The major consequence of overfishing on marine biodiversity is the depletion of fish populations, which disrupts marine ecosystems and affects the balance between species. As key predators and prey are removed, it can lead to shifts in the entire food web, resulting in the decline of certain species and an increase in others. This imbalance can cause further environmental changes, impacting habitat quality and ecosystem services such as nutrient cycling and coastal protection. Sustainable fishing practices are essential for preserving marine biodiversity.