Blue Ocean Institute

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Species is relatively abundant, and fishing methods cause little damage to habitat and other wildlife.
Marlin, Blue – Hawaii These fish contain levels of mercury or PCBs that may pose a health risk to adults and children.

Blue Marlin is a large pelagic species, found in tropical and temperate waters worldwide. This assessment is for Blue Marlin caught in the U.S. Hawaii fishery only. Blue Marlin mature early, produce many eggs, and grow fast, reaching sizes up to 450 cm and 900 kg.  The last population assessment for Blue Marlin in the Pacific indicated that abundance levels were moderate, but the assessment has not been updated for over a decade. There is some indication that Blue Marlin abundance around Hawaii may be declining.

This species is primarily captured with pelagic longlines, which result in minimal habitat damage and moderate bycatch rates. Around Hawaii, trolling is another common method used to catch Blue Marlin. Regulations for pelagic fisheries that capture Blue Marlin are set at both the international and national level, and include measures to effectively reduce fishery interactions with protected seabirds and sea turtles.

Consumers should note that illegally-sold Atlantic Blue Marlin reaches the U.S. Market. Be wary unless you are certain that the Blue Marlin you are considering was caught in the U.S. Hawaiian fishery. Our partner the Monterey Bay Aquarium’s Seafood Watch lists Blue Marlin as yellow. We plan to jointly reevaluate Blue Marlin sometime in 2014.

Full species report here.

This fish may have high levels of mercury that could pose a health risk to adults and children. More info here about mercury in marlin. Check out our mercury in seafood section.