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Life cycle of the temporary fish parasite, Gnathia pilosus (Crustacea: Isopoda: Gnathiidae) from the east coast of South Africa

Published online by Cambridge University Press:  22 May 2009

Kerry A. Hadfield ,
Nico J. Smit  and
Annemarié Avenant-Oldewage
Kerry A. Hadfield
Affiliation:
Department of Zoology, University of Johannesburg, PO Box 524, Auckland Park 2006, South Africa
Nico J. Smit*
Affiliation:
Department of Zoology, University of Johannesburg, PO Box 524, Auckland Park 2006, South Africa
Annemarié Avenant-Oldewage
Affiliation:
Department of Zoology, University of Johannesburg, PO Box 524, Auckland Park 2006, South Africa
*
Correspondence should be addressed to: N.J. Smit, Department of Zoology, University of Johannesburg, PO Box 524, Auckland Park 2006, South Africa email: [email protected]
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Abstract

The life cycle of the South African gnathiid isopod, Gnathia pilosus, was studied using the common east coast tidal pool fish, Scartella emarginata and Antennablennius bifilum as hosts. Laboratory studies observing the feeding ecology of these temporary ectoparasites determined that the second and third unfed larval stages (zuphea larvae 2 and 3) took an average of 3 hours 52 minutes and 4 hours 19 minutes to feed respectively. After feeding, the second stage fed larvae (praniza 2) took 35 days to moult into the third zuphea form. Male and female praniza 3 larvae could be discerned before their final moults into adults which took place approximately 42 and 48 days respectively after their blood meals. Fertilization occurred within 24 hours after the female had completed her moult. It was thus estimated that the complete life cycle from the first larval stage to adult took between 134 to 140 days in water temperatures ranging between 20°C and 25°C. The length for this life cycle is unexpectedly long for gnathiids living in subtropical waters and may indicate that water temperature is not always the main factor in determining the duration of gnathiid life cycles.

Keywords

isopodgnathiidlife cyclelife stageectoparasiteGnathia pilosus
Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 89 , Issue 7 , November 2009 , pp. 1331 - 1339
Copyright
Copyright © Marine Biological Association of the United Kingdom 2009

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