Pictures often tell the story, but I can't tell from photo. Has anyone else observed this activity along C100?

This photo was sent to me by a friend who resides along the C100 canal - the photo was received mid morning on Tuesday, January 14, 2020.

I have posted prior photos of happenings in this canal, from invasive fish and iguanas, hunting iguanas and canal repair/restoration.

The observation is of spraying taking place from those on this boat.

Has anyone else observe this and, if so, can someone provide additional insight as to what is happening in the C100 canal.