Estudio bioacústico del krill (Euphausia superba) en el estrecho de Bransfield, Antártida

Carlos Martín Salazar Céspedes; Oswaldo Flores Huamán; Adolfo Gonzales Salas; Rodolfo Cornejo Urbina; Carlos Paulino Rojas

Authors

Carlos Martín Salazar Céspedes Instituto del Mar del Perú
Oswaldo Flores Huamán Instituto del Mar del Perú
Adolfo Gonzales Salas Instituto del Mar del Perú
Rodolfo Cornejo Urbina Instituto del Mar del Perú
Carlos Paulino Rojas Instituto del Mar del Perú

Keywords:

Bioacoustics, Euphausia superba, Antartica

Abstract

Hydroacoustic evaluation of the distribution and biomass of krill (E. superba) was held on board the BIC Humboldt, in February 2013. The area evaluated between the Bransfield Strait and near the Gibbs Island totaling 11,712 nm2. During the day, krill swarms were record at high densities between 20 and 50 m deep, during the night dispersed and scattered swarms were detect from the surface to 20 m deep. The highest densities were observe at the eastern end of Bransfield Strait, followed by a regular distribution between the islands King George and Gibbs with average densities (500-1,000 m/mn²) and high (> 1000 m/mn²). A low density core was observed between Deception and Torre islands. The temperature range of the swarms of krill was between -1.0 and 1.5 °C. Aggregations of krill were observe between 33.96 and 34.35 ups salinity. A hydroacoustic biomass of krill 876.368 t was estimated by Stochastic Distorted Wave Approximation (SDWBA) method.

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