dc.contributor.author | Nortvedt, Ragnar | |
dc.date.accessioned | 2012-07-03T09:27:04Z | |
dc.date.available | 2012-07-03T09:27:04Z | |
dc.date.issued | 1986 | |
dc.identifier.citation | This report is not to be cited without prior reference to the author | no_NO |
dc.identifier.uri | http://hdl.handle.net/11250/104159 | |
dc.description.abstract | Atlantic salmon (Salmo salar) and rainbow trout (S. gairdneri)
eggs were incubated in plexi-glass aquariums. After hatching,
alevins were kept in darkness, two groups of each species without substrate, two groups in gravel and two groups in Astroturf artificial substrate.
Every sixth day after hatching until the end of emergence,
their activity was monitored with a video recording system in
a five minutes period of darkness, followed by five minutes
exposure to light. The use of ordinary 60 watts bulb lights
and infrared light, made it possible to measure their swimming
distances within a definite coordinate system in the aquariums,
both in darkness and under illumination.
Alevins of both species showed a higher activity when incubated
without substrate than those within the two substrates.
The differences in activity were, however, least developed between
the groups of rainbow trout.
Activity, caused by lack of ventra lateral support among
the flat screen reared Atlantic salmon alevins, was most conspicuous
between days 8 and 23. Illumination caused increasing
activity until days 28 and 40 of rainbow trout and Atlantic
salmon, respectively. The presentation of food stimulated the
alevins to increase their activity. | no_NO |
dc.language.iso | eng | no_NO |
dc.publisher | ICES | no_NO |
dc.relation.ispartofseries | ICES CM Documents;1986/F:24 | |
dc.subject | salmonids | no_NO |
dc.subject | laksefisker | no_NO |
dc.subject | growth | no_NO |
dc.subject | vekst | no_NO |
dc.subject | juvenile production | no_NO |
dc.subject | yngelproduksjon | no_NO |
dc.title | The activity of alevins of Atlantic salmon and rainbow trout, incubated on different substrates | no_NO |
dc.type | Working paper | no_NO |
dc.subject.nsi | VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Resource biology: 921 | no_NO |
dc.subject.nsi | VDP::Mathematics and natural science: 400::Zoology and botany: 480::Marine biology: 497 | no_NO |
dc.subject.nsi | VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920::Fish health: 923 | no_NO |
dc.source.pagenumber | 52 s. | no_NO |