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  • 1
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 38 (1991), S. 0 
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Karyotypic analysis of plaice, Pleuronectes platessa L., and cod, Gadus morhua L., revealed that the chromosome numbers in both species vary but that chromosome arm numbers (NF) stay constant. The C-, Q- and R-banding patterns also confirmed that the population of plaice studied shows Robertsonian polymorphism. The tendency of reduction in chromosome number in fishes suggests that Robertsonian fusions play a role in karyotype evolution in fishes.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 37 (1990), S. 0 
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: A new method for the preparation of fish chromosomes from abdominal cavity fluid has been developed. Cells were collected from fish abdominal cavity fluid after an in vivo PHA treatment, and cultured for a short time in medium with colchicine. After 30 min hypotonic treatment for marine fish and 35 min for freshwater fish, slides were prepared by the conventional air-drying method. The advantages ofthe method are: (1) it is technically simple; (2) it produces a reasonably high mitotic index; (3) chromosome spreading is good (4) there is very little cell breakage. Using this method, the chromosomes ofrainbow trout (2n=62); cod (2n=4546) and plaice (2n=46,47 and 48) were investigated.
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  • 3
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 28 (1986), S. 0 
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Feulgen-stained blood smears taken from deformed alevins in a heat-shocked Atlantic salmon population were analyzed by microdensitometry. Within individual alevins, variable proportions of erythrocytes of differing DNA contents were seen. In a frequency distribution of these cells, peaks of DNA content were observed whose means appeared to increase in an arithmetic series. It is suggested that this, together with the complex nuclear morphology of the higher members of the series, is most likely to have arisen as a consequence of cell fusion processes involving, originally, haploid cells. During the 5-week period of yolk sac absorption there was an apparent selection against erythrocytes having higher DNA contents.
    Type of Medium: Electronic Resource
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