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new article in Fisheries Science

Subject: new article in Fisheries Science
From: Sonja Amoser <>
Date: Thu, 07 Oct 2004 11:30:15 -0700
In Fisheries Science, Vol. 70(5), October 2004, I found
 the following article:
 Donhyug KANG, Kazuhiro SADAYASU, Tohru MUKAI, Kohji IIDA, Doojin HWANG,
 Kouichi SAWADA, Kazushi MIYASHITA (2004): Target strength estimation of
 black porgy Acanthopagrus schlegeli using acoustic measurements and a
 scattering model. Fisheries Science, Vol. 70(5), 819-828.
 Abstract: Black porgy are hatched and released in marine ranching areas in
 Japan, Korea and Taiwan to maintain fisheries resources in coastal areas. If
 acoustic methods are used for field surveys, target strength (TS)
 information on the species is needed to convert acoustic data to biomass
 density. Target strength of black porgy (Acanthopagrus schlegeli) 15.5-32.9
 cm fork length (nine individuals) was measured at 38 and 120 kHz (split
 beam) by ex situ measurements (cage and fishhook methods) of living fish, a
 tethered method with shock-frozen fish, and an acoustic scattering model,
 the Kirchhoff ray mode (KRM) model based on fish morphology. The ex situ
 TS-to-fork length (FL, cm) relationships were TS38kHz = 20log10FL  64.6 (r =
 0.77) and TS120kHz = 20log10FL  65.2 (r = 0.70). The values for the KRM
 model were TS38kHz = 20log10FL  64.8 (r = 0.88) and TS120kHz = 20log10FL
 65.4 (r = 0.80). The agreement between the ex situ measurements and the KRM
 model for the mean TS was very good. In contrast, the results for the
 tethered method (TS38kHz = 20log10FL  69.3 [r = 0.42]) differed markedly
 from the other two methods, perhaps because of the effects of the
 shock-freezing procedure in air. The results of the ex situ measurements and
 scattering model provide basic information for studying TS and conducting
 acoustic surveys of black porgy, even though the tethered method must be
 Sonja Amoser
 PhD Student, Research Associate University of Vienna, Institute of Zoology
 Althanstrasse 14, 1090 Vienna, Austria 
 tel: +43 (1) 4277 54467
 fax: +43 (1) 4277 54406 

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