Benign effect of the fish parasitic isopod Ceratothoa cf. imbricata on Selenotoca multifasciata (Scatophagidae) from Australia

Carrasson, M. and Cribb, T. H. (2014) Benign effect of the fish parasitic isopod Ceratothoa cf. imbricata on Selenotoca multifasciata (Scatophagidae) from Australia. Diseases of Aquatic Organisms, 110 3: 173-180. doi:10.3354/dao02751

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Author Carrasson, M.
Cribb, T. H.
Title Benign effect of the fish parasitic isopod Ceratothoa cf. imbricata on Selenotoca multifasciata (Scatophagidae) from Australia
Formatted title
Benign effect of the fish parasitic isopod Ceratothoa cf. imbricata on Selenotoca multifasciata (Scatophagidae) from Australia
Journal name Diseases of Aquatic Organisms   Check publisher's open access policy
ISSN 1616-1580
0177-5103
Publication date 2014-08-11
Year available 2014
Sub-type Article (original research)
DOI 10.3354/dao02751
Open Access Status File (Publisher version)
Volume 110
Issue 3
Start page 173
End page 180
Total pages 8
Place of publication Oldendorf, Germany
Publisher Inter-Research
Collection year 2015
Language eng
Formatted abstract
The tongue-biter cymothoid isopod Ceratothoa cf. imbricata is nearly ubiquitous in buccal cavities of the banded scat Selenotoca multifasciata (Scatophagidae) from Waterloo Bay, south-east Queensland. To test whether infestation affects fish growth or condition significantly, we explored parasitism and condition in 122 S. multifasciata specimens. The internal area of the buccal cavity and that occupied by ovigerous female isopods were measured, allowing the relative proportion of free internal area of the buccal cavity (PFIAO) to be calculated. Of 122 fish, 119 (97.5%) were infected; 35.3% had large female isopods, the remaining infections comprised much smaller mancae, juveniles and adult males. Mean intensity of infection was significantly correlated with fish total length (TL). In some fish, the female isopod occupied up to 80% of the buccal cavity area. There was little evidence of attachment damage in the buccal cavity; only 9 of 43 hosts analysed had restricted damage to the tissues at the points of attachment of the female isopod. Condition factor, food intensity index and stomach weight did not differ between fish with and without female C. cf. imbricata. The relative proportion of free internal area of the buccal cavity with respect to the fish total length (PFIAO/TL 2 ratio) of fish infected with females correlated with food intensity and condition factor. Although the correlation was significant, the actual effect was not large because more than 70% of these 2 indices was not explained by the PFIAO/TL2 ratio (r2 < 0.3 in both cases). Despite the dramatic appearance of infestations and the high prevalence of C. cf. imbricata in the population, the near-absence of pathological alterations and the limited effect of the isopod on the condition indices and food intenity suggest that this isopod is relatively benign for S. multifasciata.
Keyword Ceratothoa cf. imbricata
Oral ectoparasite
Selenotoca multifasciata
Asymptomatic infection
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2015 Collection
School of Biological Sciences Publications
 
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