Search Results - "Knudsen, Frank Reier"

Acoustic scattering from a larval insect ( Chaoborus flavicans) at six echosounder frequencies: Implication for acoustic estimates of fish abundance by Knudsen, Frank Reier, Larsson, Petter, Jakobsen, Per Johan

“…Acoustic scattering from Chaoborus flavicans larvae was studied in a virtually fishless lake using multi-frequency split-beam echosounders with 7° partly…”
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Benefits from horizontal beaming during acoustic survey: application to three Norwegian lakes by Knudsen, Frank Reier, Sægrov, Harald

“…The abundance of fish in three contrasted Norwegian freshwater lakes (different species, depth, habitat) was measured in August and September 1999 by echo…”
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Target strengths and echotraces of whales and seals in the Canadian Beaufort Sea by Geoffroy, Maxime, Rousseau, Shani, Knudsen, Frank Reier, Fortier, Louis

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An evaluation of active acoustic methods for detection of marine mammals in the Canadian Beaufort Sea by Pyć, Cynthia D., Geoffroy, Maxime, Knudsen, Frank Reier

“…A commercially available fisheries sonar was mounted on an icebreaker and evaluated during an environmental baseline study in the Canadian Beaufort Sea, to…”
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Echo-sounding can discriminate between fish and macroinvertebrates in fresh water by JURVELIUS, JUHA, KNUDSEN, FRANK REIER, BALK, HELGE, MARJOMÄKI, TIMO J, PELTONEN, HEIKKI, TASKINEN, JOUNI, TUOMAALA, ANTTI, VILJANEN, MARKKU

“…1. Acoustic scattering from fish and macroinvertebrates was studied in a boreal Finnish lake at three echosounder frequencies (38, 120 and 200 kHz). Split-beam…”
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Hydroacoustic observations indicating swimbladder volume compensation during the diel vertical migration in coregonids ( Coregonus lavaretus and Coregonus albula) by Knudsen, Frank Reier, Gjelland, Karl Øystein

“…The diel vertical migration of whitefish ( Coregonus lavaretus) and vendace ( Coregonus albula) was studied in a lake using bottom mounted echosounder…”
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Influence of light on the swimming speed of coregonids in subarctic lakes by Gjelland, Karl Øystein, Bøhn, Thomas, Knudsen, Frank Reier, Amundsen, Per-Arne

“…Swimming speed of pelagic whitefish (Coregonus lavaretus) and vendace (Coregonus albula) was studied in two subarctic lakes at 69°N in northern Norway in June,…”
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HYDROACOUSTIC FISH ASSESSMENT IN SHALLOW WATER ENVIRONMENTS by KNUDSEN, FRANK REIER

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