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Ex situ echo sounder target strengths of ice krill Euphausia crystallorophias

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Title
Ex situ echo sounder target strengths of ice krill Euphausia crystallorophias
Authors
La, Hyoung Sul
Lee, Hyungbeen
Kang, Donhyug
Lee, SangHoon
Shin, Hyoung Chul
Subject
Marine & Freshwater Biology; Oceanography
Keywords
Ice krill; Euphausia crystallorophias; Ex situ target strength; Split-beam echo sounder
Issue Date
2015
Citation
La, Hyoung Sul, et al. 2015. "Ex situ echo sounder target strengths of ice krill Euphausia crystallorophias". Chinese Journal of Oceanology and Limnology, 33(3): 802-808.
Abstract
Ice krill is the keystone species in the neritic ecosystem in the Southern Ocean, where it replaces the more oceanic Antarctic krill. It is essential to understand the variation of target strength (TS in dB re 1 m 2 ) with the different body size to accurately estimate ice krill stocks. However, there is comparatively little knowledge of the acoustic backscatter of ice krill. The TS of individual, formalin-preserved, tethered ice krill was measured in a freshwater test tank at 38, 120, and 200 kHz with a calibrated split-beam echo sounder system. Mean TS was obtained from 21 individual ice krill with a broad range of body lengths ( L : 13-36 mm). The length ( L , mm) to wet weight ( W ; mg) relationship for ice krill was W =0.001 218×103 × L 3.53 ( R2 =0.96). The mean TS-to-length relationship were TS 38 kHz =-177.4+57log10 ( L ), ( R2 = 0.86); TS 120 kHz = -129.9+31.56log 10 ( L ), ( R 2 =0.87); and TS 200 kHz =-117.6+24.66log 10 ( L ), ( R 2 =0.84). Empirical estimates of the relationship between the TS and body length of ice krill were established at 38, 120, and 200 kHz and compared with predictions obtained from both the linear regression model of Greene et al. (1991) and the Stochastic Distorted Wave Born Approximation (SDWBA) model. This result might be applied to improve acoustic detection and density estimation of ice krill in the Southern Ocean. Further comparative studies are needed with in situ target strength including various body lengths of ice krill.
DOI
http://dx.doi.org/10.1007/s00343-015-4064-3
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