Overfishing: A Threat to Ecosystems

In 2013, 489 pound bluefin tuna was sold at Tsukiji fish market in Japan for 1.76 million dollars. Bluefin tuna is the first bluefin tuna sold this year, breaking the record up to about 1 million dollars, making it the most expensive fish ever (WWF). This special fish can make delicious sushi and sashimi, and the average cost per fish is as high as $ 100,000 (planet of the animal). Fishermen are driven by such high prices and use all the means to capture bluefin tuna and other high margin fish.

The extent and degree of human threats to marine ecosystems can easily be overwhelming. Currently the threat list is general: climate change, overfishing, zones of eutrophication and death, ocean acidification, invasive species, coastal development, habitat destruction. The list continues to increase, including marine garbage, microplastic, light and noise, deep sea mining. As a scientist, how do you understand all these when trying to understand and predict how species and ecosystems respond to human stress? As a resource manager or philanthropist, how do you prioritize resource and action assignments?

The threat to the world oceans is still present; or more accurately when these threats have increased, as we began to understand the effects of overfishing, greenhouse gas pollution, and mercury poisoning on the health of marine ecosystems . Unfortunately, however, we seem to be involved in the same misleading idea about the huge productivity of the ocean, the ocean will be able to tolerate and accept unlimited exploitation and abuse It plummeted to the illusion of. In this case, the ecological aesthetics that emphasize the creation of personal miracles is far more powerful than confronting everything that should be abandoned or abandoned, as we are going to live in the sea and inland. It seems not to be. Rachael Carson's vision to the ecology center is more important than ever for us survival, but it also has a clear understanding of the technical and political context that includes our wonderful vision.

The impact of climate change on the ocean worsens the reality of overfishing. Rising sea surface temperature and water level pose a threat to the survival of fish. These changes changed the structure and distribution of the marine ecosystem. Several fishery resources, including sardines, can not adapt to warm water areas, so we move to various areas to accommodate the rise in temperature. Move left an empty fishing ground. The result goes beyond the waters of Portugal. Many fishing resources are currently faced with the same threats and provide billions of people with important livelihoods. There will be no effective management system to increase fishing effort, so that when an endangered population develops, it will have catastrophic global impact.