Journal
ENVIRONMENTAL BIOLOGY OF FISHES
Volume 104, Issue 7, Pages 881-886Publisher
SPRINGER
DOI: 10.1007/s10641-021-01121-8
Keywords
Cleaner fish; Cleaning symbiosis; Commensalism; Fish spa; Ichthyotherapy; Mutualism
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An unexpected interaction between the introduced fish species Poecilia latipinna and humans was observed in Lake Vouliagmeni, Greece, where the fish approached and grazed on the skin of bathing humans. This phenomenon is likely a product of multiple contingencies and unique ecological circumstances.
Here, I report an unexpected interaction between the introduced fish species, Poecilia (Mollienesia) latipinna and humans in Lake Vouliagmeni, Greece. In this lake, I observed the normally skittish P. latipinna approach and graze on the exposed skin of bathing humans, presumably removing dead skin cells in what amounts to an exfoliating process. The natural occurrence of this phenomenon in Lake Vouliagmeni is likely a product of multiple contingencies, including the introduction of P. latipinna sometime around the mid-twentieth century, and the fairly unique ecological circumstances. I suggest and discuss several conditions that must be met for such a cleaning interaction to develop, including an appropriate fish species being present, an environment in which fish are able to safely approach humans without being captured or otherwise harmed, and human tolerance-even enjoyment-of the behavior. Finally, I point out a number of remaining questions including whether both species receive a net benefit, if there has been any behavioral or physiological feeding specialization, and whether similar phenomena occur elsewhere in the world.
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