The impact of overfishing on marine ecosystems is profound. It leads to *depleted fish populations*, disrupting the food chain and habitats. When key species are removed, such as top predators, it can cause trophic cascading, resulting in an overabundance of some species and the decline of others. This imbalance can decrease biodiversity and affect ecosystem health. Less diverse ecosystems are often less resilient to changes, making them more vulnerable to pollution and climate change.