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  • teleost  (2)
  • 1
    Electronic Resource
    Electronic Resource
    The GnRH systems in the brain and pituitary of normal and hCG treated European silver eels (1989)
    Springer
    Fish physiology and biochemistry 6 (1989), S. 279-284 
    Details
    ISSN: 1573-5168
    Keywords: GnRH immunohistochemistry ; pituitary ; puberty ; European eel ; teleost
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The distribution of immunoreactive GnRH was studied in the brain and pituitary gland of normal and human chorionic gonadotrophin (hCG) injected silver eels. It was found that the general organization of GnRH systems in this species is similar to that reported in other teleosts. Cell bodies were present in the olfactory bulbs, ventral telencephalon, periventricular hypothalamus and dorsal tegmentum. No positive perikarya could be detected in the preoptic region. Only scarce fibers were observed in the proximal neurohypophysis. Treatment with hCG does not modify the distribution of GnRH but it increases the density of positive structures, in particular at the level of the pituitary. The results are discussed in relation with the present status of knowledge of the mechanisms underlying the blockage of sexual maturation in the European eel at the silver stage.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01881681
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  • 2
    Electronic Resource
    Electronic Resource
    Effects of (D-Ala6, Pro9N ethylamide) — LHRH on plasma levels of gonadotropin, 17α,20β-dihydroxy-4-pregnen-3-one and testosterone in male goldeye (hiodon alosoides Rafineque) (1986)
    Springer
    Fish physiology and biochemistry 1 (1986), S. 163-170 
    Details
    ISSN: 1573-5168
    Keywords: teleost ; LHRHA ; gonadotropin ; sex steroids
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Male goldeye were treated with (D-Ala6, Pro9-N ethylamide) — LHRH (LHRH-A) in saline or a silastic pellet (100 µg.kg−1 body weight) and changes in plasma gonadotropin (GtH), 17α,20β-dihydroxy-4-pregnen-3-one (17α,20βP) and testosterone (T) levels were determined by radioimmunoassay. LHRH-A increased plasma GtH levels, with the response to LHRH-A in saline being of much greater magnitude and duration than the response to silastic pellet implants. Seasonal differences were found in the response to LHRH-A. Spermiated fish were the most responsive, recrudescing fish the least, and regressed fish displayed an intermediate response. Plasma 17α,20βP levels were elevated in response to LHRHA in fish of all sexual stages although the magnitude of the increase was not related to the magnitude of the increase in GtH levels. Treatment with LHRH-A also resulted in a transitory increase in plasma T levels. The endocrine control of GtH and steroid secretion in goldeye is discussed in relation to studies in cyprinids and salmonids.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02290257
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    Paper (German National Licenses)
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