Figure 4
From: Dynamical analysis of a stochastic toxin-producing phytoplankton–fish system with harvesting
The existence of stationary distribution for system (2). (a) Bifurcation diagram with respect to \(\delta_{1}\) and \(\delta_{2}\), where I indicates that there is no stationary distribution for system (2) and II denotes that there is a stationary distribution for system (2). (b) The histogram of probability density function of phytoplankton and fish for system (2), where the gray smoothed curve signifies the probability density function of phytoplankton or fish