Spot-fin Porcupinefish and Sharksucker 

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At dusk on the third dive of the day I found this lone sharksucker (Echeneis naucrates) which had attached itself to this spot-fin porcupinefish (Diodon hystrix) for want of anything larger. The sharksucker eats any parasites off the host fish, so both parties are happy, although I'm sure a whale shark would provide the sharksucker with a bigger meal!

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Nick Hope