By W.H.R. Lumsden, R. Muller, J.R. Baker (Eds.)
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Extra resources for Advances in Parasitology, Vol. 19
Thus, the early part of the life cycle of Dissonus is more modified than the corresponding cycle segment of the more “advanced” Caligidae, all their affinities notwithstanding. (Anderson and Rossiter (1969) reported that they had failed to find any trace of the frontal filament. ) No comment has been made here on metamorphosis, frequently present during the preadult stage. This process, which is nothing more than the outcome of differential growth, will be discussed below with other aspects of biology.
Heegaard (1963) suggested that the patchiness of distribution of Clavella adunca might be due to the short life span of its dispersal stages, which are released from the egg sacs in clusters and are likely to result in multiple infections. Whatever the determinant factor, the commonly occurring increase in copepod burden and prevalence with the size of the fish is well attested. This situation, equally well known among parasites of other groups, has been recorded repeatedly in the literature of the last two decades.
The fish were of the same population, having been taken in the same net. Only three were infected, carrying eight copepods in all. Joy (1976) found a lowering in the infection rate of Leiostomus xanthurus with Ergasilus lizae Kroyer, 1863, as the fish became larger. 14 respectively. There are fairly numerous older reports illustrating the same situation. 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.