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Swimbladder on Fish Target Strength

Author(s): Sunardi | Anton Yudhana | Jafri Din | Raja Bidin Raja Hassan

ISSN 1693-6930

Volume: 06;
Issue: 2;
Start page: 139;
Date: 2008;
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Keywords: acoustic fish model | target strength | swimbladder

This paper discusses of target strength (TS) for the Selar boops (Oxeye scad) and Megalaspis cordyla (Torpedo scad), the most commercially fish in Malaysia. TS can be determined from in situ measurements and acoustic calculation of fish model. TS value, depth, and position (x-y-z) of targeted fish can be viewed from echogram using FQ-80 Analyzer by in situ measurement. X-ray imaged can be deployed to develop the acoustic fish model. The percentage of length and upper surface area for swimbladder to body fish of Selar boops more than Megalaspis cordyla can be measured after X-ray process. The percentage of width and volume of swimbladders to its each body are no significantly difference for both fish. These data of swimbladder physic support the result of in situ measurement which TS of Megalaspis cordyla stronger Selar boops.
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