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Full bluefin tuna farm shares rise as fish stocks dwindle

Tight restrictions and big appetites promise tidy profits if farms can iron out kinks

Feed One and Kyokuyo plan to ship their first fully farmed bluefin tuna in November, grown in Japanese tuna farms like this one in Ehime Prefecture.

TOKYO -- Full farming of bluefin tuna, which starts with getting the fish to spawn in a completely artificial environment, is finally showing signs of becoming profitable.

Investors are responding accordingly, pushing up the stocks of companies that develop technologies for artificially hatching eggs and fattening fingerlings to maturity. These companies include Feed One, a major feed supplier, and seafood companies Kyokuyo and Nippon Suisan Kaisha, or Nissui.

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