
Über Thetareihen Zu Großen Untergruppen Der Rationalen Modulgruppe
W. Hans H. Petersson
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A Natural History of Skin and Gill Parasites of Fishes
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Many different kinds of animals have adopted a parasitic life style on the skin and gills of marine and freshwater fishes, including protozoans, flatworms, leeches, a range of crustaceans and even some vertebrates (lampreys). There is a parasitic barnacle, described first in the 19th century by Charles Darwin, fish lice that change sex and bivalve molluscs parasitic only when young.
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