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Social stress induces structural and functional alterations of phagocytes in rainbow trout (Oncorhynchus mykiss)
Peters, G.; Nüβgen, A.; Raabe, A.; Möck, A. (1991). Social stress induces structural and functional alterations of phagocytes in rainbow trout (Oncorhynchus mykiss). Fish Shellfish Immunol. 1(1): 17-31
In: Fish & Shellfish Immunology. Academic Press: London; New York. ISSN 1050-4648, more
Peer reviewed article  

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Keywords
    Biological stress; Fish physiology; Haematology; Immunology; Induction; Leukocytes; Phagocytosis; Serological studies; Stress; Temporal variations; Ultrastructure; Marine; Fresh water

Authors  Top 
  • Peters, G.
  • Nüβgen, A.
  • Raabe, A.
  • Möck, A.

Abstract
    Stress induced by social conflict in rainbow trout is known to result in physiological and haematological alterations as well as immune suppression. Based on these findings the authors sought to determine whether structure and function of the phagocytes in subordinate fish (Oncorhynchus mykiss) respond to the stressful situation. Phagocytes are essentially involved in the immune defence of teleosts. Histological and ultrastructural studies of haemopoietic pronephros tissue have shown that under stress, potential phagocytes (histiocytes, reticulum cells, endothelial cells, and neutrophils) become activated. They show marked hypertrophy, increased pseudopod formation and enhanced autophagocytosis. Erythrophagocytosis is particularly conspicuous suggesting some impairment of the red blood cell vitality. In vivo and in vitro tests using yeast cells also indicate an average increase in the phagocytosis rate in the subordinate fish. However, a considerable percentage of the phagocytes show signs of degeneration. They disintegrate, thereby forming necrotic tissue areas.

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