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  • 1990-1994  (5)
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  • 1
    Electronic Resource
    Electronic Resource
    Fast- and slow-growing pike, Esox lucius L., and problems of age-determinations from scales (1990)
    Oxford, UK : Blackwell Publishing Ltd
    Aquaculture research 21 (1990), S. 0 
    Details
    ISSN: 1365-2109
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract. River Frome pike, Esox lucius L., usually spawned in drainage channels connected to the main river. Most 0+ pike moved into the river during their first summer, but some remained in the channels until the following year. The latter group ate macro-invertebrates (chiefly Asellus), whereas their siblings in the main river were piscivorous. 0+ pike in the channels had slower growth rates than those in the river, but growth rates of the two groups in later years were similar. The presence of these initially slow-growing pike in the population caused problems in identifying the first annulus on the scales. The problem was identified by batch-marking 0+ fish in different years and examining scales from individuals that were subsequently recaptured. The interpretation of true annuli and false checks in older fish was aided by collecting sets of scales from individually tagged pike which were recaptured at intervals over a number of years. The study emphasized the importance of validating age determinations by obtaining information from more than one source.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2109.1990.tb00485.x
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Comparative growth and diet of tench Tinca tinca (L.) larvae and juveniles from river floodplain biotopes in France and England (1993)
    Oxford, UK : Blackwell Publishing Ltd
    Ecology of freshwater fish 2 (1993), S. 0 
    Details
    ISSN: 1600-0633
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: The growth and diet of larvae and 0 + juveniles of riverine tench Tinca tinca (L.) were compared in two stagnant floodplain biotopes from the upper River Rhône, France, and the River Great Ouse, England. The diet of tench was generally similar at the French and English sites, with Cladocera being the predominant prey of young larvae (English site only). Cladocera and Copepoda were the principal prey of older larvae and 0 + juveniles, though the latter took a variety of other, larger prey items. Ontogenetic changes in diet at both sites probably reflect prey availability. Protracted spawning at the French site contrasted a single spawning effort in the English backwater. Fluctuations in growth rate and condition were observed to coincide with shifts in diet, suggesting that tench developing in riverine biotopes may be vulnerable to competition at particular transitional intervals in their early ontogeny.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1600-0633.1993.tb00084.x
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Effects of impoundment on populations of bullhead Cottus gobio L. and minnow, Phoxinus phoxinus (L.), in the basin of Cow Green Reservoir (1991)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 38 (1991), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: The distribution, growth and reproduction of bullhead, Cottus gobio, L., and minnow, Phoxinus phoxinus (L.), were studied at Cow Green Reservoir, Upper Teesdale, for 10 years following impoundment in 1970. Comparisons were made with pre-impoundment results. The length-for-age of bullheads increased after impoundment. The length-for-age of minnows decreased. In winter both species were confined mainly to deep water or to the stone facing of the earth dam. In summer they were found throughout the reservoir though bullheads were scarce in the littoral zone. Female bullheads became sexually mature at an earlier age (84% at age-group I) than before impoundment (33% at age-group I) but no change was apparent amongst males (67–62% in age-group I). The post-impoundment sex ratio did not differ from 1:1 and individual fecundity did not change after impoundment. There was a significant reduction in individual fecundity of the minnow. The mean instantaneous rate of mortality (Z) for bullhead of age-groups II to IV was 0.96 ± 0.34 year−1, compared with 0.85 ± 0.29 year in the Tees before impoundment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1095-8649.1991.tb03161.x
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Production of juvenile Atlantic salmon,Salmo salar, in natural waters (1994)
    Springer
    Reviews in fish biology and fisheries 4 (1994), S. 262-263 
    Details
    ISSN: 1573-5184
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00044134
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    The biology of the eel Anguilla anguilla (L.) in an English chalk stream and interactions with juvenile trout Salmo trutta L. and salmon Salmo salar L. (1991)
    Springer
    Hydrobiologia 218 (1991), S. 65-76 
    Details
    ISSN: 1573-5117
    Keywords: eels ; salmonidae ; competition ; chalk streams
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The age, growth, annual production and diet of the eel Anguilla anguilla were examined in a chalk stream in southern England. Growth in length fitted the von Bertalanffy model: L t = 708(1 − exp( − 0.064(t + 0.625))), where L t is the mean length (mm) at age t years. Annual length increments over the first 10 years averaged 31 mm, and annual production was 3.43 g m−2 y−1 (range 3.13–3.75). This fell to 2.09 (1.75–2.34) over two years as result of successive eel culls. Comparisons of eel diets with those of juvenile salmon Salmo salar and trout S. trutta showed that eels preyed more on benthic invertebrates, whereas the salmonids took more mid-water and surface prey. Piscivory was most marked in eels 〉400 mm, but few salmonids were eaten; most fish prey were the sculpin Cottus gobio. Attempts to reduce the eel population by successive eel culls were only partly successful because of the upstream immigration of elvers and downstream migration of silver eels into the study area. We conclude that, in this salmonid nursery stream, eels do not have a measurable effect on the salmonid population through predation or by utilizing the same food source.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00006419
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    Paper (German National Licenses)
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