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  • 1
    Digitale Medien
    Digitale Medien
    Survey methodology for fish population assessment within Anglian water (1985)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 27 (1985), S. 0 
    Details
    ISSN: 1095-8649
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Biologie
    Notizen: Basic data required for the maintenance, improvement and development of inland fisheries within the Anglian Water Authority area are derived from surveys carried out since 1977. All open river systems are sampled on a 3-year cycle and basic data are obtained on species composition, density and biomass as well as year-class structure and growth rates of dominant species.The netting and electrofishing gear and techniques used to obtain quantitative and semi-quantitative samples from rivers, drainage channels and the Norfolk Broads are described and their advantages and disadvantages discussed. The mark and recapture and multiple removal techniques employed with these methods are described and an assessment given of sampling efficiency in different situations.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1095-8649.1985.tb03240.x
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Sampling strategy related to fish distribution, with particular reference to the Norfolk Broads (1985)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 27 (1985), S. 0 
    Details
    ISSN: 1095-8649
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Biologie
    Notizen: Large-scale movements of fish within a complex freshwater system such as the Norfolk Broads can give rise to erroneous sampling data if the extent of these movements is not fully appreciated. The Norfolk Broads habitat is briefly described, and data are presented showing that mean estimates of standing crop in the broads vary from 〈1gm-2 in the winter to 9.4 gm-2 in the summer. The widespread nature of the phenomenon is demonstrated by winter and summer data from five broads, and a more detailed picture of the seasonal changes is shown by an intensive 2-year study on one of these broads. Winter aggregations of fish have been found in sites adjacent to rivers connected with the broads, with densities of up to 36.7 fish m-2 and a biomass of 1787 gm-2. Accurate overall estimates of fish standing crop can only be obtained when fish are maximally dispersed during the summer months.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1095-8649.1985.tb03239.x
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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    Artikel (Nationallizenzen)
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