Comparing acoustic classification methods to estimate krill biomass in the Georges Bank region from 1999 to 2012

Krill are a critical component of northern‐latitude ecosystems, yet are poorly monitored in the Gulf of Maine and Georges Bank regions of the northeast United States continental shelf. We applied five acoustic classification methods (multifrequency single‐beam index [MFSBI], dB‐differencing, multifrequency index [MFI], and two variations of the Z‐score method) to acoustic data collected during surveys conducted annually in the Georges Bank...