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  • 1
    Electronic Resource
    Electronic Resource
    Effects of steroid hormones on immunoglobulin M (IgM) in rainbow trout, Oncorhynchus mykiss (1999)
    Springer
    Fish physiology and biochemistry 20 (1999), S. 155-162 
    Details
    ISSN: 1573-5168
    Keywords: cortisol ; estradiol-17β ; 11-ketotestosterone ; mucus ; plasma ; testosterone
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The immunosuppressive effects of steroid hormones were evaluated as the response against implanted steroid hormones, cortisol (F), testosterone (T), estradiol-17β (E2), and 11- ketotestosterone (11-KT), in juvenile rainbow trout. In long term experiments (5 weeks), fish were given a single intraperitoneal implant of F or T. A clear suppressive effect of plasma IgM levels with F and T was not necessarily obtained, although mucus IgM levels were reduced corresponding to the elevated plasma steroid hormone levels. In short term experiments (1 week), intraperitoneal implantation of T, 11-KT and E2 suppressed plasma and mucus IgM levels, although the effects were not dose-dependent. When administered through diet, F and T caused a suppression of plasma IgM levels; F administration at both high and low dosages caused a significant decrease in plasma IgM levels, while only a high dose of T caused the suppression. These results suggest that sex steroid hormones, as well as F, have immunosuppressive functions in rainbow trout.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1007799617597
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Reproduction related immunoglobulin changes in rainbow trout (1997)
    Springer
    Fish physiology and biochemistry 17 (1997), S. 415-421 
    Details
    ISSN: 1573-5168
    Keywords: fish ; trout ; reproduction ; seasonal changes ; immunoglobulin ; testosterone ; estradiol-17β ; 11-ketotestosterone ; water temperature
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Annual changes in plasma immunoglobulin (IgM) levels were investigated in three strains of rainbow trout Oncorhynchus mykiss which have different spawning periods, i.e., September–October, November–December, and January, reared under constant water temperature and natural day length. Plasma IgM levels decreased during the spawning season in all strains tested. The IgM changes became reversed in response to significant increases in plasma testosterone (T) and estradiol-17β in females and T and 11-ketotestosterone in males. Though the IgM decline showed a connection with suppressed immunocompetence, since many mature fish caught fungal diseases, no clear differences were observed in the plasma IgM levels between infected and noninfected fish during the spawning season. Incidentally, plasma IgM levels in infection prone fish were higher than in noninfection prone fish prior to the spawning season, whereas coincident differences in the plasma steroid levels were observed. Immature fish reared under lower water temperatures showed lower IgM levels. The effect of water temperature may have to be considered when analyzing the defense mechanism during the spawning season in rainbow trout.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1007795827112
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
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