By P. T. K. Woo

Fish is the significant resource of protein for individuals in lots of components of the realm, rather in constructing international locations. whereas such a lot fish are stuck from nature, aquaculture or fish farming is now creating a major contribution to overall fish creation. extra in depth stipulations of aquaculture frequently lead to a better prevalence of fish illnesses and problems. As within the first variation, the focal point of this moment variation is on protozoan and metazoan parasites that reason illness in fish. major alterations to this moment variation contain the addition of three new chapters and four of the unique chapters have new authors.

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Extra resources for Fish Diseases and Disorders: Volume 1: Protozoan and Metazoan Infections

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Pillulare (Lom, 1981) or P. limneticum (Jacobs, 1946). J. G. , 1991). G. F. Poore, A. J. W. Litaker, unpublished data), making the usefulness of this feature uncertain. e. not having plates or ‘armour’), making them of the gymnodinoid type. However, improved ultrastructural techniques led to the discovery that dinospores collected from redfish (Sciaenops ocellatus) and presumably originating from the Gulf of Mexico, Florida, USA, and parasites collected from an aquarium in Florida having an amyloodiniosis outbreak both had the same type of delicate plates.

Trophonts are bounded by a cell wall with a thin, resistant, pellicular envelope. Beneath the cell membrane is a layer of flat amphiesmal vesicles, as is found in free-living dinoflagellates (Dodge and Crawford, 1970). Various organelles, including chloroplasts, mitochondria, Golgi apparatus, trichocysts and mucocysts, may be present. Trophonts have a prominent stalk (Fig. 4), a cytoplasmic evagination with holdfasts that anchors the parasite to the host and in some cases absorbs nutrients. The stalk is a characteristic of oodinid (and blastodinid) dinoflagellates.

Syndinid dinoflagellates The syndinids include intracellular parasites and those that inhabit cavities. Ichthyodinium Hollande and Cachon, 1953 (I. chabelardi Hollande and Cachon, 1953) was classified by Taylor (1987) as a member of the subclass Syndiniophycidae, order Syndiniales, family Syndiniaceae. However, molecular studies will be needed to confirm its taxonomic placement and determine whether one or several species are involved. 23 Unclassified dinoflagellate The stickleback parasite from British Columbia has not yet been classified.

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