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Expanding ocean dead zones are shrinking marlin habitat
Scientists sound an alarm that expanding ocean dead zones are shrinking the habitat for high value fish such as marlins in the tropical northeast Atlantic Ocean
Credit: Citron / CC-BY-SA-3.0
Blue marlins and many other billfish are high energy fish that need large amounts of dissolved oxygen.
Nature | Expansion of oxygen minimum zones may reduce available habitat for tropical pelagic fishes | 12-21-2011
As dead zones expand, marlins, other billfish and tunas move into surface waters where they are more vulnerable to fishing.
“
The shrinking of habitat due to expanding dead zones needs to be taken into account in scientific stock assessments and management decisions for tropical pelagic billfish and tuna
”—Eric Prince, Ph.D., NOAA Fisheries biologist.
Dead zones are areas in the ocean where oxygen levels are so low that most fish cannot survive over the long term.
Blue marlins and many other billfish are high energy fish that need large amounts of dissolved oxygen. By comparing the movement of the blue marlins and the location of low-oxygen areas, scientists have show that blue marlins venture deeper when dissolved oxygen levels are higher and remain in shallower surface waters when low dissolved oxygen areas encroach on their habitat from below.
Primary source â–º Expansion of oxygen minimum zones may reduce available habitat for tropical pelagic fishes
Further reading â–º http://x-ray-mag.com/
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