Evaluation of potential bias in observing fish with a DIDSON acoustic camera

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60076658%3A12310%2F14%3A43887408" target="_blank" >RIV/60076658:12310/14:43887408 - isvavai.cz</a>
Alternative codes found
RIV/60076658:12510/14:43887408
Result on the web
<a href="http://www.sciencedirect.com/science/article/pii/S0165783614000770" target="_blank" >http://www.sciencedirect.com/science/article/pii/S0165783614000770</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.fishres.2014.02.031" target="_blank" >10.1016/j.fishres.2014.02.031</a>

Result language
angličtina
Original language name
Evaluation of potential bias in observing fish with a DIDSON acoustic camera
Original language description
The DIDSON multi-beam sonar has become a popular tool for monitoring fish. The aim of this study was to determine how well the DIDSON sonar can detect and measure fish during stationary applications in lakes. Cyprinid fish of known sizes (10-60 cm long)and with horizontal body orientations were deployed in known positions at two ranges (6.3 and 9.5 m) within a DIDSON high-frequency array of beams. A new method for estimating fish length from multi-beam sonars was thus developed and applied. At both ranges, all the deployed fish were invariably detected when they were aligned with their sides perpendicular to the beam. Increasing fish body angle, however, reduced the ability of the system to detect fish. Only the largest fish were detectable when the fish were parallel to the beam (head or tail aspect). The estimated fish length agreed well with the actual length when the fish were positioned perpendicular to the center of the multi-beam array. The lengths were underestimated for fish
Czech name
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Czech description
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Type
J<sub>x</sub> - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)
CEP classification
EG - Zoology
OECD FORD branch
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Project
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Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year
2014
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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