A study conducted by Istanbul University and the Ministry of Environment, Urbanization and Climate Change reveals that the surge in jellyfish population in the Marmara Sea is adversely impacting the fishing industry. The overpopulation of jellyfish is causing obstructions in fishing nets, preventing fishermen from catching their desired species, and leading to increased time and costs spent at sea. The research also indicates a decline in the diversity of breeding fish and the quantity of fish eggs, as jellyfish feed on them.