By W.H.R. Lumsden, R. Muller, J.R. Baker (Eds.)
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Extra resources for Advances in Parasitology, Vol. 19
Kabata (1972) found only one such stage in the life cycle of Caligus clemensi, but this work, being a reconstruction from in vitro material, was open to errors. Izawa (1969), on the other hand, failed to find chalimus IV stage in Caligus spinosus, though he reported two preadult stages. It is very likely that he and Kabata both missed one stage and that all caligid life cycles have nine stages in addition to the adult. Hewitt (1964) described three “preadult stages” in a caligid cycle. However, his observations on Lepeophtheirus polyprioni Hewitt, 1963, did not prove the existence of moults between them.
A chemical attractant released by the original settler and adsorbed on the substrate. An interesting suggestion, still requiring corroboration. All that can be said at present is that it has not been proved unfounded in the 16 years since it was put forward. One of the reasons for the clustering of some parasitic copepods can be found in the solitary habits of their hosts. When only isolated individuals of the host species are available for the parasite’s settlement, the best strategy might be reinfection of the host harbouring the maternal parasite by the offspring of that parasite.
To quote but a few examples: Walkey et al. (1970) reported an increase in infection of Gasterosteus aculeatus by Thersitina gasterostei with the size of the fish. Bortone (1971) and Bortone et al. (1978) noted a heavier burden of Ergasiha manicatus Wilson, 1911, and Bomolochus concinnus Wilson, 1911, on larger Menidia beryllina and M . peninsulae, while Hanek and Fernando (1978c, 1978d) found the same in the association between Lepomis gibbosus and Ambloplitis rupestris, on the one hand, and three copepod species (Achtheres ambloplitis Kellicott, 1880, Ergasilus caeruleus Wilson, 1911, and E.