Bluefin tuna are among the most expensive fish on the planet. Just one can sell for more than $100,000 in Tokyo, where it is highly prized by top sushi chefs. But the taste for this luxury tuna in Japan has decimated global bluefin populations. In June the European Union ended the Mediterranean fishing season early, and US Atlantic stocks may be close to collapse.
But there is hope. Last week scientists used special spearguns to implant hormones into adult bluefin in sea-cages off Italy. Three days later they spawned, producing 10 million fertilised eggs in four days. “This is…
