+ Site Statistics
+ Search Articles
+ PDF Full Text Service
How our service works
Request PDF Full Text
+ Follow Us
Follow on Facebook
Follow on Twitter
Follow on LinkedIn
+ Subscribe to Site Feeds
Most Shared
PDF Full Text
+ Translate
+ Recently Requested

Cortisol effects on plasma electrolytes and thyroid hormones during smoltification in coho salmon Oncorhynchus kisutch



Cortisol effects on plasma electrolytes and thyroid hormones during smoltification in coho salmon Oncorhynchus kisutch



General and Comparative Endocrinology 81(3): 373-382



Plasma concentrations of Na+, K+, triiodothyronine (T3), and thyroxine (T4) and muscle water content were measured in yearling coho salmon. Oncorhynchus kisutch, after injection of cortisol in April, May, and June in fresh water (FW) and during acclimation to seawater (SW). Cortisol (17-21 micrograms/g), injected intraperitoneally in a melted cocoa butter suspension, suppressed the rise of plasma Na+ during SW acclimation in April but not in May or June. Muscle water content increased during SW acclimation in cortisol-treated fish in April and June. These observations suggest a hypoosmoregulatory function for cortisol during SW acclimation. Cortisol treatment also induced elevations of plasma K+ in FW (April only) and SW (April and May only). Cortisol treatment increased plasma T3 during SW acclimation in June and T4 in FW in May. The results suggest that cortisol may modify osmoregulatory processes and thyroid hormone activity during smoltification and acclimation to SW in yearling coho salmon.

Please choose payment method:






(PDF emailed within 0-6 h: $19.90)

Accession: 039698912

Download citation: RISBibTeXText

PMID: 2055437

DOI: 10.1016/0016-6480(91)90164-2


Related references

Smoltification and seawater adaptation in coho salmon (Oncorhynchus kisutch): plasma prolactin, growth hormone, thyroid hormones, and cortisol. General and Comparative Endocrinology 74(3): 335-345, 1989

Changes in plasma cortisol during stress and smoltification in coho salmon, Oncorhynchus kisutch. General and Comparative Endocrinology 59(3): 468-471, 1985

Plasma thyroid hormones during smoltification of yearling and underyearling coho salmon and yearling chinook salmon and steelhead trout Oncorhynchus kisutch, Salmo gairdneri. Aquaculture 28(1-2): 39-48, 1981

Cortisol secretion in vitro by the interrenal of coho salmon (Oncorhynchus kisutch) during smoltification: relationship with plasma thyroxine and plasma cortisol. General and Comparative Endocrinology 63(2): 191-200, 1986

Stunting of wild coho salmon oncorhynchus kisutch in seawater patterns of plasma thyroid hormones cortisol and growth hormone. Canadian Journal of Fisheries & Aquatic Sciences 49(3): 458-461, 1992

Effects of triiodothyronine and propylthiouracil on thyroid function and smoltification of coho salmon (Oncorhynchus kisutch). Fish Physiology and Biochemistry 4(3): 121-135, 1987

Effects of thyroxin, cortisol, growth hormone, and prolactin on lipid metabolism of coho salmon, Oncorhynchus kisutch, during smoltification. General and Comparative Endocrinology 64(2): 220-238, 1986

Changes in Cortisol Dynamics in Wild and Hatchery-Reared Juvenile Coho Salmon ( Oncorhynchus kisutch ) During Smoltification. Canadian Journal of Fisheries and Aquatic Sciences 51(10): 2179-2187, 1994

Cortisol and its effects on plasma thyroid hormone and electrolyte concentrations in fresh water and during seawater acclimation in yearling coho salmon, Oncorhynchus kisutch. General and Comparative Endocrinology 56(1): 146-155, 1984

Changes in plasma thyroxine during smoltification of coho salmon, Oncorhynchus kisutch. General and Comparative Endocrinology 36(2): 229-232, 1978

Changes in plasma corticosteroids during smoltification of coho salmon, Oncorhynchus kisutch. General and Comparative Endocrinology 46(1): 53-58, 1982

Clearance of plasma corticosteroids during smoltification of coho salmon, Oncorhynchus kisutch. Comparative Biochemistry and Physiology. A, Comparative Physiology 82(3): 531-535, 1985

Seasonal changes in plasma thyroxine kinetics in coho salmon Oncorhynchus kisutch during smoltification. Aquaculture 273(2-3): 329-336, 2007

Changes in plasma growth hormone and various metabolic factors during smoltification of coho salmon, Oncorhynchus kisutch. Aquaculture 82: 9-95, 1989

Plasma somatolactin levels in coho salmon (Oncorhynchus kisutch) during smoltification and sexual maturation. Fish Physiology and Biochemistry 11(1-6): 175-182, 1993