Leeches, lice and lampreys : a natural history of skin and by Graham C. Kearn

By Graham C. Kearn

Many other kinds of animals have followed a parasitic lifestyle at the epidermis and gills of marine and freshwater fishes, together with protozoans, flatworms, leeches, a number of crustaceans or even a few vertebrates (lampreys). there's a parasitic barnacle, defined first within the nineteenth century via Charles Darwin, fish lice that vary intercourse and bivalve molluscs parasitic in basic terms while younger. This booklet explores for the 1st time in a single quantity, the striking biology of those little recognized and often extraordinary animals.

The following heavily interwoven subject matters are thought of for every workforce of parasites: how they locate their hosts, how they connect, feed and reproduce, the wear they inflict and the way the host’s immune process retaliates. in line with the British fauna, yet extending the place acceptable to examples from North the US, Australia and somewhere else, the e-book is key interpreting, not only for the pro parasitologist, but additionally for someone attracted to fishes and during this overlooked box of British common background.

With the enquiring naturalist in brain, phrases and ideas are defined as they come up, subsidized up through a thesaurus, and the textual content is liberally illustrated. An introductory bankruptcy on fish biology units the scene and customary fish names are used all through, in addition to medical names.

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Extra resources for Leeches, lice and lampreys : a natural history of skin and gill parasites of fishes

Example text

The whole body surface and fins of a fish are exposed to water-borne parasites and pathogens, as are the gills and the sensory epithelium of the nostrils. As portals of entry for potentially harmful organisms the skin and the gills differ significantly in importance (see review by Evelyn, 1996). The gills are particularly vulnerable because of the functional need for a large surface area and minimal separation between the fish’s blood and the water passing through the gill. In fact only a single layer of fragile epithelial cells separates the blood and water (see above).

Every major group of fish-like vertebrates is parasitised by monogeneans. One of the two sub-divisions of the Monogenea, the Monopisthocotylea, includes a range of skin parasites, but there are many other monopisthocotyleans living on the gills. Members of the other sub-division, the Polyopisthocotylea, are with few exceptions gill parasites. e. the monophyly of the Monogenea has been questioned (see Chapter 6). Monogeneans have been recorded on ‘primitive’ jawless agnathans, on holocephalans, on the coelacanth, Latimeria chalumnae, and on sturgeons.

Granules within the scopula may be secretory bodies containing the adhesive. The scopula of a scyphidiid from the surface of a mollusc also appears to have secretory ability (see Lom & Corliss, 1968). Occasionally Pickering et al. (1985) found two specimens of Scyphidia sp. sharing a common platform of cement on the surface of brown trout. They interpreted these as daughter cells produced by division of one parent individual. They also observed numerous unattached free-swimming stages (telotrochs), which are presumably responsible for infecting new hosts, but these stages were not studied.

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