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The life histories and population dynamics of monogenean gill parasites of Trachurus trachurus (L.)

Published online by Cambridge University Press:  11 May 2009

J. Llewellyn
J. Llewellyn
Affiliation:
Department of Zoology and Comparative Physiology, The University, Birmingham 15
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Extract

Gastrocotyle trachuri and Pseudaxine trachuri infect young Trachurus trachurus at Plymouth as soon as the 3- or 4-month-old adolescent fishes descend to the sea bottom in October. The parasites normally mature in 3 or 4 months, but, exceptionally, in about 1 month, and the life-span is normally no longer than 1 year. Trachurus specimens at the beginning of their second year pick up a largely new infection of parasites.

G. trachuri and P. trachuri are much less frequent on 2- and 3-year-old specimens of Trachurus and probably occur only very rarely on still older fishes, the limiting factor being not an age-immunity but a post-spawning migration of the host from the concentration of free-living infective stages of the parasites in coastal waters.

The parasites have adapted themselves to a seasonal change in the feeding habits of Trachurus by ceasing to produce larvae in anticipation of the summer disappearance of scad from the sea bottom in pursuit of pelagic food-organisms.

Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 42 , Issue 3 , October 1962 , pp. 587 - 600
Copyright
Copyright © Marine Biological Association of the United Kingdom 1962

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