Once again, the mullet are running. Every year at this time, these little fish migrate by the millions down the Indian River Lagoon, grazing on all sorts if vegetation including algae, which choke up our sea grass. The mullet, in turn, are food for a wide variety of birds and fish, including sea trout, jack, red drum, flounder and tarpon. And these fish, in turn, are food for us. Where mullet are jumping you often see humans fishing. Which brings up a question asked on the Treasure Coast. Why do mullet jump? When I go out in a kayak in September or October, they jump all around me.