on bacteria. Corixids Members of the family Corixidae ( water boatmen) are found in the Lake waters, although they are thought to breed and hatch in fresher pond areas near the Lake ( Rees). They are medium to small bugs, usually less than 12 mm. long. Corixids are dark gray. They are often mottled with yellow, brown or black, and are found throughout the shallows of ponds, lakes and stream bottoms. Corixids are enveloped in a film of air and carry air trapped beneath their wings. Therefore, they rise to the water's surface for a new supply of oxygen when they are not swimming or clinging to some anchored object in the water. Other Invertebrates Scorpions and crayfish and numerous insects are also found around the Lake. See " Noxious Insects," p. 183, for a discussion of these invertebrates• NOXIOUS INSECTS I Noxious insects are defined as those which are annoying, irritating, pathogenic, potential vectors of pathogens, or which otherwise contribute to the ill health or discomfort of man or other animals. They were present in and around the Great Salt Lake long before man began to utilize it and will probably persist indefinitely. |