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Edges of Gulf Dead Zone Increase Shrimp Harvest (and Bycatch)

Researchers studying the Gulf of Mexico “dead zone” have confirmed what fishermen have probably known for a long time—that trawling for shrimp around its edges yield larger catches. Shrimp and fish move to a narrow band surrounding the edges of the dead zone, where the low oxygen levels aren’t lethal, making them more vulnerable to getting caught in shrimp trawls.

The problem is that these fish are then thrown back over the side. Discarded fish, known as bycatch, usually die. A Gulf without a dead zone means fewer fish wind up in shrimpers’ nets. Less bycatch means more fish available for commercial or recreational harvesting.

This study demonstrates yet another unintended consequence the dead zone is causing to both commercial fisheries and the environment. This project led by NOAA Fisheries is funded by the National Centers for Coastal Ocean Science.

Last summer a researcher we fund discovered that chronic low oxygen levels cause female croaker to become male, increasing the possibility that they could face a population crash.

Read the research paper abstract “Aggregation on the Edge: Effects of Hypoxia Avoidance on the Spatial Distribution of Brown Shrimp and Demersal Fishes in the Northern Gulf of Mexico.”

Learn more about the project “Effects of Hypoxia on Harvest Dynamics and Economics of the Shrimp Fishery in the Northwestern Gulf of Mexico.”

Learn more about NCCOS Gulf of Mexico dead zone research.

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Shorter web link for sharing: http://coastalscience.noaa.gov/news/?p=4151

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