  Lampreys are one of the oldest species in the world, living longer than
dinosaurs, which is related to the ability to change the sex ratio during their
lifespan. In this paper, to understand how sex ratio and food quantity affect
the population growth rate of lampreys, the researchers draw inspiration from
the logistics model and established a model called EcoSexChange(ESC), which
results in a population initially increasing and then stabilizing, a reasonable
outcome that may apply to other organisms with significant differences in
consumption between sexes. Subsequently, this paper develops the Sex Ratio
Adaptation Eco Impact (SRAEI) model based on the ESC model using the ABM
algorithm to simulate how the population of lampreys, whose lives are divided
into seven stages, grows and stabilizes. Then introduces a sudden disaster
factor in the middle of the simulation, while also comparing lampreys that
cannot adjust their sex ratio. The results of this paper are of great reference
significance for people to analyze the population changes of lampreys in
different living environments, and they are also easy to apply to other species
with large differences between males and females.
