Patent ID: 8171884

Claim:
A system comprising: an elongated chamber at least partially submerged in a water reservoir; a bladder comprising food for aquatic animals disposed inside the chamber; a piston concentrically arranged inside the chamber, the piston exerting a force on the bladder which causes ejection of the food into the water reservoir through an opening in the chamber; and a control system coupled to the outside of the chamber, the control system configured to periodically initiate movement of the piston to exert the force, and the control system comprising: a pump coupled to the chamber, the pump configured to draw water from the water reservoir and pump water into the chamber which causes movement of the piston; and a bellows arranged inside the chamber, wherein a first end of the bellows fluidly coupled to the pump and a second end of the bellows coupled to the piston; and a watertight case; a battery within the case; and a timer circuit within the case coupled to the battery, the timer circuit configured to control the movement of the piston.