Assessing global status of tuna and billfish stocks

A global study quantifies the threat to tuna and billfish populations around the world. The seven threatened species are southern bluefin tuna, Atlantic bluefin tuna, bigeye tuna, blue marlin, white marlin, and two species of Spanish mackerels. Researchers says two main factors contribute to these fishes' troubled status: the tunas' high dollar value leads to heavy fishing pressure, and all the species are slow to reach sexual maturity, prolonging any recovery from over-fishing.

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