Acoustic estimates of krill biomass in the Elephant Island area: 1981–1993
Acoustic estimates of krill biomass in the vicinity of Elephant Island are presented for the years 1981 to 1993 (with the exception of 1982 and 1986). Estimates for 1981 to 1991 are based on previous reports adjusted for the recently proposed definition of krill target strength (Greene et al., 1991). Biomass estimates range from 267 x 103 tonnes (March/April 1985) to 4 880 x 103 tonnes (January 1993) and biomass densities range from 2.5 g/m2 to 134.5 g/m2. Average biomass and average density over the 13-year period were 1 703 x 103 tonnes and 53.2 g/2.