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NOAA seeks comment on regulations to protect marine mammals

Connie  Barclay
(301) 427-8003
(202) 441-2398 (Cell)
March 18, 2014

NOAA Fisheries is seeking comments for a proposed rule requiring the United States Navy to implement protective measures during training and testing activities around the Mariana Islands and on the high seas of the Pacific Ocean to reduce the chances of harming marine mammals.

The Navy has requested an authorization under the Marine Mammal Protection Act, because the mid-frequency sound generated by active sonar and the sound and pressure generated by detonating explosives may affect the behavior of some marine mammals, cause a temporary loss of their hearing sensitivity or other injury.

NOAA Fisheries recently made a preliminary determination that these effects would have a negligible effect on the species or stocks involved.  Based on that preliminary determination, it does not necessarily expect the exercises to result in serious injury or death to marine mammals, and proposes that the Navy use mitigation measures to avoid injury or death.

However, exposure to sonar in certain circumstances has been associated with the stranding of some marine mammals, and some injury or death may occur despite the best efforts of the Navy. Therefore, the proposed authorization allows for a small number of incidental mortalities to marine mammals from sonar, as well as vessel strikes and explosions.

Under the authorization, the Navy would have to follow mitigation measures to minimize effects on marine mammals, including:

  1. establishing marine mammal mitigation zones around each vessel using sonar;
  2. using Navy observers to shut down sonar operations if marine mammals are seen within designated mitigation zones;
  3. using mitigation zones to ensure that explosives are not detonated when animals are detected within a certain distance; and
  4. implementing a stranding response plan that includes a training shutdown provision in certain circumstances, and allows for the Navy to contribute in-kind services to NOAA Fisheries if the agency has to conduct a stranding response and investigation.

These measures should minimize the potential for injury or death and significantly reduce the number of marine mammals exposed to levels of sound likely to cause temporary loss of hearing. Additionally, the proposed rule includes an adaptive management component that requires that the Navy and NOAA Fisheries meet yearly to discuss new science, Navy research and development, and Navy monitoring results to determine if modifications to mitigation or monitoring measures are appropriate.  

NOAA Fisheries and the Navy have worked to develop a robust monitoring plan to use independent, experienced vessel-based marine mammal observers (as well as Navy observers), and passive acoustic monitoring to help better understand how marine mammals respond to various levels of sound and to assess the effectiveness of mitigation  measures. Additionally, an Integrated Comprehensive Monitoring Plan developed by the Navy (with input from NOAA Fisheries) will better prioritize monitoring goals and standardize data collection methods across all U.S. range complexes.  

The proposed rulemaking and the Navy’s application are available at the following website:

NOAA Fisheries will accept comments for 45 days following publication of the notice. Comments should be addressed to:

Jolie Harrison, Permits and Conservation Division

Office of Protected Resources

National Marine Fisheries Service

1315 East-West Highway

Silver Spring MD 20910-3225

Electronic comments can be sent via the Federal eRulemaking Portal:, using the identifier 0648-BD69.

NOAA’s mission is to understand and predict changes in the Earth's environment, from the depths of the ocean to the surface of the sun, and to conserve and manage our coastal and marine resources. Join us on Facebook, Twitter and our other social media channels at


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