New PDF release: Advances in Parasitology, Vol. 19

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

ISBN-10: 0120317192

ISBN-13: 9780120317196

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All three are represented in the literature of the last two decades, though not to the same extent. A. HOST LOCATION AND RECOGNITION The problems of finding the host can be divided into those of long-range location and close-range recognition. The former are only a variety of problems faced by many animals and vary with the ecological conditions within which the host-parasite systems become established. (1951). Whereas the freshwater fish initially tends to acquire parasites with direct, one-host cycles, the marine fish first becomes infected with those that include intermediate hosts in their cycles.

I have seen infective females of Lernaeocera branchialis attempting, on contact, to grasp, with their second antennae, the wall of the cavity in a glass slide. Sproston (1942) commented on such juveniles of the same species attaching themselves to empty egg-strings of mature females, and even to artifacts. Here again the mechanisms involved remain completely unknown. It is not unreasonable to suspect that initial contact, by whatever means effected, is followed by definitive recognition, and acceptance or rejection, of the host.

There are strong indications that at least some lernaeid species have life cycles involving two hosts, whereas others have one-host cycles. Some might even be facultatively two-host parasites, although capable of completing their cycles on one host. Until recently, there was no suggestion that Lernaea changed its hosts during development ; it settled on its host during the first copepodid stage and remained associated with it for life. Perhaps this was due to the fact that most observations came from controlled environments used for the monoculture of fish.

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

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