Define "flow rate" in the context of an advanced raceway.

Flow rate refers to the volume of water that moves through the raceway system over a specified period. It is a critical parameter in aquaculture as it influences various factors such as oxygen levels, waste removal, and the overall health of the aquatic ecosystem. Adequate flow rates ensure that fish maintain optimal living conditions, as they are reliant on a consistent supply of clean, aerated water to thrive. Understanding and managing the flow rate allows operators to optimize their raceway systems for efficiency and the well-being of the fish.