Spotting

Thanks Daniel,
I was really curious, you helped me!!

Hi Camila and welcome to Project Noah! This looks like an isopod, some of which are parasites of fish. According to Wikipedia (http://en.wikipedia.org/wiki/Isopoda), the Flabellifera and Cymothoida suborders of isopoda contain parasitic species. Although this is not the species you have spotted, Cymothoa exigua is worth checking out - it eats fishes tongues and then sits in their place! Fascinating stuff: http://en.wikipedia.org/wiki/Cymothoa_ex.... Happy spotting :)