Cortisol dynamics in North American eels (Anguilla rostrata LeSueur)

Goodman, Joel H.; Butler, David G.

doi:10.1016/0016-6480(76)90181-7

Cited by 5 publications

(3 citation statements)

References 28 publications

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“…Although CBG is not yet identified in teleosts, a similar binding protein of high affinity and low capacity has been characterized in at least 20 species of fish. In addition, a second carrier protein system, analogous to human serum albumin, with a low affinity and an unlimited capacity for cortisol, has also been shown to be present in fish 26,27 . As binding sites of the CBG‐like protein become saturated with cortisol, binding to the second carrier protein will occur 28 .…”

Section: Introductionmentioning

confidence: 99%

“…In addition, a second carrier protein system, analogous to human serum albumin, with a low affinity and an unlimited capacity for cortisol, has also been shown to be present in fish. 26,27 As binding sites of the CBG-like protein become saturated with cortisol, binding to the second carrier protein will occur. 28 The percentage of free to total plasma cortisol (free percentage) may vary from 10 to 40% in fish, [28][29][30][31] and free percentage can be altered by sexual maturation 28,29 and longterm handling stress.…”

Section: Introductionmentioning

confidence: 99%

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Individual variations in behavior and free cortisol responses to acute stress in tiger pufferfishTakifugu rubripes

2008

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The aim of the present study was for individual variation in behavior to be characterized and related to differences in physiological stress responses in juvenile tiger pufferfish (fugu) Takifugu rubripes. A set of siblings (n = 330) from wild parents was subjected to behavior tests, and some were classified into active and inactive groups (n = 42 each group). The active animals consisted of those individuals that kept active swimming during 6 min after transfer from one tank to another, and the inactive animals were those that stopped swimming within 6 min. Time-course acute stress responses, which were elicited by anesthesia and subsequent removal of a pectoral fin, were compared between the active and inactive fish. The stress indicators used were free and total plasma cortisol, and plasma glucose. Although no significant difference was observed at each sampling point between groups, the inactive fish required shorter recovery time from acute stress in all three indicators than the active fish. The percentage of free to total plasma cortisol in the pre-stress condition was significantly lower in the inactive group than in the active group. Our findings indicate that fugu has behavioral variation that is associated with stress responsiveness. The inactive fish are expected to be more tolerant of stress and suitable for aquaculture.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Individual variations in behavior and free cortisol responses to acute stress in tiger pufferfishTakifugu rubripes

2008

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“…However, very little attention has been given to the clearance of the hormone from the blood which plays a significant role in the regulation of its plasma level. Most of the research on clearance of steroids in fish concerns corticosteroids (ldler et al , 1963 ;Fagerlund, 1968, 1969;Pagerlund andDonaldson, 1969, 1970;Idler and Truscott, 1969;Owen and Idler, 1972;Henderson et al, 1974;Leloup-Hatey, 1974Goodman and Butler, 1976;Truscott et al, 1977;Patina et al, 1985) but very little deals with sexual steroids.…”

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confidence: 99%

The metabolic clearance rate of estradiol-17β in rainbow trout, Salmo gairdneri R., estimated by both single injection and constant infusion methods: Increase during oocyte maturation

Baroiller

Fostier

Zohar

et al. 1987

General and Comparative Endocrinology

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A dual cannulation of free-swimming rainbow trout is used to estimate the metabolic clearance rate (MCR) of Estradiol-17 beta (E2-17 beta) by both single injection and constant infusion methods. It is shown that E2-17 beta MCR changes significantly during the progress of oogenesis, mainly at the end of the sexual cycle. The same changes in MCR and very similar values are found with both single injection and constant infusion methods: MCR is stable (28.8 ml/hr/kg) from the postovulation period (throughout endogenous vitellogenesis) to early exogenous vitellogenesis. It decreases significantly during advanced exogenous vitellogenesis (18.7 ml/hr/kg) and increases clearly at the onset of oocyte maturation (40.9 ml/hr/kg). A direct relationship between MCR and plasma E2-17 beta occurs: Plasma E2-17 beta levels increase (advanced exogenous vitellogenesis) when MCR decreases. Then estradiol decline takes place at the same time that MCR reaches its highest values (oocyte maturation). An increase in MCR is probably one event required to allow the establishment of an appropriate hormonal environment for oocyte maturation.

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Plasma kinetics of ingested tritiated estradiol and the influence on estradiol plasma levels in the cultured Siberian sturgeonAcipenser baeri

Pelissero

Menn

Narbonne

1991

Fish Physiol Biochem

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Plasma kinetics of tritiated estradiol (E2) were studied in the Siberian sturgeonAcipenser baeri in order to explain the large amount of E2 found in plasma of 4, 5 and 10-year-old cultured males. This work presents two approaches. The first is based on a single ingestion of(3)H-labelled E2, which allowed us to plot model curves of resorption and elimination processes. The second deals with chronic ingestion of(3)H-labelled E2 during a five day period, twice a day, based on a rhythm copied from the feeding practice on a fish farm. Three different doses were tested, based on the amount present in fish diets. Oral administration of E2 to sturgeon leads to E2 accumulation and a saturation of the metabolic processes generally involved in the elimination of aromatic xenobiotics. An explanation of this progressive accumulation of E2 in sturgeon plasma has to take into account the steroid binding proteins. Their synthesis could be induced by the orally administrated E2 and protect it from metabolism.

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Cortisol dynamics in North American eels (Anguilla rostrata LeSueur)

Cited by 5 publications

References 28 publications

Individual variations in behavior and free cortisol responses to acute stress in tiger pufferfishTakifugu rubripes

Individual variations in behavior and free cortisol responses to acute stress in tiger pufferfishTakifugu rubripes

The metabolic clearance rate of estradiol-17β in rainbow trout, Salmo gairdneri R., estimated by both single injection and constant infusion methods: Increase during oocyte maturation

Plasma kinetics of ingested tritiated estradiol and the influence on estradiol plasma levels in the cultured Siberian sturgeonAcipenser baeri

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