Weird things

Weird things

Observation - Weird things. Description: Found a plastic plant tray floating in a lake. These jelly like transparent things were attached to it. They Were stuck fast to the plastic and when I washed them off they left stuff that was glued to the plastic. Are they used up egg sacs? Bacterial grow

Found a plastic plant tray floating in a lake. These jelly like transparent things were attached to it. They Were stuck fast to the plastic and when I washed them off they left stuff that was glued to the plastic. Are they used up egg sacs? Bacterial growths? I have no idea.