AFSC/RACE/MACE: Results of 2020 acoustic saildrone survey Eastern Bering Sea SD1043_2020-01

Eastern Bering Sea shelf walleye pollock (Gadus chalcogrammus) midwater abundance and distribution were assessed using 3 Saildrone autonomous vehicles due to Covid-19 restrictions.

NOAA Fisheries/Alaska Fisheries Science Center (AFSC) acoustic stock assessment surveys of walleye pollock (Gadus chalcogrammus) in the eastern Bering Sea area of the Gulf of Alaska (EBS) conducted on 4 July-20 August 2020 using three saildrone uncrewed surface vehicles (USVs).

The EK80 echosounder system transducers installed on the saildrones are mounted in a gimbal mount on the vehicle keel at a depth of 1.9 m (i.e. draft correction setting of 1.9 meters below the surface should be applied). Data during the survey were collected at a pulse length of 0.512 milliseconds. Note that some data during transits in deeper water in this data set were collected at pulse length of 1.024 milliseconds.

https://doi.org/10.1093/icesjms/fsab155

Enter supplemental information if applicable.

Enter an overview of the data set's entity and attribute information.

Enter a citation for detailed information on the data set's entities and attributes.

Enter the distribution liability statement.

Enter a general description of the extent, if any.

Go to https://www.ngdc.noaa.gov/mgg/wcd/ or email Anderson, Charles (charles.anderson@noaa.gov)

The data set has been analyzed and published, data are available.

User must read and fully comprehend the metadata prior to use. User must acknowledge the Originator when using the data set as a source. User must share data products developed using the source data set with the Originator. Data should not be used beyond the limits of the source scale.

These data were collected in accordance with NOAA protocols for saildrone surveys and related sampling. Publication available online: ICES Journal of Marine Science (2021), https://doi.org/10.1093/icesjms/fsab155

If the delay between data collection and dissemination is longer than the latency of automated processing, explain under what authority data access is delayed. This field should only be included if the delay is longer than the latency of automated processing.

IT Security and Contingency Plan for the system establishes procedures and applies to the functions, operations, and resources necessary to recover and restore data as hosted in the Western Regional Support Center in Seattle, Washington, following a disruption.

The primary water column acoustic instrument for the survey was a Simrad EK80 mini scientific echosounder system equipped with a dual frequency ES38-18/200-18CR transducer (38 kHz split-beam, 200 kHz single beam). Data were analyzed using Myriax Echoview post-processing software.