Blar i Published by IMR på emneord "ekkolodd"
Viser treff 1-12 av 12
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Akustikk og fiskeåtferd: korleis kan vi observera åtferd og kva finn vi ut?
(Conference object, 2010-09-15) -
Automatisk fôringskontroll via ekkoloddregistrering av fôrpellets
(Havforskningsnytt, Working paper, 1991) -
Bergen Ekko Integrator
(Havforskningsnytt, Working paper, 1998) -
Bestandsmålinger kan nå gjøres med ekkolodd og sonar
(Havforskningsnytt, Working paper, 1996) -
En korreksjon til ekkoloddets dybdeangivelse
(Fisken og havet;1964 - Nr. 3, Research report, 1964)An echo sounder is adjusted for constant sound velocity, usually 1500 m/sec. Since the velocity of sound in the sea is varying with temperature, salinity and depth, a correction is necessary if accurate soundings are ... -
Kan måle fiskestørrelse før fangsting
(Havforskningsnytt;Nr. 6-2016, Working paper, 2016) -
Observation of fish behaviour, density and distribution around a surveying vessel by means of a deployable echo sounder system
(ICES CM documents, Working paper, 1999)Detailed acoustic obsewations of fish behaviour, distribution and density in the trawl area are necessary in order to establish quantitative relationships between trawl samples and fish density. Acoustic observation close ... -
Power-budget and echo-integrator equations for fish abundance estimation
(Fisken og Havet;10-2013, Research report, 2013-12-31)For abundance estimation and species identification on fisheries acoustic surveys, control with temperature and finite amplitude effects in the sea demands the calibration factor C of the conventional echo-integrator ... -
Rapport om tokt med F/F "Johan Hjort" til Vest Grønland i april/mai 1964
(Fisken og havet;1964 - Nr. 7, Journal article, 1964) -
Some methods for the generation of combined-frequency echograms
(Fisken og havet, Research report, 2002)Calibrated and digitised data from two or more discrete echo sounder frequencies can be combined for the purpose of separating and extracting the acoustic scattering from zooplankton and fish in mixed recordings. Methods ... -
Sonar kurs for fiskere
(Fisken og havet;1964 - Nr. 2, Journal article, 1964)