2009: Source of tuna may decrease by 37% due to warming of the Earth

Japanese researchers warn that if the global climate continues to warm up at the current rate, by the end of the century, tuna resources in the Pacific will be seriously affected by their reproductive environment. be narrowed.

(Photo: Laodong) According to the researchers, the source of tuna - now sharply reduced due to indiscriminate fishing - will continue to decrease if the sea temperature is higher than the favorable temperature for reproduction.

Researchers experimented with raising tuna at different temperatures and found that most tuna species could die when the sea temperature reached nearly 30 degrees Celsius. Meanwhile, heat The most ideal for tuna reproduction is 26 degrees Celsius. Even with a temperature of about 20 degrees Celsius, tuna species are still able to survive.

Based on the analysis of the effects of global warming on seawater temperature in the tuna breeding environment, the researchers said that by 2099, the tuna's reproductive environment will decrease sharply and The number of surviving tuna will decrease by 37% compared to the current level. However, researchers predict that a new spawning environment of tuna species will appear in the Sea of ​​Japan.

During reproduction, tuna species in the Pacific often migrate in a wide range from East to West. However, their future breeding environment will be limited to areas from Taiwan to the seas around Amami Oshima island of Kagoshima Prefecture in Japan.