Cleaner Wrasse Interactions with Pelagic Thresher Sharks
Author Information
Author(s): Oliver Simon P., Hussey Nigel E., Turner John R., Beckett Alison J.
Primary Institution: School of Ocean Sciences, University of Wales, Bangor
Hypothesis
Do cleaner wrasse selectively forage on specific areas of thresher shark clients and do thresher sharks modify their behavior to facilitate inspections?
Conclusion
Cleaner wrasse play an important ecological role in structuring visiting elasmobranch communities at tropical seamounts.
Supporting Evidence
- Cleaner wrasse were observed to conduct 2,757 inspections on thresher sharks.
- Thresher sharks modified their behavior by swimming in a circular stance to facilitate cleaner inspections.
- Cleaner inspections were unevenly distributed, with most occurring on the pelvis and pectoral fins.
Takeaway
Thresher sharks visit cleaning stations where small fish help them get rid of parasites, and they change how they swim to make it easier for the fish to clean them.
Methodology
Remote video observations were conducted over 1,230 hours to analyze interactions between thresher sharks and cleaner wrasse.
Potential Biases
It was not possible to identify individual animals, which may lead to underestimating the number of cleaning inspections.
Limitations
The true number of independent observations of sharks may be less than the total recorded due to potential repeated sightings of the same individuals.
Participant Demographics
The study focused on pelagic thresher sharks and cleaner wrasse at Monad Shoal in the Philippines.
Statistical Information
P-Value
p<0.0001
Confidence Interval
95% CI: 5.22–7.32 minutes
Statistical Significance
p<0.05
Digital Object Identifier (DOI)
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