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Convex Seascape SurveyOverfishing happens when people catch too many fish from the ocean, not leaving enough behind for the population to recover. It occurs when fish are caught faster than they can reproduce and replace themselves. Overfishing can happen with any type of fish, from small fish like sardines to large fish like tuna.
Overfishing is a global problem, affecting oceans all over the world. Some of the most heavily overfished areas include the Mediterranean Sea, the North Atlantic Ocean, and the coastal waters of Southeast Asia. Many fish species that are popular for food, like cod, salmon, and tuna, are overfished in multiple regions.
Overfishing can lead to the collapse of fish populations, meaning there are so few fish left that the population can’t recover. When fish populations collapse, it can disrupt entire marine ecosystems. Overfishing can also affect the livelihoods of people.
As human populations have grown and fishing technology has advanced, the demand for fish has increased dramatically. Some fishing practices, like bottom trawling and the use of huge nets, can catch large numbers of fish indiscriminately, including young fish and non-target species. Illegal, unreported, and unregulated (IUU) fishing also contributes to overfishing, as it’s difficult to monitor and control.
The United Nations Food and Agriculture Organization (FAO) estimates that about one-third of the world’s fish stocks are overfished. Some fish populations, like Atlantic cod and bluefin tuna, have declined by over 90% due to overfishing. If overfishing continues at the current rate, it’s estimated that many fish populations could collapse by the middle of this century.
Some solutions include setting catch limits, establishing marine protected areas, and promoting sustainable fishing practices. Consumers can also help by choosing to buy sustainably caught fish and supporting businesses that prioritize sustainable seafood. While overfishing is a serious problem, there is hope for the future. In some areas where strict fishing regulations have been implemented, fish populations have started to recover.
Science / Geography | Ages 7-11
The Ocean Heroes unit for KS2 takes classes on a journey across different ocean habitats exploring the themes of climate change, nature, conservation, and what it takes to become an ocean hero. This unit is inspired by the work of the Convex Seascape Survey which is an international science project exploring how the ocean can be an ally in tackling climate change.