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Hydroacoustic Measurement of the Density of the Baikal Macrozooplankter Macrohectopus branickii

N. G. Melnik, O. A. Timoshkin, V. G. Sideleva, S. V. Pushkin and V. S. Mamylov
Limnology and Oceanography
Vol. 38, No. 2 (Mar., 1993), pp. 425-434
Stable URL: http://www.jstor.org/stable/2837822
Page Count: 10
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Hydroacoustic Measurement of the Density of the Baikal Macrozooplankter Macrohectopus branickii
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Abstract

Experimental studies and statistical analyses were performed to evaluate hydroacoustic methods for assessing the density of Macrohectopus branickii (Amphipoda, Gammaridae) in Lake Baikal. Minimal registered abundance (expressed as volume) appeared to be $<1 mg m^-3$ (echosounder at a frequency of 200 kHz). Patterns of Macrohectopus diel vertical migration varied with individual age, size, and sex. It is preferable to assess abundance of Macrohectopus at night when the population is distributed primarily in the upper 100 m. Under these conditions, acoustic estimates of animal densities can be made by applying calculated data on the scattering ability of Macrohectopus within the size range of 1-30 mm: TS(kg) = -36.8 ± 0.5 dB kg-1 (mean ± 95% C.I.).

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