The effect of pancreatectomy on the survival of Anguilla rostrata in different salinities

Epple, August; Lewis, Thomas

doi:10.1002/jez.1401930325

Cited by 12 publications

(1 citation statement)

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“…However, the blood sugar is in a state of undampened equilibrium, and any superimposed stress results in hyperglycemia (Epple and Lewis 1977). On the other hand, pancreatectomized eels survive very poorly in sea water (Epple and Lewis 1975). This phenomenon seems to be related to an inability to correct transitory serum hyperosmolality and muscle dehydration which normally occur after transfer to sea water Epple and Miller 1981).…”

Section: Introductionmentioning

confidence: 98%

Circulatory catecholamines in the eel: origins and functions

Epple

Hathaway

Nibbio

1989

Fish Physiol Biochem

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While the three catecholamines (CAs) dopamine (DA), norepinephrine (NE) and epinephrine (E), are wide-spread in tissues of the American eel (Anguilla rostrata), the bulk of these CAs in the systemic blood originates from chromaffin cells in the wall of the posterior cardinal veins. In addition, the brain and unidentified structures in the opisthonephric kidney also release appreciable quantities of CAs. The functional realms attributed to systematically circulating CAs in teleosts comprise cardiovascular, respiratory, osmoregulatory, metabolic and endocrinotropic actions. In the eel, cardiovascular and respiratory effects are well established. However, we were unable to prove a physiological role of the CAs in osmoregulation. On the other hand, the eel is the only species among five vertebrates of greatly varying phylogenetic position (the others: hagfish, lamprey, rat, human) in which physiological doses of E were hyperglycemic. As in lamprey and rat, DA and NE are released in the eel by physiological doses of E. In addition, DA and NE also release the respective other two CAs. The physiological significance of the catecholaminotropic (CA-tropic) interactions remains to be established; however, the CA-tropic effect of E does not require the presence of the brain or 'preganglionic' nerve cells. In the eel, mild stress causes an immediate 'unorthodox' drop of plasma CAs, while stronger stress is followed by the expected increase of plasma CAs.

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Section: Introductionmentioning

confidence: 98%

Circulatory catecholamines in the eel: origins and functions

Epple

Hathaway

Nibbio

1989

Fish Physiol Biochem

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2003

The Eel

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Exogenous catecholamines do not affect osmoregulatory parameters in the intact eel

Epple

Kahn

1985

J. Exp. Zool.

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Injections of physiological (2 pglkg) and supraphysiological (8 pgkg) doses of dopamine, norepinephrine, and epinephrine via a cardiac cannula into freshwater-adapted eels were not followed by changes in serum osmolality, sodium, and chloride. Likewise, injections of 8 pgkg of epinephrine had no impact on these parameters in seawater-adapted eels. These results suggest that circulating catecholamines do not have a major effect on the overall balance of osmoregulatory serum components in the intact eel.

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The effect of pancreatectomy on the survival of Anguilla rostrata in different salinities

Abstract: Pancreatectomized yellow eel survive well in fresh water, but very poorly in sea water. The possiblility is discussed that these observations reflect a direct effect of islet hormones on the osmoregulation.

Cited by 12 publications

References 12 publications

Circulatory catecholamines in the eel: origins and functions

Circulatory catecholamines in the eel: origins and functions

References

Exogenous catecholamines do not affect osmoregulatory parameters in the intact eel

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