Culture system

A culture system that forms a cell aggregate by liquid culture, the culture system comprising:

• a culture portion that contains a liquid and has an outlet through which the liquid is led out and an inlet through which the liquid is introduced;
• a path portion that allows the liquid to flow between the outlet and the inlet;
• a monitoring portion capable of monitoring a component in the liquid and/or properties of the liquid in at least one of the culture portion and the path portion;
• an adjustment portion capable of adjusting the component in the liquid and/or the properties of the liquid in at least one of the culture portion and the path portion;
• and
• a control portion capable of controlling the adjustment portion on a basis of a monitoring result of the monitoring portion, wherein
• the control portion
• performs a liquid adjustment amount treatment that causes the adjustment portion to stepwise adjust an amount of the liquid in the culture portion.