Long-term measurements of fish backscatter from Saildrone unmanned surface vehicles and comparison with observations from a noise-reduced research vessel

De Robertis, Alex; Lawrence-Slavas, Noah; Jenkins, Richard; Wangen, Ivar; Mordy, Calvin W; Meinig, Christian; Levine, Mike; Peacock, Dave; Tabisola, Heather

doi:10.1093/icesjms/fsz124

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Long-term measurements of fish backscatter from Saildrone unmanned surface vehicles and comparison with observations from a noise-reduced research vessel

2019
By De Robertis, Alex ; Lawrence-Slavas, Noah ; Jenkins, Richard ; ...
Source: ICES Journal of Marine Science, 76(7): 2459-2470

[PDF-991.70 KB]

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Journal Title:

ICES Journal of Marine Science
Personal Author:

De Robertis, Alex ; Lawrence-Slavas, Noah ; Jenkins, Richard ; Wangen, Ivar ; Mordy, Calvin W ; ... More +

De Robertis, Alex ; Lawrence-Slavas, Noah ; Jenkins, Richard ; Wangen, Ivar ; Mordy, Calvin W ; Meinig, Christian ; Levine, Mike ; Peacock, Dave ; Tabisola, Heather Less -
NOAA Program & Office:

NMFS (National Marine Fisheries Service) ; AFSC (Alaska Fisheries Science Center) ; OAR (Oceanic and Atmospheric Research) ; PMEL (Pacific Marine Environmental Laboratory) ; JISAO (Joint Institute for the Study of the Atmosphere and Ocean) ; ... More +

NMFS (National Marine Fisheries Service) ; AFSC (Alaska Fisheries Science Center) ; OAR (Oceanic and Atmospheric Research) ; PMEL (Pacific Marine Environmental Laboratory) ; JISAO (Joint Institute for the Study of the Atmosphere and Ocean) ; OMAO (Office of Marine and Aviation Operations) Less -
Description:

Two Saildrone unmanned surface vehicles (USVs) were instrumented with echosounders and deployed in the Bering Sea to make acoustic observations of walleye pollock for 103 days. The Saildrones proved to be a suitable platform for measurement of fish backscatter: they produced high-quality measurements at wind speeds of <10 m s−1. Pollock backscatter measured from the Saildrones was compared to backscatter measured by a noise-reduced research vessel during two “follow-the-leader” comparisons. In a location where pollock were shallowly distributed (30–100 m), there was evidence of depth-dependent avoidance reactions to the ship. This behaviour was not evident in a second comparison, where the fish were primarily deeper than 90 m. Opportunistic comparisons indicate that backscatter where the ship and USVs crossed paths was similar. However, the Saildrones observed higher densities of shallow fish, which is consistent with the diving response inferred in the first follow-the-leader comparison. USVs equipped with echosounders, like all platforms, have inherent strengths (endurance) and limitations (species identification) that should be carefully considered for a given application. USVs can complement traditional ship-based surveys by increasing the spatial and temporal extent of acoustic observations, and their use is likely to become more widespread.
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Observations Vehicles, Remotely Piloted
Source:

ICES Journal of Marine Science, 76(7): 2459-2470
DOI:

https://doi.org/10.1093/icesjms/fsz124
Document Type:

Journal Article
Funding:

Grant no. NA15OAR4320063
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Submitted
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urn:sha256:b0c4655dc7123b640a020a64f0f828bbde6265acba7654e0d555ad1f4124788f
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https://repository.library.noaa.gov/view/noaa/39045/noaa_39045_DS1.pdf
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Long-term measurements of fish backscatter from Saildrone unmanned surface vehicles and comparison with observations from a noise-reduced research vessel

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