I thought this was very interesting also:
Quote:
A recent study which analysed the causal link between cleaner fish presence/absence and reef fish diversity at Ras Mohammed, Egypt, demonstrated that Labroides dimidiatus have a significant effect on local reef fish diversity with a more rapid increase in diversity being recorded when cleaner fish are added to individual reef patches [46]. Indeed, the removal of Labroides dimidiatus had no effects on fish abundance within the first few weeks, but a significant decline in fish diversity was recorded after a 4-20 month time period. On the other hand, the immigration or addition of Labroides dimidiatus individuals to reef patches led to an immediate, i.e. within 2-4 weeks, significant increase in fish diversity. In addition to playing a key role in reef health - and thus the removal of Labroides dimidiatus in large quantities for the aquarium trade potentially having negative impacts on reef diversity - aquarists are advised to avoid this species as it tends to fare poorly in aquarium conditions unless kept with a large community of fishes, and is not likely to accept substitute foods [47].
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I don't know if you guys have seen the DVD " The Blue Planet " but there it mentions that at certain times there are mass migrations of fish to the reefs with the main purpose of being rid of parasitic infections it even shows Passer Angels on a feeding frenzy of parasites on Sharks.