Download Advances in Parasitology, Vol. 19 by W.H.R. Lumsden, R. Muller, J.R. Baker (Eds.) PDF

By W.H.R. Lumsden, R. Muller, J.R. Baker (Eds.)

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Extra info for Advances in Parasitology, Vol. 19

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A freshwater fish, therefore, would include copepods among its earliest parasites, whereas a marine fish would tend to become infected with them later in life. The differences are dictated by the respective sizes of the habitats involved. In more confined freshwater habitats the copepod has a chance of locating the fish when the latter is still unable to feed on intermediate hosts of other parasites. In the sea, these chances are smaller and the fish, in its search for food, actively accumulates those parasites that use food organisms in their cycles.

G. Pandaridae). There are, however, copepods which do not fit into the two traditional categories. These copepods, belonging mainly to the family Pennellidae, penetrate deeply into the tissues of their hosts, often reaching vital internal organs, but leave large parts of their bodies exposed to the external environment. Although in the past they were usually classified as ectoparasites, some doubts existed as to the validity of this view. Sundnes (1970) was prompted by these doubts to examine histologically the capsule formed by the host tissues around the embedded part of Lernaeocera branchialis.

The differences are dictated by the respective sizes of the habitats involved. In more confined freshwater habitats the copepod has a chance of locating the fish when the latter is still unable to feed on intermediate hosts of other parasites. In the sea, these chances are smaller and the fish, in its search for food, actively accumulates those parasites that use food organisms in their cycles. Dogiel’s and Polyanski’s generalizations contain a tacit implication that the copepod’s facility of locating the host is inversely proportional to the distances between them.

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