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    Results from the WG-ASAM intersessional e-group on Krill biomass estimates from acoustic surveys

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    Document Number:
    WG-EMM-2021/05 Rev. 1
    Author(s):
    WG-ASAM e-group on Krill biomass estimates from acoustic surveys
    Submitted By:
    Dr George Watters (United States of America)
    Approved By:
    Dr George Watters (United States of America)
    Abstract

    Based on the direction of WG-ASAM during 2021, an e-group was established to develop a method to provide estimates of krill biomass for use in the GRYM and for development of a management strategy for krill. Krill biomass densities at a variety of spatial scales are presented for consideration by WG-EMM in 2021. The mean biomass density ranges from a low of 45.54 gm m-2 for the time series averaged over the time since adoption of CM5107 to a high of 64.34 gm m-2 when the time series is averaged over just the last 3 yrs of sampling. Importantly embedded within this time series is a low frequency quasi-decadal variability with several periods when krill biomass density is much lower than the longterm mean of ~52 gm m-2.

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