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  • 1
    Electronic Resource
    Electronic Resource
    The effects of thermal effluent exposure on the gametogenesis of female fish (2000)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 56 (2000), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: High temperature in Swedish and Lithuanian thermal effluent areas influenced gametogenesis of female perch Perca fluviatilis, roach Rutilus rutilus and pike Esox lucius negatively, indicating reduced reproductive capacity. Oocyte atresia started during vitellogenesis in autumn, and was often followed by asynchronous egg cell development. Among other anomalies, multi-nucleus oocytes and hermaphroditism were observed. No significant impact was seen in silver bream Blicca bjoerkna. Ruffe Gymnocephalus cernuus reacted by a tendency to produce an additional mature oocyte generation during the spawning period. Ovaries in roach from coastal areas were often infected by a microsporidian parasite Pleistophora mirandellae, causing severe damage to the gonad. Parasites were also detected in pike, but neither in perch nor in lake populations of roach. Fish living in open coastal environments did not avoid impact by moving out of the heated areas. There seems to be a conflict in some temperate fish between temperature preference behaviour and safeguarding normal reproduction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1095-8649.2000.tb02085.x
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  • 2
    Electronic Resource
    Electronic Resource
    Temperature effects on spawning and egg development in Eurasian perch (1997)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 51 (1997), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Spawning, egg strand development and embryo survival was studied during 1995–1996 in perch Perca fluviatilis exposed to heated effluent from two coastal nuclear power plants on the Baltic. Spawning was earlier and more prolonged in the heated areas. Although the fertilization rate was high, most egg strands sampled in the heated areas did not develop to hatching. The egg strands disintegrated within a few days of spawning, and egg mortality was very high. All samples collected from reference areas developed up to hatching. Exposure to high temperatures during the final maturation of the gonad influenced the follicular mechanism producing the jelly membrane which constitutes the matrix of the egg strand. Effects were observed in fish in open effluent areas as well as in an enclosed research basin. These results suggest that there is a conflict between optimal reproduction and temperature preference in temperate area fish. Fish are attracted to cooling water effluent, at the expense of reduced reproductive performance.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1095-8649.1997.tb01540.x
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  • 3
    Electronic Resource
    Electronic Resource
    Elver (Anguilla anguilla L.) stockings in a Swedish thermal effluent-recaptures, growth and body condition (1991)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of applied ichthyology 7 (1991), S. 0 
    Details
    ISSN: 1439-0426
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Stockings of elvers (Anguilla anguilla L.) were made in 1982 and 1984 in a Swedish cooling water effluent area at the coast of the Baltic proper. The elvers were tagged using radioactive europium isotopes; recaptures were made by yearly samplings from 1983–1989. Détéction of eels tagged by this technique was found to be possible for at least 7 years after stocking. At the end of the study, 3.5 % and 1.3 %, respectively, of the stockings were recaptured in our own sampling programme. Growth of the introduced eels was faster than reported in studies on comparable populations. As high temperatures have a potential to change vital physiological functions, body condition, fat content and size distribution were studied in the stocking area, in two additional cooling water effluents, and in two reference areas along a salinity gradient from the Baltic to the northern Kattegat! where Atlantic waters have a major influence. Although there were indications of early sexual maturation in warm waters, the high survival of introduced eels, their tendency to stay in the stocking area, the fast growth and the positive effect on quality paramétérs such as fat content speaks in favour of an allocation of eel management to thermal discharge areas.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1439-0426.1991.tb00513.x
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  • 4
    Electronic Resource
    Electronic Resource
    Prevalence and abundance of Anguillicola crassus in the European eel (Anguilla anguilla) at a thermal discharge site on the Swedish coast (1993)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of applied ichthyology 9 (1993), S. 0 
    Details
    ISSN: 1439-0426
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: The accidental introduction and establishment of a population of the sanuivorous swimbladder nematode, Anguillicola crassus, in eels in an area of the Baltic Sea off the coast of Sweden that is affected by thermal water discharge was studied bi-annually over a 5-year period. In 1987, none of 387 eels examined was found to be affected. The first case of infection was recorded in 1988 and within 3 years the prevalence of infection had increased to about 60 %. By 1991, this was the most heavily infested area in Swedish waters. Whereas for yellow eels in the surrounding archipelago records have been kept only sporadicall since the infestation became established, in 1989–91 it was observed that both the prevalence and the abundance of infection were significantly higher in spring than during the second half of the year. When the frequency distributions of parasites for this period 1989–91 are compared, it is evident that this seasonality is connected with an autumn increase in the proportion of eels free from infestation, rather than a reduced proportion of those heavily infected. Furthermore, no seasonality was noted in the proportion of developmental stages of the parasite. Consequently, the observed seasonality is suggested mainly to be an effect of immigrating heathy eels.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1439-0426.1993.tb00533.x
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  • 5
    Electronic Resource
    Electronic Resource
    Haematological responses in the European eel, Anguilla anguilla L., to sublethal infestation by Anguillicola crassus in a thermal effluent of the Swedish Baltic (1992)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish diseases 15 (1992), S. 0 
    Details
    ISSN: 1365-2761
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Medicine
    Notes: Abstract. Haematological variations were studied in a European eel population, Anguilla anguilla L., naturally infested by the sanguivorous nematode Anguillicola crassus. This occurred off the Swedish Baltic coast in an area receiving heated cooling water from a nuclear power station. The erythrocyte count, haematocrit, leucocrit, haemoglobin concentration, mean corpuscular volume, mean corpuscular haemoglobin and mean corpuscular haemoglobin concentrations, the various cell types in peripheral blood, serum iron concentration, the amount of total serum protein, and scrum protein fractions α1, β1, α2, β2 and γ were all measured. Each variable was correlated to: (1) the intensity of infestation, i.e. number of parasites per host; and (2) a parasitization index, i.e. the weight of parasites per somatic weight of the host. Most variables showed no or only minor reactions to the infestation. However, a marked increase in the γ-fraction of scrum proteins, reduced lymphocyte numbers and increased granulocyte numbers are indicative of a humoral and cellular immune response.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2761.1992.tb00682.x
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