Browsing Published in cooperation with others by Author "Axelsen, Bjørn Erik"
Now showing items 1-7 of 7
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Await in the pelagic: herring compromising reproduction and survival within a vertically split school
Axelsen, Bjørn Erik; Misund, Ole Arve; Fernö, Anders; Nøttestad, Leif; Johannessen, Arne (ICES CM documents, Working paper, 1998) -
Impact of herring spawning behaviour on acoustic abundance estimates
Skaret, Georg; Fernö, Anders; Nøttestad, Leif; Johannessen, Arne; Axelsen, Bjørn Erik (ICES CM documents, Working paper, 2001)Spawning dynamics of Norwegian spring spawning herring was studied in south western Norway 29 March to 3 April 2000 using hydroacoustics. The horizontal distribution of the spawning layers shifted in a south-easterly ... -
In situ of Cape horse mackerel (Trachurus capensis)
Axelsen, Bjørn Erik (ICES CM Documents;1999/J:4, Working paper, 1999)The acoustical target strength (TS) of Cape horse mackerel (Trachurus capensis) was measured in situ at 38 kHz using a submersible split beam transducer in combination with a SIMRAD EK 500 echosounder. The transducer ... -
Pinging down the food web: multi-frequency acoustic discrimination of jellyfish and fish
Lynam, Christopher P.; Brierley, Andrew S.; Axelsen, Bjørn Erik (ICES CM Documents;2004/R:6, Working paper, 2004)Jellyfish are gaining increasing prominence in many pelagic marine ecosystems worldwide. It has been argued that jellyfish-dominated communities will be the end-point in ecosystems perturbed by high fishing effort, and ... -
Schooling dynamics of spawning herring (Clupea harengus L.) in a bay in South-Western Norway
Axelsen, Bjørn Erik; Misund, Ole Arve (PINRO-IMR Symposium, Conference object, 1997)The schooling dynamics of hening (Clupea harengta L.) was investigated during spawning in Raunefjord, south-westem Norway in 1994. A single school of Nonvegian spring spawning hening WSS) was tracked during daytime over ... -
A sonar study of the migration pattern of Norwegian spring-spawning herring (Clupea harengus L.) in July
Kvamme, Cecilie; Nøttestad, Leif; Fernö, Anders; Misund, Ole Arve; Dommasnes, Are; Axelsen, Bjørn Erik (ICES CM documents, Working paper, 2000)About 700 schools of Norwegian spring-spawning herring (Clupea harengus L.) were tracked by multi-beam sonar during transect surveys in the Norwegian Sea in July 1995 and 1996. This herring stock usually concentrates in ... -
Spatial and temporal overlap and trophic interactions between Atlantic Saithe (Pollachius virens) and Norwegian spring spawning herring (Clupea harengus) on herring spawning grounds
Slotte, Aril; Runde, Arne; Skaret, Georg; Axelsen, Bjørn Erik; Fernö, Anders; Johannessen, Arne; Nøttestad, Leif; Øvredal, Jan Tore (ICES CM documents, Working paper, 2005)Atlantic saithe (Pollachius virens) and Norwegian spring-spawning herring (Clupea harengus) represent two of the most abundant and ecologically important fish species in the Northeast Atlantic. The two species co-occur ...