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new articles in Fisheries Science, Vol 70(3), 2004

Subject: new articles in Fisheries Science, Vol 70(3), 2004
From: Sonja Amoser <>
Date: Wed, 09 Jun 2004 10:07:17 -0700
Yoshinori MIYAMOTO, Tamami SAKAI, Masahiko FURUSAWA, Yasuhiko NAITO
 (2004): Development of high-frequency micro echo sounder. Fisheries
 Science; Volume 70, Issue 3, Page 381-388
 The authors have developed a micro echo sounder operating at a frequency
 as high as 1 MHz, which can be attached to aquatic animals in
 combination with a depth and temperature sensor to obtain information on
 the animal's prey as well as its behavior. The performance of the
 sounder was evaluated in an experimental tank and its detection range
 was estimated to confirm its effectiveness. The beam width is 5.9° and
 the maximum detection distance is estimated as 34 m when the target
 strength of an object animal is 50 dB.
 Seiji OHSHIMO (2004): Spatial distribution and biomass of pelagic fish
 in the East China Sea in summer, based on acoustic surveys from 1997 to
 2001. Fisheries Science; Volume 70, Issue 3, Page 389 ff
 Annual acoustic surveys were conducted using a quantitative echo sounder
 (frequency: 38 kHz) in the East China Sea from July to September of
 1997-2001. Three groups of fish were identified from the echograms,
 based on school shape and swimming depth characteristics: (i) anchovy
 Engraulis japonicus and round herring Etrumeus teres; (ii) jack mackerel
 Trachurus japonicus and chub mackerel Scomber japonicus; and (iii)
 lantern fish Diaphus spp. and pearlside Maurolicus japonicus. The area
 backscattering strength (Sa) of each group was divided by the total
 weight of fish species caught in midwater trawls. Anchovy, round
 herring, jack mackerel, lantern fish and pearlside were the most
 abundant. The estimated biomass indices of anchovy and round herring
 were positively correlated with the commercial landings of these
 species, indicating the usefulness of acoustic surveys.
 Sonja Amoser
 Mag. Sonja Amoser
 Institut of Zoology, University of Vienna
 Althanstrasse 14, 1090 Vienna, Austria
 Tel: +43-1-4277-54515

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