population does not matter, because reproduction of gizzard shad is so great that a
few adults could fill the system. Thus the peak numbers of larval gizzard shad are
slightly reduced, but the overall population patterns remained unchanged. Egg
survival also does not greatly effect the population or algal biomass.
From the results of sensitivity testing, it appears that manipulations of predator
populations may still have success in controlling gizzard shad populations despite
the fact of rapid gizzard shad growth and high fecundity. Lake managers should
take care to conserve and possibly enhance predator stocks (taking care not to
impact local stocks or environments) in lakes where water quality is important.
Fig. 37.10
37.1 Gizzard Shad Model
335