Blar i Brage IMR på forfatter "Witthames, Peter R."
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The application of tank experiments to the study of reproductive potential in teleosts using Gadus morhua as a test model
Witthames, Peter R.; Andersen, T.E.; Kjesbu, Olav Sigurd (ICES CM documents, Working paper, 2000)Age-based population assessments (VPA) have often failed to show a clear relationship between spawning stock biomass and either recruitment or biomass estimated from annual egg production. Recent work has shown that the ... -
The concept of fecundity regulation in plaice (Pleuronectes platessa) tested on three Irish Sea spawning populations
Kennedy, James; Witthames, Peter R.; Nash, Richard D.M. (Journal article; Peer reviewed, 2007)The fecundity of European plaice (Pleuronectes platessa) in the Irish Sea between 2000 and 2004 was estimated during the spawning season for fish in the three main spawning areas (Liverpool Bay, the Cumbrian coast, and the ... -
Estimation of potential and realised fecundity of fish
Thorsen, Anders; Kjesbu, Olav Sigurd; Witthames, Peter R. (ICES CM documents, Working paper, 2005) -
The fate of vitellogenic follicles in experimentally monitored Atlantic cod Gadus morhua (L.): Application to stock assessment
Witthames, Peter R.; Thorsen, Anders; Kjesbu, Olav Sigurd (Journal article; Peer reviewed, 2010-05)In this paper we report on the fate of vitellogenic follicles (VF) as either alpha atretic follicles (αF) or post-ovulatory follicles (POFs) using histology and captive Atlantic cod (Gadus morhua) in three experiments. In ... -
The fate of vitellogenic follicles in experimentally monitored Atlantic cod Gadus morhua (L.): Application to stock assessment
Witthames, Peter R.; Thorsen, Anders; Kjesbu, Olav Sigurd (Journal article; Peer reviewed, 2010-05)In this paper we report on the fate of vitellogenic follicles (VF) as either alpha atretic follicles (αF) or post-ovulatory follicles (POFs) using histology and captive Atlantic cod (Gadus morhua) in three experiments. In ... -
Fecundity and growth of Atlantic cod (Gadus morhua L.) along a latitudinal gradient
Thorsen, Anders; Witthames, Peter R.; Marteinsdottir, Gudrun; Nash, Richard D.M.; Kjesbu, Olav Sigurd (Journal article; Peer reviewed, 2010-05)Some fish species have wide distribution areas that span very different habitats. In this investigation we have studied Atlantic cod (Gadus morhua), which is an example of such a species, to demonstrate how this may have ... -
Report of the working group on modern approaches to assess maturity and fecundity of warm- and coldwater fish and squids
Kjesbu, Olav Sigurd; Hunter, John R.; Witthames, Peter R. (Fisken og havet, Research report, 2003)A workshop was held in Bergen in September 2001 to improve the overall quality of reproduction data used in assessments of marine stocks and egg production surveys by reviewing 1) present practices and 2) establishing a ... -
Temporal and spatial variation in fecundity of Irish Sea plaice
Kennedy, James; Witthames, Peter R.; Nash, Richard D.M. (ICES CM documents, Working paper, 2005) -
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 ...