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Using length-frequency data to elucidate the population dynamics of Argulus foliaceus (Crustacea: Branchiura)

Published online by Cambridge University Press:  24 June 2009

N. G. H. TAYLOR ,
R. WOOTTEN  and
C. SOMMERVILLE
N. G. H. TAYLOR*
Affiliation:
Institute of Aquaculture, University of Stirling, FK9 4LA, UK Centre for Environment Fisheries and Aquaculture Science (Cefas), Weymouth, Barrack Road, Dorset, DT4 8UB, UK
R. WOOTTEN
Affiliation:
Institute of Aquaculture, University of Stirling, FK9 4LA, UK
C. SOMMERVILLE
Affiliation:
Institute of Aquaculture, University of Stirling, FK9 4LA, UK
*
*Corresponding author: CEFAS, Weymouth, Barrack Road, Dorset, DT4 8UB, UK. Tel: +44 (0) 1305 206719. Fax: +44 (0) 1305 206601. E-mail: nick.taylor@cefas.co.uk
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Summary

This study uses a novel method for discriminating cohorts and investigating the population dynamics of the parasitic crustacean, Argulus foliaceus. Analysis of parasite length-frequency data was carried out in order to elucidate the timings and drivers behind the parasite's life cycle. Up to 6 cohorts of the parasite emerge through the course of 1 year in still-water trout fisheries in England. Recruitment ceases over the winter months; however, 3 cohorts of the parasite over-winter, 2 as eggs and 1 as a hatched stage. The technique, when used in conjunction with temperature data, also allowed for the reliable prediction of growth rates and provided estimates of egg incubation times and the length of hatching periods. These data showed that growth rates increased exponentially between the observed temperatures of 4 to 22°C. The method allowed for the time taken from hatching to egg laying under field conditions to be predicted and produced estimates that were validated against independent laboratory studies on the growth of the parasite.

Keywords

fish licecohort analysisfisheryOncorhynchus mykisstrout
Type
Research Article
Information
Parasitology , Volume 136 , Issue 9 , August 2009 , pp. 1023 - 1032
Copyright
Copyright © Cambridge University Press 2009

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