Changes of acoustic target strength during juvenile perch development

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60076658%3A12310%2F04%3A00005273" target="_blank" >RIV/60076658:12310/04:00005273 - isvavai.cz</a>
Alternative codes found
RIV/60077387:_____/04:00104271
Result on the web
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DOI - Digital Object Identifier
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Result language
angličtina
Original language name
Changes of acoustic target strength during juvenile perch development
Original language description
Dependence of acoustic size (target strength-TS in dB) on body length of juvenile perch (Perca fluviatilis L.) was studied. Perch larvae were reared in a laboratory tank from spawning to the age of 89 days. Fish length and TS were measured during 3, 7, 15, 22, 45 and 89 days of life. TS was measured using a Simrad 500 EY split-beam echosounder with the frequency 120 kHz and a BioSonics Model 101 dual-beam echosounder with the frequency 420 kHz in down-looking, horizontal and up-looking directions. Rangeof fish body length 7-41 mm corresponded with a TS range from -69 to -53 dB. Differences between TS of different aspects were not found in young fish larvae. TS in ventral and dorsal aspects appears to grow faster than in the side aspect for fish 15-30mm long. With perch larger than 40 mm, vertical and side aspects reach similar values. This paper provides regressions for the size identification of acoustically detected fish targets. The results indicate that the TS/length relationship
Czech name
Změny akustické síly ozvů během ranného vývoje okouna říčního
Czech description
Článek se zabývá sledováním změn akustické síly ozvů během ranného vývoje okouna říčního v závislosti ne jeho velikosti.

Type
J<sub>x</sub> - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)
CEP classification
GL - Fishery
OECD FORD branch
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Project
Result was created during the realization of more than one project. More information in the Projects tab.
Continuities
Z - Vyzkumny zamer (s odkazem do CEZ)

Publication year
2004
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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