From Deena - very interesting!
Check out this article on the Mola mola. The sunfish is commonly found in temperate and tropical waters basking at the surface and although the sunfish is the world's heaviest bony fish, it feeds at the base of the food web.
These fish were once considered to be large plankton that drift with the currents but this article provides evidence that the sunfish are capable of tracking prey and swimming against the current.
See this article at:
http://oceansunfish.org/DewarEtAlJEMBE.pdf
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