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  • 1985-1989
  • 1980-1984  (2)
  • 1980  (2)
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Material
Years
  • 1985-1989
  • 1980-1984  (2)
Year
  • 1
    Electronic Resource
    Electronic Resource
    The Collection, Identification and Reconstruction of Lengths of Fish Prey from their Remains in Pike Stomachs (1980)
    Oxford, UK : Blackwell Publishing Ltd
    Aquaculture research 11 (1980), S. 0 
    Details
    ISSN: 1365-2109
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: A simplified Seaburg sampler was used to obtain stomach contents from anaesthetized pike. Well-digested remains of fish prey were identified from pharyngeal bones (Cyprinidae) or the skeletal structure of the caudal region, by comparison with type material collected from fresh fish. The original lengths of the prey were estimated from linear relationships between fish length and size of the caudal fin, or size of the pharyngeal bone. Estimation of prey size from scales or otoliths using length-for-age data gave only approximate values.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2109.1980.tb00402.x
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    The growth and reproductive strategy of the gudgeon, Gobio gobio (L.), in two hard-water rivers in southern England (1980)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 17 (1980), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Scales from 682 gudgeon from the River Frome and 504 from the River Stour were used for age determinations. Growth in length was confined to the period May to October, but some weight increase occurred during the winter because of gonad development. Growth rates in the two rivers were the same, and were higher than most of those reported from other European rivers. Wide fluctuations, up to 12-fold, occurred in the year-class strengths of Frome gudgeon, caused by variations in the survival of juvenile gudgeon in their first year of life. Density-independent factors, particularly water temperature, were major influences. Female gudgeon grew marginally slower than the males, but they matured earlier and at a smaller size. They were fractional spawners but their total reproductive effort each season was high. Both sexes had low survival rates and their reproductive life spans were rarely more than three years. These life history traits support the premise that these gudgeon populations are r-selected.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1095-8649.1980.tb02750.x
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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