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  • 1990-1994  (3)
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  • 1
    Electronic Resource
    Electronic Resource
    The histopathology associated with the pre-adult and adult stages of Lepeophtheirus salmonis on the Atlantic salmon, Salmo salar L. (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. Atlantic salmon, Salmo salar L., infected with the pre-adult and adult stages of Lepeophtheirus salmonis were obtained from sea loch cage sites on the west coast of Scotland, and infection experiments were carried out in the laboratory. The motile parasites were retained at the point of attachment by prefixation with cooled alcohol. They were studied using light and scanning electron microscopy. Lepeophtheirus salmonis were found to leave an oval‘imprint’ corresponding to the margin of the parasite cephalothorax on the host skin and/or to wedge under its scales. General pathological changes including oedema, hyperplasia, sloughing of cells and cellular inflammation were observed in the host at and around the point of feeding and attachment. In gross lesions, serious damage occurred to the host epidermis with scale loss and haemorrhage a common feature. The most obvious changes were associated with the louse mouthtube, marginal membrane, second antenna, maxilliped and sternal furca.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2761.1992.tb00684.x
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    The histopathology associated with the juvenile stages of Lepeophtheirus salmonis on the Atlantic salmon, Salmo salar L. (1990)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish diseases 13 (1990), S. 0 
    Details
    ISSN: 1365-2761
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Medicine
    Notes: Abstract. Atlantic salmon infected with juvenile stages of Lepeophtheirus salmonis were obtained from sea loch cage sites on the West coast of Scotland. Attached parasites on the skin were studied using light and electron microscopy. Behavioural activity was observed in attached stages maintained on skin in vitro. Pathological changes were associated with four main areas of interaction between the parasite and the host, namely second antennal attachment, filament attachment, maxilliped activity and feeding activity. The skin changes involved were initial mechanical disruption followed by epidermal hyperplasia. The filament material was secreted into the epidermis and spread laterally without breaching the basement membrane. Surprisingly little reaction to the filament occurred, but chalimus activity resulted in chronic changes which were more marked as the later chalimus stages were reached. Fibroplasia was a feature of lesions induced by redundant filaments resulting in small nodular lesions. After erosion of these nodules, all that remained were the melanized rings characteristic of old chalimus sites.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2761.1990.tb00786.x
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Fallowing of marine Atlantic salmon, Salmo salar L., farms as a method for the control of sea lice, Lepeophtheirus salmonis (Kroyer, 1837) (1993)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish diseases 16 (1993), S. 0 
    Details
    ISSN: 1365-2761
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Medicine
    Notes: Abstract. Infections of Lepeophtheirus salmonis (Krøyer, 1837) and Caligus elongates Nordmann, 1832 were monitored over a 20-month period on four marine Atlantic salmon, Salmo salar L., farms in Scotland. Three farms were fallowed between harvesting and restocking, and thus, contained only one year class of fish at a time. The fourth site was not fallowed and contained two year classes of fish. Results show that fallowing led to low numbers of L. salmonis on newly introduced fish for several months after stocking, with much less need to use chemotherapy. New fish in the non-fallowed site became very rapidly infected with L. salmonis and required chemotherapy within 2 months of stocking. Fallowing did not appear to be effective in restricting the abundance of C. elongatus. Longer periods of fallowing were more effective in controlling lice numbers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2761.1993.tb00882.x
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