Nov 12, 2018 · In 1979, those juveniles matured and spawned, marking the world’s first spawning of large tuna species under captive conditions. But then, our artificially hatched fish died in 1979, 1980 and 1982. From 1983 to 1993, no spawning occurred at all.” A site in Kumano, Mie Prefecture – one of 10 bluefin tuna farming sites belonging to Maruha
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