A Stage-Structured Fishery Model for African Catfish and Nile Tilapia Feeding on Two Food Resources with Harvesting

Figure 1

Schematic diagram of the dynamics of African catfish, , Nile tilapia, , and two food resources, and ; solid arrows indicate growth, reproduction, mortality, and maturation from one stage to another whereas dashed connections show the flow of energy in the food-web. The remaining parameters in the graph are defined through Equations (4)–(13) (Tables 1 and 3–5).