Browsing Brage IMR by Author "Fonn, Merete"
Now showing items 1-14 of 14
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A comparison of egg quality and larval viability between cultured coastal cod and wild arcto-norwegian cod
Solemdal, Per; Kjesbu, Olav Sigurd; Opstad, Ingegjerd; Skiftesvik, Anne Berit; Birkeland, R.; Bratland, Per; Fonn, Merete (ICES CM documents;1991/F:41;, Working paper, 1991)Experiments on cod eggs revealed an inverse relationship between egg diameter and mortality. Further, larvae hatching from small eggs showed a redeuced feeding ability. Other methods to characterice larval viability ... -
Condition monitoring in the water column 2008: Oil hydrocarbons in fish from Norwegian waters
Grøsvik, Bjørn Einar; Meier, Sonnich; Liewenborg, Birgitta; Nesje, Guri; Westrheim, Kjell; Fonn, Merete; Kjesbu, Olav Sigurd; Klungsøyr, Jarle (Rapport fra Havforskningen;Nr.2-2009, Working paper, 2009-06)The objectives for this study have been: 1. Measure NPD/PAH in haddock liver from the Egersund Bank, the Halten Bank andthe Barents Sea. 2. Determine to what extent fish from the oil installation areas at Tampen and the ... -
Egg mortality in recruit- and repeat-spawning cod: an experimental study
Solemdal, Per; Kjesbu, Olav Sigurd; Fonn, Merete (ICES CM documents, Working paper, 1995)Experiments on the reproduction of individual Norwegian coastal cod and for the Arcto-Norwegian cod were conducted during the years 1982-92, and the year 1995 respectively. The experimental fish used were held in captivity ... -
Longterm studies on spawning in Arcto - Norwegian cod - mortality pattern of eggs and early larvae
Solemdal, Per; Makhotin, Valeri; Fonn, Merete (ICES CM documents, Working paper, 1998) -
Mechanisms regulating oocyte recruitment and skippedspawning in Northeast Arctic cod (Gadus morhua L.)
Skjæraasen, Jon Egil; Kennedy, James; Thorsen, Anders; Fonn, Merete; Strand, Bente; Mayer, Ian; Kjesbu, Olav Sigurd (Journal article; Peer reviewed, 2009-09)To examine mechanisms that affect fecundity, atresia and skipped spawning in Northeast Arctic cod (Gadus morhua L.), we conducted an experiment where wild-caught cod (>60 cm) kept under restricted food regimes were subjected ... -
Mechanisms regulating oocyte recruitment and skippedspawning in Northeast Arctic cod (Gadus morhua L.)
Skjæraasen, Jon Egil; Kennedy, James; Thorsen, Anders; Fonn, Merete; Strand, Bente; Mayer, Ian; Kjesbu, Olav Sigurd (Journal article; Peer reviewed, 2009-09)To examine mechanisms that affect fecundity, atresia and skipped spawning in Northeast Arctic cod (Gadus morhua L.), we conducted an experiment where wild-caught cod (>60 cm) kept under restricted food regimes were subjected ... -
PAH and biomarker measurements in fish from condition monitoring in Norwegian waters in 2005 and 2008
Grøsvik, Bjørn Einar; Meier, Sonnich; Liewenborg, Birgitta; Nesje, Guri; Westrheim, Kjell; Fonn, Merete; Kjesbu, Olav Sigurd; Skarphéðinsdóttir, Halldóra; Klungsøyr, Jarle (ICES CM documents;2010/F:06, Working paper, 2010) -
The potential importance of the paternal contribution to the ‘Stock Reproductive Potential’ of North-East Arctic cod (Gadus morhua)
Nash, Richard D.M.; Kjesbu, Olav Sigurd; Thorsen, Anders; Fonn, Merete; Krüger-Johnsen, Maria; Trippel, Ed (ICES CM documents, Working paper, 2005)Over the years there has been a growing interest in determining the real stock reproductive potential (SRP) as a means of understanding the dynamics of a fish population. For the purposes of assessment the spawning stock ... -
Reaction of sandeel to seismic shooting: a field experiment and fishery statistics study
Hassel, Arne; Knutsen, Tor; Dalen, John; Skaar, Kristian; Østensen, Øivind; Haugland, Eli Kyrkjebø; Fonn, Merete; Høines, Åge S.; Misund, Ole Arve (Fisken og havet, Research report, 2003)The reaction to seismics of lesser sandeel (Ammodytes marinus) was investigated in the North Sea using steel cages to enclose the fish while burried in the sand. Three cages were exposed to seismic shooting from SV "Falcon ... -
Skipped spawning in Northeast Arctic haddock Melanogrammus aeglefinus
Skjæraasen, Jon Egil; Korsbrekke, Knut; Nilsen, Trygve; Fonn, Merete; Kjesbu, Olav Sigurd; Dingsør, Gjert Endre; Nash, Richard David Marriott (Journal article; Peer reviewed, 2015-04-22) -
Stereological calibration of the profile method to quickly estimate atresia levels in fish
Kjesbu, Olav Sigurd; Fonn, Merete; Gonzáles, Barbara Dunia; Nilsen, Trygve (Journal article; Peer reviewed, 2010-05)The (physical) ‘disector method’, a frequently cited stereological technique, has so far received little attention within fish fecundity studies, although it can be used to provide unbiased, assumption-free data on levels ... -
Stereological calibration of the profile method to quickly estimate atresia levels in fish
Kjesbu, Olav Sigurd; Fonn, Merete; Gonzáles, Barbara Dunia; Nilsen, Trygve (Journal article; Peer reviewed, 2010-05)The (physical) ‘disector method’, a frequently cited stereological technique, has so far received little attention within fish fecundity studies, although it can be used to provide unbiased, assumption-free data on levels ... -
Thermal dynamics of ovarian maturation in Atlantic cod (Gadus Morhua)
Kjesbu, Olav Sigurd; Righton, David; Krüger-Johnsen, Maria; Thorsen, Anders; Michalsen, Kathrine; Fonn, Merete; Witthames, Peter R. (Journal article; Peer reviewed, 2010-03)The timing and success of spawning in marine fish are of fundamental importance to population persistence and distribution and, for commercial species, sustainability. Their physiological processes of reproduction are ... -
Timecourse of oocyte development in saithe Pollachius virens
Skjæraasen, Jon Egil; Devine, Jennifer Ann; Godiksen, Jane Aanestad; Fonn, Merete; Otterå, Håkon Magne; Kjesbu, Olav Sigurd; Norberg, Birgitta; Langangen, Øystein; Karlsen, Ørjan (Journal article; Peer reviewed, 2017)Wild caught North Sea saithe Pollachius virens were monitored for growth, sex steroid profiles and oocyte development pre-spawning and measured for egg size and group fecundity during the spawning season in the laboratory. ...