Summary
The depth distributions of krill density with the resolution of 0.435 m has been obtained on the basis of SIBEX hydroacoustic data. Krill was observed to be mainly in a layer from 20 to 100 m with the maximum of biomass migrating from the near surface area at night to greater depths during day. The krill migration pattern can be described by the function: H(t)=A+Bcos (2πt/T+ϕ), where H is depth of the mass center of biomass, t-time, A-mean depth of krill occurrence, B-amplitude of diurnal changes, T=24 h and ϕ-phase of migration process. The parameters of migration pattern: A, B, T and ϕ depend on the body length of krill.
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Godlewska, M., Klusek, Z. Vertical distribution and diurnal migrations of krill — Euphausia superba Dana — from hydroacoustical observations, SIBEX, December 1983/January 1984. Polar Biol 8, 17–22 (1987). https://doi.org/10.1007/BF00297159
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DOI: https://doi.org/10.1007/BF00297159