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  • 1985-1989  (3)
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Materialart
Erscheinungszeitraum
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  • 1
    Digitale Medien
    Digitale Medien
    Genetic differentiation between freshwater resident and anadromous brown trout, Salmo trutta, within watercourses (1989)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 34 (1989), S. 0 
    Details
    ISSN: 1095-8649
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Biologie
    Notizen: Freshwater resident and anadromous life history forms of brown trout, Salmo trutta L., sampled from each of three watercourses were analysed for biochemical genetic variation. Ten enzyme systems encoded by a putative 30 loci were analysed. Significant genetic differences were found between the two life history forms in all three watercourses. Further, significant genetic differences were also found between the three anadromous populations analysed, although two of them are separated by a distance along the shore line by less than 2 km. The findings focus on the need to reconsider the conservation and management practice of wild and hatchery-reared stocks.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1095-8649.1989.tb03338.x
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    The influence of three unchanging photoperiods on growth and parr-smolt transformation in Atlantic salmon, Salmo salar L. (1989)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 35 (1989), S. 0 
    Details
    ISSN: 1095-8649
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Biologie
    Notizen: Groups of pre-smolt Atlantic salmon were reared under three experimental photoperiods. Growth rate was significantly enhanced under 24 h of light: 0 h of darkness per diem (24 L: 0 D) compared with 16 L: 8 D and 8 L: 16 D from early January to early May. From the beginning of May until the termination of the experiment on 27 May, growth rate was highest under 8 L: 16 D.All groups developed bimodal length-frequency distributions during the experiment. The proportion of the population in each of the two growth modes was significantly affected by photoperiod treatment.The level of plasma cortisol increased significantly from February to May. There were no differences in levels of plasma cortisol among photoperiod treatments.Judged by development in plasma cortisol, changes in condition factor and external appearance, the parr-smolt transformation was not completed under any of the experimental photoperiods.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1095-8649.1989.tb02973.x
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    Genetic variation and population structure of cod, Gadus morhua L., in some fjords in northern Norway (1989)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 35 (1989), S. 0 
    Details
    ISSN: 1095-8649
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Biologie
    Notizen: Biochemical genetic polymorphism in cod from several fjords in Troms, northern Norway was analysed. Gene frequencies at several polymorphic loci (Hb, Pgi, Ldh, Pgm, Gpd and Idh) are given. Significant variation was found both within and between fjords, and even between samples from the same locality sampled in different years, indicating a mosaic structure of the cod population in the area studied. The results of the haemoglobin variation are compared to similar results obtained more than 20 years ago in the same and adjacent areas. The biochemical genetic variation is discussed in relation to stability of gene frequencies, isolation mechanisms and migration patterns.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1095-8649.1989.tb03067.x
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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