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The ultrastructure of fish-skin during stress in aquaculture
Iger, Y.; Hilge, V.; Abraham, M. (1992). The ultrastructure of fish-skin during stress in aquaculture, in: Progress in aquaculture research: proceedings of the 4th German-Isreali Status Seminar held on October 30-31, 1990. Spec. Publ. Eur. Aquacult. Soc, 17: pp. 205-214
In: Spec. Publ. Eur. Aquacult. Soc, more

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Keyword
    Marine

Authors  Top 
  • Iger, Y.
  • Hilge, V.
  • Abraham, M.

Abstract
    The effects of stress and hormonal treatment on the skin of fish were investigated in Cyprinus carpio and Silurus glanis. Stress caused by environmental and social factors, as well as prolactin and ACTH treatment, affected the ultrastructure of the skin. Secretions of mucous- and pavement-cells provided protection to the fish epidermis during stress. These cells displayed intense synthetic activity and a high turnover rate. Both cell types contained high amounts of freshly synthesized alkaline phosphatase, a protective enzyme which probably acts on the skin surface as an antibacterial agent. Filament cells lost their interconnection allowing an increased cellular migration. In the dermis, stress was characterized by angiogenesis, the formation of slits in the basement lamina at the dermis/epidermis boundary and the extravasation of leucocytes which pervaded the epidermis. ACTH, as well as prolactin, elicited increased cellular turnover with high mitotic and apoptotic rates. Prolactin stimulated mucogenesis, while ACTH influenced mainly the synthesis of glycocalyx and alkaline phosphatase.

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