Ex situ echo sounder target strengths of ice krill Euphausia crystallorophias SCIE SCOPUS

Cited 3 time in WEB OF SCIENCE Cited 3 time in Scopus
Title
Ex situ echo sounder target strengths of ice krill Euphausia crystallorophias
Author(s)
La, Hyoung Sul; Lee, Hyungbeen; Kang, Donhyug; Lee, SangHoon; Shin, Hyoung Chul
KIOST Author(s)
Kang, Don Hyug(강돈혁)
Publication Year
2015-05
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=0.001218x10(3) x L (3.53) (R (2) =0.96). The mean TS-to-length relationship were TS38 kHz =-177.4+57log(10) (L), (R (2) = 0.86); TS120 kHz = -129.9+31.56log(10) (L), (R (2) =0.87); and TS200 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.
ISSN
0254-4059
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/2498
DOI
10.1007/s00343-015-4064-3
Bibliographic Citation
CHINESE JOURNAL OF OCEANOLOGY AND LIMNOLOGY, v.33, no.3, pp.802 - 808, 2015
Publisher
SCIENCE PRESS
Subject
ANTARCTIC KRILL; ROSS-SEA; ACOUSTIC SCATTERING; 120 KHZ; SUPERBA; ZOOPLANKTON; ABUNDANCE; ORIENTATION; MODEL
Keywords
ice krill; Euphausia crystallorophias; ex situ target strength; split-beam echo sounder
Type
Article
Language
English
Document Type
Article
Publisher
SCIENCE PRESS
Related Researcher
Research Interests

Marine security,Underwater Acoustics,해양방위,수중음향

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