# Set up the population, define functions etc
source("http://tutor-web.net/fish/fish5107stockpred/lecture50/functions.r")
source("http://tutor-web.net/fish/fish5107stockpred/lecture50/initproj.r")
# Typical commands
Fmort<-0.4
tmp<-project(years,Ncurrent,Fmort,sa,M,wa,alpha,K)
Straj<-tmp$S
Ytraj<-tmp$Y
plot(Srange,Yrange,type='l',lwd=2,ylim=c(0,20000))
points(Sinitial,0,col="green")
lines(Shist,Yhist,col="red")
lines(Straj,Ytraj,col="blue",lwd=3)
points(Straj,Ytraj)
Details
The medium-term projection is a natural extension of the short-term projection.\\
The equilibrium yield and biomass computations correspond to an infinite-horizon continuation of the medium-term projection.\\
It is often useful to include the following on a single plot with SSB on the x-axis and yield on the y-axis: \begin{itemize} \item the current level of biomass and yield \item the equilibrium biomass-yield curve \item the projection from the current point through the projections towards the equilibrium \item the historical trend of (S,Y)-pairs \end{itemize}