The trophic-level based model is a new way to study how fishing affects marine ecosystems. It looks at how different levels of animals in the ocean interact with each other. The model shows that high fishing and catching lower-level animals can reduce the total amount of animals in the ecosystem. It also shows that how fast animals grow and move energy through the ecosystem is important in how fishing impacts the ecosystem. The model suggests that fishing can have effects on all levels of animals in the ocean, not just the ones being caught. Overall, the model helps us understand how fishing affects marine ecosystems and can be used to make better decisions about managing fisheries.