Scientists in the Midwater Assessment and Conservation Engineering (MACE) Program have historically assessed
the status of walleye pollock and Pacific hake stocks from the coasts of California to the Bering Sea since 1977.
The MACE Program continues to assess walleye pollock in the north Pacific and Bering Sea,
while the Northwest Fisheries Science Center has continued Pacific hake assessments
biennially since 2003. Pollock assessment is conducted with midwater trawl surveys combined with acoustic
(echo integration) technology to develop distribution and abundance time series. Research is also conducted on fishing
gear performance and on fish behavior during the capture process in order to develop methods that reduce bycatch in commercial
Walleye pollock resources in the north Pacific and Bering Sea support the largest single commercial fishery in the
United States and one of the largest commercial fisheries in the world. Surveys to determine the pollock abundance
and distribution are conducted to support NMFS fishery management responsibilities for the territorial sea and to meet
U.S. international fishery management commitments for the Convention on the Conservation and Management of Pollock
in the Central Bering Sea.
Winter surveys of spawning pollock abundance have been conducted annually in the Bogoslof Island area of the Bering
Sea since 1988 and in the Shelikof Strait area of the Gulf of Alaska since 1981. Assessment of summer pollock
abundance in the Bering Sea has occurred routinely since 1979, while Pacific hake abundance off the West
Coast was surveyed from 1977 to 2001. Pollock surveys continue to be conducted in conjunction with bottom trawl
surveys for other groundfish species, and often carried out in cooperation with foreign scientists and foreign research
vessels. The acoustic/midwater trawl survey estimates of distribution and abundance are documented
in various scientific reports and are incorporated into stock assessment advice to fishery management councils,
international fishery management organizations, and industry.
NEW! (Updated 31 January 2013) NOAA Protocols for Fisheries Acoustics Surveys and Related Sampling
Note! Trawl Gear Modification—Preserving Fish Habitat in the Bering Sea
Seafloor Videos from Bering Sea Research Project
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Recent Publications, Poster Presentations, Reports & Activities
- Results of the acoustic-trawl surveys of walleye pollock (Gadus chalcogrammus) in the Gulf of Alaska, February-March 2015 (DY2015-02 and DY2015-03).
McCARTHY, A. L., S. C. STIENESSEN, and D. JONES.
2016. Results of the acoustic-trawl surveys of walleye pollock (Gadus chalcogrammus) in the Gulf of Alaska, February-March 2015 (DY2015-02 and DY2015-03). AFSC Processed Rep. 2016-01, 94 p. Alaska Fish. Sci. Cent., NOAA, Natl. Mar. Fish. Serv., 7600 Sand Point Way NE, Seattle WA 98115. (.pdf, 7.5 MB). Online.
- Investigating the effect of tones and frequency sweeps on the collective behavior of penned herring (Clupea harengus)
HANDEGARD, N., K. BOSWELL, A. De ROBERTIS, G. MACAULAY, G. RIEUCAU, and L. SIVLE.
2016. Investigating the effect of tones and frequency sweeps on the collective behavior of penned herring (Clupea harengus), p. 391-398. In A. N. Popper and A. Hawkins (editors), The Effects of Noise on Aquatic Life II. Springer, New York.
- Advances in methods for marine mammal and fish stock assessments: Thermal imagery and CamTrawl.
SIGLER, M., D. DeMASTER, P. BOVENG, M. CAMERON, E. MORELAND, K. WILLIAMS, and R. TOWLER.
2015. Advances in methods for marine mammal and fish stock assessments: Thermal imagery and CamTrawl. Mar. Tech. Soc. J. 49:99-107.
- Results of the acoustic-trawl survey of walleye pollock (Gadus chalcogrammus) on the U.S. and Russian Bering Sea Shelf in June - August 2014 (DY1407).
HONKALEHTO, T., and A. McCARTHY.
2015. Results of the acoustic-trawl survey of walleye pollock (Gadus chalcogrammus) on the U.S. and Russian Bering Sea Shelf in June - August 2014 (DY1407). AFSC Processed Rep. 2015-07, 62 p. Alaska Fish. Sci. Cent., NOAA, Natl. Mar. Fish. Serv., 7600 Sand Point Way NE, Seattle WA 98115. (.pdf, 2.37 MB). Online.
- Surveying Euphausiid Abundance to Understand the Central Gulf of Alaska Ecosystem
By: KIRSTEN A. SIMONSEN, CHRISTOPHER N. ROOPER, MARTIN DORN, and STEPHANI ZADOR, PATRICK H. RESSLER
Conference: Alaska Marine Science Symposium, Anchorage, AK, Jan 2016
(2016 poster, .pdf, 1.49 MB) Online.
- Can a Bottom-Moored Echosounder Array Provide a Survey-comparable Index of Abundance?
By: ALEX De ROBERTIS, ROBERT LEVINE, CHRIS WILSON, SCOTT FURNISH, IVAR WANGEN
Conference: ICES Symposium on Marine Ecosystem Acoustics, Nantes, France, May 2015
(2015 poster, .pdf, 6.6 MB) Online.
See the publications and poster databases for additional listings.