Abstract:
:Steelhead and hybrid trout (rainbow trout male, steelhead female) presmolts and smolts, Oncorhynchus mykiss, exposed to 30/1000 seawater (SW) for 24 hr manifested progressively lower plasma sodium values from December to May. The increase in plasma sodium after 24 hr in SW diminished significantly after March, with the hybrids (which were heavier in weight than the steelheads) reaching their peak osmoregulatory ability in the middle of April, and the steelheads in late May. In fresh water there was little difference in plasma osmotic concentration but steelhead plasma chloride fell significantly from March 30 levels to May 23 levels, whereas hybrid plasma chloride levels did not change during this time. In steelheads but not hybrids, plasma cortisol correlated negatively with plasma sodium of fish exposed 24 hr in SW. However, in both steelheads and hybrids, plasma sodium values 24 hr after SW exposure had an inverse correlation with cytosol cortisol from the gills. Again, in both steelheads and hybrids, plasma values of fish exposed 24 hr in SW correlated positively with cytosol receptor activity. In hybrids, the nuclear extract receptor activity, Nmax, increased significantly until late March and then dropped significantly thereafter. In steelheads, there were no significant differences but Nmax followed the same trends as occurred in hybrids. Thus seasonal changes in cortisol and cortisol receptors in steelhead occur during smoltification and preparation for marine life and suggest an important role for cortisol. In hybrids there appears to be a reduction in seasonality.
journal_name
Gen Comp Endocrinoljournal_title
General and comparative endocrinologyauthors
McLeese JM,Johnsson J,Huntley FM,Clarke WC,Weisbart Mdoi
10.1006/gcen.1994.1012subject
Has Abstractpub_date
1994-01-01 00:00:00pages
103-13issue
1eissn
0016-6480issn
1095-6840pii
S0016-6480(84)71012-4journal_volume
93pub_type
杂志文章abstract::The objective of this study was to examine if RU486, a corticosteroid antagonist, modified hepatocyte metabolism and blocked the metabolic effects of exogenously administered cortisol in rainbow trout (Oncorhynchus mykiss). The fish were given a single intraperitoneal implant of either coconut oil alone or coconut oil...
journal_title:General and comparative endocrinology
pub_type: 杂志文章
doi:10.1006/gcen.1994.1160
更新日期:1994-10-01 00:00:00
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journal_title:General and comparative endocrinology
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journal_title:General and comparative endocrinology
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journal_title:General and comparative endocrinology
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更新日期:1990-06-01 00:00:00
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journal_title:General and comparative endocrinology
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更新日期:1991-09-01 00:00:00
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更新日期:2006-09-01 00:00:00
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pub_type: 杂志文章
doi:10.1006/gcen.1996.0162
更新日期:1996-11-01 00:00:00
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journal_title:General and comparative endocrinology
pub_type: 杂志文章
doi:10.1016/0016-6480(87)90188-2
更新日期:1987-09-01 00:00:00
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journal_title:General and comparative endocrinology
pub_type: 杂志文章
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更新日期:1989-09-01 00:00:00
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更新日期:1985-11-01 00:00:00
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journal_title:General and comparative endocrinology
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更新日期:1993-09-01 00:00:00
abstract::Transthyretin (TTR) is responsible for a major part of the binding of thyroid hormone to proteins in the plasma in amphibian tadpoles. To characterize the binding properties of amphibian TTRs, the effects of 17 hydrophobic signaling molecules, including 6 endocrine disruptors, on 3,5,3'-l-[(125)I]triiodothyronine ([(1...
journal_title:General and comparative endocrinology
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更新日期:2000-09-01 00:00:00
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abstract::The tegu lizard Salvator merianae is a large, widely distributed teiid lizard endemic to South America that exhibits annual cycles of high activity during the spring and summer, and hibernation during winter. This pattern of activity and hibernation is accompanied by profound seasonal changes in physiology and behavio...
journal_title:General and comparative endocrinology
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abstract::Seasonal patterns of fecal 17beta-OH-androgen, estrogen, and progesterone equivalents of male and female greylag geese (Anser anser) were analyzed in a flock of free-living geese. These were compared among social categories determined by pairbond status and breeding success. The annual cycle was divided into 13 phases...
journal_title:General and comparative endocrinology
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更新日期:1999-04-01 00:00:00
abstract::Application of alpha-MSH immunohistochemistry to the brain of elasmobranchs (Scyliorhinus torazame and Etmopterus brachyurus) demonstrated a marked species difference concerning the distribution of the alpha-MSH-like molecule in the brain. In S. torazame, alpha-MSH-like immunoreactive cells were present in the hypotha...
journal_title:General and comparative endocrinology
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