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  • 1
    Electronic Resource
    Electronic Resource
    Relationships between phytoplankton and fish yields in Lake Balaton (1982)
    Springer
    Hydrobiologia 97 (1982), S. 3-7 
    Details
    ISSN: 1573-5117
    Keywords: phytoplankton biomass ; chlorophyll a ; fish yield ; Lake Balaton
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Coefficients of determination between fish yields in Lake Balaton (kg/ ha) and different measurements of phytoplankton abundance were: phytoplankton biomass (0.48), chlorophyll a (0.45). The same indices for catch per unit of effort (CUE) proved to be 0.82 and 0.88, respectively. The correlation between fish yields and phytoplankton density has been described in second-degree polynomials.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00014954
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  • 2
    Electronic Resource
    Electronic Resource
    The food of bream (Abramis brama L.) in two basins of Lake Balaton of different trophic status (1991)
    Springer
    Hydrobiologia 209 (1991), S. 51-58 
    Details
    ISSN: 1573-5117
    Keywords: food composition ; food selectivity ; bream ; Lake Balaton
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Contrary to earlier observations the food composition of bream (Abramis brama L.) in Lake Balaton has changed in parallel with eutrophication. These changes were probably caused by increased population density and connected with density dependent growth as well as sharpened inter- and intraspecific competition in the cyprinid community. According to the frequency of occurrence, zooplankton followed by benthic invertebrates comprised the majority of the bream's food. By weight, however, benthic food dominated in both basins. Size-related dietary changes were pronounced, but statistically not always significant, suggesting the overall importance of the most abundant and available prey types. Bream did not strongly select any of the zooplankton groups, however, seasonal changes in food composition alternated in parallel with the trophic gradient along the longitudinal axis of the lake.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00006717
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  • 3
    Electronic Resource
    Electronic Resource
    Biomass of planktonic crustaceans and the food of young cyprinids in the littoral zone of Lake Balaton (1995)
    Springer
    Hydrobiologia 303 (1995), S. 39-48 
    Details
    ISSN: 1573-5117
    Keywords: Lake Balaton ; littoral zone ; crustaceans ; feeding ; cyprinids
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The littoral zone of Lake Balaton and its periphyton-zooplankton-fish communities have been investigated intensively in recent years. Total average number of crustacean plankton varied from 36 to 126 ind l−1, their biomass from 0.49 to 1.86 mg ww l−1 month−1 at different areas of the littoral zone. In general, these values for the above parameters were higher in hypertrophic areas. 23 fish species occurred in the littoral zone with cyprinids dominating. The seasonal food spectra of Y-O-Y roach (Rutilus rutilus), white bream (Blicca bjoerkna) and bream (Abramis brema) were based mainly on planktonic crustaceans and benthic/periphytic invertebrates. According to the frequency of occurrence of crustaceans and other invertebrates, the food composition of young cyprinids differed significantly in the NE and SW-basins of the lake.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00034042
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  • 4
    Electronic Resource
    Electronic Resource
    Trophic relationships between primary producers and fish yields in Lake Balaton (1990)
    Springer
    Hydrobiologia 191 (1990), S. 213-221 
    Details
    ISSN: 1573-5117
    Keywords: chlorophyll a ; morphometry ; fish yields ; energy transfer ; Lake Balaton
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Relationships between chlorophyll a content of the water, the shoreline-length: water area ratio and the annual total fish yield as catch per unit effort (CUE: kg ha−1 100 h−1 as annual mean values) have been calculated by multivariable regression. The determination coefficient (r 2 = 0.913) showed a significant dependence of fish yield on morphometry of different lake areas. Accordingly, fish carrying capacity of the open water areas, calculated from chlorophyll a content and S/A, ranged from 12 to 34%, but that of the littoral zone between 66 and 88%. These findings have also been supported by echo-sounding records of the horizontal distribution of fish. Bream (Abramis brama L.) contributes the majority (70–80%) of fish stock and yield. Its food mainly consists of zooplankton and benthic invertebrates in ratios that are widely variable with season and depend on the age of fish. Average daily food consumption of individuals (age group 3 + and over) varies between 2 and 5 g. Bream consumes two- to three-times more food in the SW basin than in the NE one. This means that the present stocks inhabiting areas from NE to SW consume annually 13249–20085 t yr−1 of food. According to estimated calorific values, the annual energy consumption of local populations along the longitudinal axis of the lake varies between 93 and 141 kJ m−2 yr−1. The efficiency of energy transfer from primary producers to fish is low and varies from 0.04 to 0.1%.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00026054
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