Effects of acute stress on osmoregulation, feed intake, IGF-1, and cortisol in yearling steelhead trout ( Oncorhynchus mykiss) during seawater adaptation

Juvenile steelhead ( Oncorhynchus mykiss) acclimated to freshwater (FW) were subjected for 3 h to confinement stress in FW, and subsequently saltwater (SW, 25 ppt) was introduced to all tanks. Fish were sampled immediately after the stress treatment, and 1, 7, and 14 days after introduction of SW. E...

Full description

Saved in:

Bibliographic Details
Published in:	General and comparative endocrinology Vol. 148; no. 2; pp. 195 - 202
Main Authors:	Liebert, Anja M., Schreck, Carl B.
Format:	Journal Article
Language:	English
Published:	United States Elsevier Inc 01-09-2006
Subjects:	Adaptation, Physiological Animals Blood Glucose - analysis Body Size Brackish Calcium - blood Chlorides - blood Cortisol Eating - physiology Feed intake Feeding Behavior Freshwater Hydrocortisone - blood IGF-1 Insulin-Like Growth Factor I - analysis Lactic Acid - blood Magnesium - blood Marine Oncorhynchus mykiss Oncorhynchus mykiss - blood Oncorhynchus mykiss - metabolism Oncorhynchus mykiss - physiology Osmoregulation Potassium - blood Seawater - adverse effects Seawater adaptation Sodium - blood Stress Water-Electrolyte Balance - physiology Osmoregulation Cortisol IGF-1 Seawater adaptation Feed intake Stress
Online Access:	Get full text
Tags:	Add Tag No Tags, Be the first to tag this record!

Description
Summary:	Juvenile steelhead ( Oncorhynchus mykiss) acclimated to freshwater (FW) were subjected for 3 h to confinement stress in FW, and subsequently saltwater (SW, 25 ppt) was introduced to all tanks. Fish were sampled immediately after the stress treatment, and 1, 7, and 14 days after introduction of SW. Electrolytes, cortisol, glucose, and lactate showed the typical stress response expected after stress treatment in FW. Fish regained osmotic balance within 24 h. Glucose concentrations were increasing throughout the experiment and lactate levels stayed elevated during the time spent in SW. Insulin-like growth factor-1 (IGF-1) did not show an immediate response to stress but after transfer to SW we detected significantly higher concentrations for control fish at days 1 and 14. The differences in IGF-1 levels between stressed and control fish are not reflected in SW adaptability but positive correlations between IGF-1 and electrolyte levels in control fish may indicate its role for osmoregulation. Confinement stress did not impair feed intake subsequently in SW, but our results suggest that feed intake was suppressed by the change of the media from FW to SW.
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	0016-6480 1095-6840
DOI:	10.1016/j.ygcen.2006.03.002