According to IFLScience, it’s manta rays that have the largest brain of any ocean fish. These fish are cartilaginous fish ...

The largest ray in the world (up to 8m wide!), the giant manta is a graceful and gentle ... extremely intelligent and possess the largest brain of any fish. Glial cells are thought to be a sign ...

The giant fish faces threats from poachers, boat strikes and climate change Photographs by Alex Mustard Text by Terence Monmaney After the manta ray filters out the tiny plankton from the water it ...