This book gives an advancement of the theory of games by linking individual variation to fecundity of a given individual. Methods are given for combining a Game Theory Matrix and a Leslie Matrix, to come up with a mixed, Aggregated Model. Applications have been done to Marine fishes, and equilibrium structures for Optimal harvesting are also determined. The book is well suited for graduate and undergraduate students who would like to improve their knowledge of Ecology, as well as Population dynamics.