Tuna use sharks as scratching posts

[Reef Builders]

If you’re a pelagic fish swimming the open oceans your options are limited when it comes to something to rub up against. Offshore fish suffer parasite infestations just like any other fish, only for reef-associated fish, they have various surfaces to flash and scratch against to try to remove them. A University of Western Australia…
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[G Santana]

Very cool article