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Measuring fish body condition with or without parasites: does it matter?

C Lagrue1, R Poulin1

  • 1University of Otago, Department of Zoology, Dunedin, 340 Great King Street, P.O. Box 56, Dunedin 9054, New Zealand.

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|August 19, 2015
PubMed
Summary

Excluding parasite mass from fish body mass calculations can overestimate fish condition. Accurate body condition indices require accounting for parasite mass to avoid misinterpreting host-parasite interactions.

Keywords:
Gobiomorphus cotidianusbody condition indexhelminth parasitesparasite load indexresidual index

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Area of Science:

  • Ecology
  • Parasitology
  • Ichthyology

Background:

  • Body condition indices are crucial for assessing fish health.
  • Parasites can significantly impact host physiology and biomass.
  • Accurate assessment of fish health requires accounting for all biomass components.

Purpose of the Study:

  • To determine the effect of parasite mass on fish body condition indices.
  • To assess how parasite load influences the perceived impact of parasitism on fish health.
  • To evaluate the accuracy of body condition indices when parasite biomass is included or excluded.

Main Methods:

  • Calculated fish body condition indices twice: once including parasite mass, once excluding it.
  • Estimated helminth parasite mass in common bully (Gobiomorphus cotidianus).
  • Correlated parasite load with both alternative body condition index values.

Main Results:

  • Inclusion of parasite mass significantly altered the correlation between parasite load and fish body condition.
  • Excluding parasite mass resulted in a positive correlation, suggesting better-conditioned fish host more parasites.
  • Excluding parasite mass led to overestimation of fish body condition, particularly with higher relative parasite mass.

Conclusions:

  • Parasite mass must be accounted for in fish body condition calculations.
  • Excluding parasite mass can lead to inaccurate interpretations of host-parasite dynamics.
  • Accurate fish condition assessment requires differentiating host and parasite tissues.