By W.H.R. Lumsden, R. Muller, J.R. Baker (Eds.)
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Extra info for Advances in Parasitology, Vol. 19
I have adopted terminology aimed at elimination of the confusion still existing in labelling individual stages. Nauplii have been numbered I-V and the term metanauplius has been dropped. The postnaupliar stages, beginning with the first copepodid and ending with the last stage preceding the preadult, are clearly affected by the beginning of metamorphosis in some instances and display an advanced stage of sexual maturity in all. These have been named according to their mode of life; those that remain free-swimming and show no extensive organogenetic changes foreshadowing parasitism, are designated by the name copepodid and numbered I-V.
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. How does the copepod locate the fish ? We are still floundering in assumptions and speculations which assign to various “tropisms” the guiding role in bringing the fish and the copepod together.
This behaviour suggests that the requirements of the parasite change with its growth and maturation, even when it is destined to become sedentary as an adult. Very few copepod species are so narrowly specialized that they are unable to survive in a habitat other than their sites of predilection. Although they will preferentially colonize their target sites, once these sites are fully occupied they often spill over to other, less suitable sites. Walkey et al. (1970) found this to be true for infections of Gasterosteus aculeatus with Thersitina gasterostei, but it is equally true of most species, particularly those freely mobile over the surface of the host.
Advances in Parasitology, Vol. 19 by W.H.R. Lumsden, R. Muller, J.R. Baker (Eds.)