Ultimate TRUTH behind fish SCENT

We smell fish, but can they smell us?
grouper macro by laszlo-photo is licensed under CC BY 2.0.
"Red Grouper" by NOAA Ocean Exploration & Research is licensed under CC BY-SA 2.0.
Sharon High School, CC BY-SA 3.0, via Wikimedia Commons

[@johnfast5852]

Makes a lot of sense.