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Excerpt from On the Destruction of Fish and Other Aquatic Animals by Internal Parasites This communication is not intended to be an exhaustive memoir. The subject is a wide one, yet it may with truth be said that few persons are aware of its importance. As regards man and the higher animals, physicians and other professional persons have a direct interest in con ducting researches amongst the parasites; nevertheless, it is surprising to what an extent mere prejudice has operated to prevent labourers from entering into this instructive field of comparative pathology. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.
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Focusing on pathobiology and protective strategies against protozoan and metazoan parasites of fish, this book reviews the latest research on important parasites: those that cause financial hardships to the aquaculture industry, have been introduced to new geographical regions through transportation of infected fish, are pathogenic to groups of finfish and detrimental to production, are highly adaptable and not host-specific with worldwide distributions, and that may serve as disease models for studies on other pathogens. It also highlights gaps in the knowledge to help direct future research.
Excerpt from Common Parasites of Fishes Fish taken commercially, for sport, or raised by fish fanciers are sometimes found to be abnormal due to injury, deformity, disease, or the presence of parasites. This paper is concerned with common parasites of fishes and their recognition. Life cycles and biology are mentioned briefly, and references to more detailed literature are included. Parasites may be defined as animals that live on or in another animal, the host, at the expense of that animal. There are many kinds of parasites which may be found on the surfaces of fish, including the gills, as well as in the flesh and internal organs (fig. Those on the surface are known as external parasites, and those that live inside are called internal parasites. Several types may occur together in a single fish. Some parasites are fairly large (up to several inches) and can be seen easily, but many are microscopic. Scientists who work on parasites describe the organisms, study the life cycles (some have several intermediate hosts), survey the kinds and numbers found in fish, study damage done to fish, and attempt to control them. Re search is carried on by the U. S. Fish and Wildlife Service and some colleges and universities. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.