Echograms from the uncrewed surface vehicle survey demonstrating how scientists identify krill acoustically. Krill have relatively weak acoustic scattering at 38 kHz (A) and relatively strong acoustic scattering at 200 kHz (B)

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Echograms from the uncrewed surface vehicle survey demonstrating how scientists identify krill acoustically. Krill have relatively weak acoustic scattering at 38 kHz (A) and relatively strong acoustic scattering at 200 kHz (B)

© NOAA Fisheries

Echograms from the uncrewed surface vehicle survey demonstrating how scientists identify krill acoustically. Krill have relatively weak acoustic scattering at 38 kHz (A) and relatively strong acoustic scattering at 200 kHz (B) photo copyright NOAA Fisheries taken at and featuring the Environment class

Environment