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Appl. Sci. 2018, 8(9), 1536; https://doi.org/10.3390/app8091536

Acoustic Target Strength Measurements for Biomass Estimation of Aquaculture Fish, Redlip Mullet (Chelon haematocheilus)

1
Maritime Security and Safety Research Center, Korea Institute of Ocean Science & Technology (KIOST), Busan 49111, Korea
2
Department of Ocean System Engineering, Jeju National University, Jeju 63243, Korea
3
MT-IT Collaborations Center, Gwangju Institute of Science & Technology (GIST), Gwangju 61005, Korea
*
Author to whom correspondence should be addressed.
Received: 28 July 2018 / Revised: 30 August 2018 / Accepted: 31 August 2018 / Published: 2 September 2018
(This article belongs to the Special Issue Fishery Acoustics, Applied Sciences and Practical Applications)
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Abstract

Redlip mullet (Chelon haematocheilus) is distributed in coastal waters of the North-Western Pacific Ocean and is a cultured fish in Korea. A hydroacoustic technique constitutes a useful method to assess the biomass and spatial distribution of mullet in sea cages or in coastal waters, and acoustic target strength (TS) information of the target fish is an essential parameter in using this method. In this study, ex situ TS measurements of 16 live mullets were made in an aquaculture sea cage in Korea. The split-beam scientific echo-sounder used for measurements was comprised of 38, 120, 200, and 420 kHz frequencies. An underwater video camera was simultaneously used to observe the mullets’ behavior during the TS measurements. The mullet TS data was analyzed from a wide range of total fish length (FL: 14.3–40.3 cm). As results for all frequencies, the frequency dependence of the mean TS values were relatively low, and the difference in mean TS was within 2.5 dB. When the slope of the least-squares regression line was forced to 20 into the TS equation, the resulting value for the constant term (b20) at each frequency was −67.0 dB, −68.3 dB, −66.3 dB, and −68.5 dB, respectively. The data tended to be frequency dependent. Additionally, the maximum TS appeared between tilt angles of 0° and 10°. These results indicate that TS measurements can be applied to estimate the biomass of the mullet in sea cages or in coastal waters. View Full-Text
Keywords: Target strength (TS); Redlip mullet (Chelon haematocheilus); ex situ measurement; TS function Target strength (TS); Redlip mullet (Chelon haematocheilus); ex situ measurement; TS function
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Kim, H.; Kang, D.; Cho, S.; Kim, M.; Park, J.; Kim, K. Acoustic Target Strength Measurements for Biomass Estimation of Aquaculture Fish, Redlip Mullet (Chelon haematocheilus). Appl. Sci. 2018, 8, 1536.

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