The prospect of farming endangered bluefin tuna from eggs to fully mature adults has come a step closer with the first natural mass spawning of the species in captivity.
A stock of bluefin tuna, used in highly-prized sashimi, have produced millions of eggs that have hatched into larvae at a research facility on Croatia's Adriatic coast, operated by a US company.
Umami Sustainable Seafood of San Diego said it was the first time bluefin tuna in captivity had reproduced naturally.
