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They specifically looked at tropical tuna -- skipjack, bigeye and yellowfin.

The researchers found yellowfin and bigeye tuna have increased around the reserve.

Unlike some types of fish, such as swordfish and bigeye tuna, shrimp are low in mercury, which makes them safe for pregnant women, according to the Food and Drug Administration.

The likes of skipjack, yellowfin, bigeye and albacore tuna are consumed by millions of people across the world and one of the most commercially valuable fish.

A longtime Corduroy signature — rare bigeye tuna crusted in black pepper and coriander — perches on seaweed-strewn sushi rice imbued with the flavors of coconut, ginger and lemongrass.