Apparently they are filter feeders of zooplankton, which they eat through their open mouths while swimming.
I heard that they are filter feeders. So they eat tons of zooplankton when they swim around with their mouths open.
I once swam with a Manta Ray when I was on vacation in Florida. No way? That's the rays in the genus ''manta'' right? What was it like? Well I didn't realize it was there until I looked down.  It didn't seem to acknowledge my presenad and kept looking for more fish to eat. Oh, wow! There are two species of manta, a larger and a smaller one. Do you know which yours was? A Smaller one.  I think I would have noticed a bigger one earlier. That's pretty cool. They are generally found in subtropical and tropical waters. Yeah a lot of people at the beach where I was had seen them a lot more in the summer than winter.
They are filter feeders and eat large quantities of zooplankton, which they swallow with their open mouths as they swim.