Acoustic-Trawl Survey of Walleye Pollock on the Eastern Bering Sea Shelf (DY1407, EK60). National Marine Fisheries Service (NMFS), Alaska Fisheries Science Center (AFSC) conducted an acoustic-trawl (AT) stock assessment survey on the eastern Bering Sea shelf during late spring/summer of 2014 to estimate the distribution and abundance of walleye pollock (Gadus chalcogrammus). The survey was conducted from Bristol Bay in the U.S. to Cape Navarin, RusThe Midwater Assessment and Conservation Engineering (MACE) program of NOAA sia, 12 June to 13 August aboard NOAA Ship Oscar Dyson, a 64 meter stern trawler equipped with acoustic and oceanographic instrumentation. The vessel departed Dutch Harbor, Alaska on 12 June and returned to Dutch Harbor on 13 August. The cruise was completed in three legs (leg 1, 12-30 June; leg 2, 4-22 July; leg 3, 26 July to 13 August), with all port calls in Dutch Harbor, Alaska. The primary instrument for the survey was a Simrad EK60 split-beam echosounder system utilizing five frequencies (18, 38, 70, 120, and 200 kHz).

Acoustic-Trawl Survey of Walleye Pollock on the U.S. and Russian Bering Sea Shelf (DY1207, EK60). The Midwater Assessment and Conservation Engineering (MACE) program of NOAA National Marine Fisheries Service (NMFS), Alaska Fisheries Science Center (AFSC) conducted an acoustic-trawl (AT) stock assessment survey on the U.S. and Russian Bering Sea shelf during late spring/summer of 2012 to estimate the distribution and abundance of walleye pollock (Theraga chalcogramma). The survey was conducted from Bristol Bay, eastern Bering Sea in the U.S. to Cape Navarin, Russia, 7 June to 10 August aboard NOAA Ship Oscar Dyson, a 64 meter stern trawler equipped with acoustic and oceanographic instrumentation. The vessel departed Dutch Harbor, Alaska on 7 June and returned to Dutch Harbor on 10 August. The cruise was completed in three legs (leg 1, 7-25 June; leg 2, 30 June to 18 July; leg 3, 23 July to 10 August), with all port calls in Dutch Harbor, Alaska. The EK60 echosounder system was calibrated prior to and at the end of the cruise in Captains Bay, Dutch Harbor, Alaska.

Southeastern Aleutian Basin (Bogoslof Island) Acoustic-Trawl Survey of Walleye Pollock (DY1603, EK60). The Midwater Assessment and Conservation Engineering (MACE) program of NOAA National Marine Fisheries Service (NMFS), Alaska Fisheries Science Center (AFSC) conducted acoustic-trawl (AT) stock assessment surveys in the Bogoslof Island area of the southeastern Aleutian Basin during late winter of 2016 to estimate the distribution and abundance of walleye pollock (Gadus chalcogrammus). The surveys were conducted 4-8 March, departing from Kodiak, Alaska (2 March) and included the Umnak and Samalga Pass area. The vessel returned to the Kodiak, Alaska area on 13 March to exchange scientific personnel and depart for the following cruise (Gulf of Alaska/Shelikof Strait survey, 14-21 March, cruise DY1604). The survey was conducted aboard NOAA Ship Oscar Dyson, a 64 meter stern trawler equipped with acoustic and oceanographic instrumentation.

Southeastern Aleutian Basin (Bogoslof Island) Acoustic-Trawl Survey of Walleye Pollock (DY1402, EK60). The Midwater Assessment and Conservation Engineering (MACE) program of NOAA National Marine Fisheries Service (NMFS), Alaska Fisheries Science Center (AFSC) conducted an acoustic-trawl (AT) stock assessment survey in the Bogoslof Island area of the southeastern Aleutian Basin during late winter of 2014 to estimate the distribution and abundance of walleye pollock (Gadus chalcogrammus). The survey was conducted 7-11 March, departing from Kodiak, Alaska (3 March) and arriving in Dutch Harbor, Alaska (11 March). The survey was conducted aboard NOAA Ship Oscar Dyson, a 64 meter stern trawler equipped with acoustic and oceanographic instrumentation. The primary instrument for the survey was a Simrad EK60 split-beam echosounder system utilizing five frequencies (18, 38, 70, 120, and 200 kHz).

Acoustic-Trawl Survey of Walleye Pollock on the U.S. and Russian Bering Sea Shelf (DY0909, EK60). The Midwater Assessment and Conservation Engineering (MACE) program of NOAA National Marine Fisheries Service (NMFS), Alaska Fisheries Science Center (AFSC) conducted an acoustic-trawl (AT) stock assessment survey on the U.S. and Russian Bering Sea shelf during late spring/summer of 2009 to estimate the distribution and abundance of walleye pollock (Theragra chalcogramma). The survey was conducted from Bristol Bay, eastern Bering Sea in the U.S. to Cape Navarin, Russia, 9 June to 7 August aboard NOAA Ship Oscar Dyson, a 64 meter stern trawler equipped with acoustic and oceanographic instrumentation. The vessel departed Kodiak, Alaska on 5 June and arrived in Dutch Harbor on 7 August. The cruise was completed in three legs (leg 1, 9-28 June; leg 2, 1-18 July; leg 3, 21 July to 7 August), with port calls in Dutch Harbor, Alaska; a personnel exchange occurred in Dutch Harbor on 21 June. Fisheries gear research operations were conducted on 16 June and again 3-5 August. The EK60 echosounder system was calibrated at the start of the cruise in Three Saints Bay, Kodiak Island, Alaska 10-11 June, and at the end of the cruise in Anderson Bay, Unalaska Island, Alaska 6-7 August.

Acoustic-Trawl Survey of Walleye Pollock in the Eastern Bering Sea (DY1608, EK60). The Midwater Assessment and Conservation Engineering (MACE) program of NOAA National Marine Fisheries Service (NMFS), Alaska Fisheries Science Center (AFSC) conducted an acoustic-trawl (AT) stock assessment survey on the eastern Bering Sea shelf during late spring/summer of 2016 to estimate the distribution and abundance of walleye pollock (Gadus chalcogrammus). The survey was conducted 12 June to 17 August aboard NOAA Ship Oscar Dyson, a 64 meter stern trawler equipped with acoustic and oceanographic instrumentation. The vessel departed Dutch Harbor, Alaska on 12 June and returned to Dutch Harbor on 17 August. The cruise was completed in three legs (leg 1, 12 June to 3 July; leg 2, 7-25 July; leg 3, 29 July to 17 August), with all port calls in Dutch Harbor, Alaska.

Southeastern Aleutian Basin (Bogoslof Island) Acoustic-Trawl Survey of Walleye Pollock (DY1202, EK60). The Midwater Assessment and Conservation Engineering (MACE) program of NOAA National Marine Fisheries Service (NMFS), Alaska Fisheries Science Center (AFSC) conducted acoustic-trawl (AT) stock assessment surveys in the Bogoslof Island area of the southeastern Aleutian Basin during the winter of 2012 to estimate the distribution and abundance of walleye pollock (Theraga chalcogramma). The surveys were conducted 5-15 March, departing from Kodiak, Alaska (4 March) and returning to Kodiak at the end of cruise DY1203 on 27 March; an intermediate personnel transfer was conducted in Kodiak on 19 March. The surveys were conducted aboard NOAA Ship Oscar Dyson, a 64 meter stern trawler equipped with acoustic and oceanographic instrumentation.

Acoustic-Trawl Survey of Walleye Pollock on the U.S. and Russian Bering Sea Shelf (DY1006, EK60). The Midwater Assessment and Conservation Engineering (MACE) program of NOAA National Marine Fisheries Service (NMFS), Alaska Fisheries Science Center (AFSC) conducted an acoustic-trawl (AT) stock assessment survey on the U.S. and Russian Bering Sea shelf during late spring/summer of 2010 to estimate the distribution and abundance of walleye pollock (Theragra chalcogramma). The survey was conducted from Bristol Bay, eastern Bering Sea in the U.S. to Cape Navarin, Russia, 7 June to 10 August aboard NOAA Ship Oscar Dyson, a 64 meter stern trawler equipped with acoustic and oceanographic instrumentation. The vessel departed Kodiak, Alaska on 5 June and arrived in Dutch Harbor on 7 August. The cruise was completed in three legs (leg 1, 5-24 June; leg 2, 29 June to 16 July; leg 3, 20 July to 7 August), with port calls in Dutch Harbor, Alaska; a personnel exchange occurred in Dutch Harbor on 18 June. Fisheries research operations were conducted on Snakehead plateau south of Kodiak Island 7-9 June and again in the Bering Sea 3-5 August. The EK60 echosounder system was calibrated at the start of the cruise in Three Saints Bay, Kodiak Island, Alaska 5-6 June, and at the end of the cruise in Anderson Bay, Unalaska Island, Alaska 6-7 August.

Acoustic-Trawl Survey of Walleye Pollock (Gadus chalcogrammus) on the U.S. Bering Sea shelf (DY1807, EK60). The Midwater Assessment and Conservation Engineering (MACE) program of NOAA Fisheries, Alaska Fisheries Science Center (AFSC) conducted an acoustic-trawl (AT) stock assessment survey on the U.S. Bering Sea shelf (EBS) between Bristol Bay and the U.S.-Russia Convention Line between 6 June and 29 August 2018; the adjoining Russian portion of the EBS shelf was not surveyed. The survey was conducted aboard NOAA Ship Oscar Dyson, a 64 meter stern trawler equipped with acoustic and oceanographic instrumentation. The survey was conducted in three legs with the vessel departing Dutch Harbor, Alaska on 6 June and the cruise ending in Kodiak, Alaska on 26 August. The vessel departed Dutch Harbor on 6 June to begin leg 1 survey operations and ended leg 1 in Dutch Harbor on 28 June. The vessel departed Dutch Harbor on 1 July for leg 2 with survey operations conducted 3-7 July. A mechanical issue required the vessel to return to Dutch Harbor on 8 July ending leg 2. Following vessel repairs 8-23 July, the vessel departed Dutch Harbor on 25 July with survey operations for leg 3 conducted 25 July to 10 August and returning to Dutch Harbor on 11 August. Leg 3 continued with vessel departure from Dutch Harbor on 14 August and survey conducted 15-20 August. The vessel transited to Kodiak, Alaska 21-25 August and arrived in Kodiak on 26 August. The primary acoustic instrument for the survey was a Simrad EK60 split-beam echosounder system utilizing five frequencies (18, 38, 70, 120, and 200 kHz). The vessel conducted a pre-cruise acoustic system calibration in Captains Bay, Dutch Harbor, Alaska on 7 June and a post-cruise calibration in Kalsin Bay, Kodiak Island, Alaska on 25 August.

California Current Ecosystem Survey 2006. The 2006 California Current Ecosystem Survey used two vessels: the NOAA FSV Oscar Dyson and the NOAA FRV David Starr Jordan. The plan was for the FSV Oscar Dyson was to survey the northern part and the FRV David Starr Jordan to survey the southern part using identical methods. However, equipment failures prevented trawling operations on the FRV David Starr Jordan, and trawling was only conducted from the FSV Oscar Dyson and the survey plan of the FSV Oscar Dyson was extended to cover the entire West Coast down to San Diego, California. Both vessels collected water samples from a CTD-rosette, ichthyoplankton samples from plankton nets and meteorological data from weather station sensors at prescribed and adhoc stations. At some of these and other locations, surface trawls were collected during night from the FSV Oscar Dyson. Underway operations on each ship included operating a continuous underway fish egg sampler (CUFES), an acoustic Doppler current profiler (ADCP), multiple-frequency split-beam echosounders and a multi-beam echosounder. Daytime underway operations included bird and mammal observations. The acoustic surveys were accomplished using Simrad EK60 split-beam echosounders. Four echosounders were operated on the David Starr Jordan at 38, 70, 120 and 200 kHz, and five were operated on the Oscar Dyson at 18, 38, 70, 120 and 200 kHz. Each 5 echosounder was calibrated prior to the survey using the standard sphere method.