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

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

ISBN-10: 0120317192

ISBN-13: 9780120317196

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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. If they have become attached and enter the stage of “regressive reconstruction”, they are given the name chalimus. There are never more than four chalimus stages and they are numbered accordingly. The next cycle segment, the preadult, is that part during which the copepod either settles definitively on the host and enters a period of metamorphosis, or attains its definitive level of organization, released from the protective restraint of larval semi-permanent attachment.

Noble et al. (1963) studied the gill parasites of Gillichthys mirabilis, one of the species being Ergasilus auritus Markevich, 1940. They found that the number of infected fish increased with length from 70 to 120 mm, but dropped steadily thereafter. A suggestion was made that the reduction was due to the development of immunity. For the two-host cycle copepods of the family Pennellidae, the difference in the pattern of infection might be produced also by differences in the availability of intermediate hosts.

Nectobrachia indivisa, not a member of this branch but sharing with its members the abbreviated condition of the male, shares with Clavella also the type of life cycle (Wilkes, 1966) (Fig. 5F). In this type of cycle, the single nauplius is free-swimming. It moults into a copepodid, which is the infective stage. ” There are no more moults and the pupa becomes an adult by continuous metamorphosis. Heegaard’s pupa can, therefore, be equated with the preadult, as defined here. A life cycle with a pattern unusual among copepods parasitic on fishes is 24 2.

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


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