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  • 1990-1994  (5)
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Material
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Year
  • 1
    Electronic Resource
    Electronic Resource
    Do small riverine fish move inshore at night? (1993)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 43 (1993), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: We tested the hypothesis that numbers of small fish increase along river banks with decreasing light levels. Fish were sampled every 3h over a 24-h period (30–31 August 1992) along two adjacent stretches of bank (one shallow sand, one steep boulder) on the R. Morava near Breelav, Czech Republic. The size of fish was significantly greater along the boulder bank than along the sand bank. Numbers of fish along the steep boulder bank did not increase with decreasing light levels, except in Rhodeus sericeus and perch Perca fluviatilis, which were significantly more abundant at night. Along the shallow sand bank, all species increased in number at night, most significantly so. As light levels decreased, numbers of whitefin gudgeon Gobio albipinnatus and roach Rutilus rutilus decreased along the boulder bank, as their numbers increased along the sand bank, suggesting a dusk migration to the sand bank to avoid predation. This assumption was corroborated by the significantly higher number of potentially piscivorous fishes (P. ftuviatilis and chub Leuciscus cephalus≥ 80 mm) along the boulder bank during the night.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1095-8649.1993.tb01190.x
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    First occurrence of the North American white sucker Catostomus commersoni in Great Britain (1993)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 42 (1993), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: The first specimen of white sucker Catostomus commersoni encountered in Great Britain is reported: a female of 320 mm s.l., 710 g wet body weight, estimated age of 3 +, and ripe with eggs (≃21% of the body weight). Isoelectric focusing of a tissue sampSe was also undertaken.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1095-8649.1993.tb00367.x
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Recognition of cohorts and growth of larval and juvenile roach Rutilus rutilus (L.), using size-class ordination of developmental steps (1990)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 36 (1990), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Roach larvae and 0+ juveniles were sampled weekly in three different floodplain channels (stagnant, semi-lotic, lotic) of the Upper Rhône River, France, from spring to autumn 1985 using Point Abundance Sampling by electrofishing. Length-frequency analysis by size-class ordination of developmental steps successfully distinguished both overlapping and non-overlapping histograms within the data matrix and revealed the temporal and spatial segregation of a number of cohorts, individuals born at a common site on the same day, which in some cases presented significant differences in standard length within a given developmental step. Despite these initial differences, the various cohorts converged to form one relatively homogeneous cohort around the moment of transition to the juvenile period. Significant differences in standard length were found between populations in the open lotic channel (relatively cooler) and those in the closed, stagnant (relatively warmer) former channel, suggesting that fish growth in isolated ecosystems is influenced by higher or periodically elevated temperatures and by greater levels of resource competition and predation. A similar pattern of differences in length was also observed in 0+ juvenile roach collected from 18 other floodplain channels of the Upper Rhône.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1095-8649.1990.tb05629.x
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Shifts in the microhabitat of larval and juvenile roach, Rutilus rutilus (L.), in a floodplain channel (1990)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 36 (1990), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: The microhabitat of roach larvae (stages L1–L6) and 0+ juveniles was examined in a braided channel (Ilon) of the Upper Rhone River, France, from weekly samples (spring-autumn 1985) using Point Abundance Sampling by electrofishing. During early development, microhabitat exploitation was characterized by two transitions: the first at larval step L3, when morphological and physiological attributes permit the active choice of microhabitat; the second at the end of the larval and start of the juvenile period. At larval step L3, and up to L5, roach were strongly associated with lentic waters of medium depth (0.5–1.0m) and with either macrophytes or ligneous debris. The L6 and 0+ juveniles were found more often than expected in shallower waters (〈 0.2m, 0.2–0.5 m) and were no longer associated with dense vegetation or ligneous debris. However, both larval (L3–L6) and 0+ juvenile roach preferred silty sand and/or silted gravel, and a lack of current. This shift, from moderately deep waters with vegetation and/or branches as larvae to open shallow waters as juveniles, demonstrates the young roach's perception and response to environmental change, with shallows exploited as a refuge from predation when protective structures become scarce or unavailable.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1095-8649.1990.tb04322.x
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    Paper (German National Licenses)
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  • 5
    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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