How to control the number of parcels/particles injected

I'm completely new to ANSYS Fluent so I'm very unfamiliar with the software.  I am using version 19.0.  I want to model the movement of a finite number of particles in a tank filled with water.  The water is entering and exiting the tank.  I am able to build a rough model and incorporate the particle tracker with it, but it looks like the particle tracker constantly releases particles from what I assume are parcels.  Is this correct?  How could I limit the number of particles injected from these parcels to a finite number?

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