A model that describes the population of a fishery in which harvesting takes place at a constant rate is given by (dP/dt) = kP-h . In this k and h is positive constants.
The population growth model is based on the assumption that grows at rate of proportional to size of population . p is the population and k is relative growth rate. dp/dt is signal derived from pressure , typically ventricular blood pressure, indicated the change in pressure over time.
This model for population growth known as the logistic differential equation is dp/dt=kp. According to the population growth model that once population size exceeds available resources and population growth decrease dramatically.
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