Post-prandial respiratory gas and acid-base profiles in the gastrointestinal tract and its venous drainage in freshwater rainbow trout (Oncorhynchus mykiss) and seawater English sole (Parophrys vetulus)

2021 ◽  
pp. 111123
Author(s):  
Ellen H. Jung ◽  
Colin J. Brauner ◽  
Chris M. Wood
Keyword(s):  
Rainbow Trout ◽  
Gastrointestinal Tract ◽  
Oncorhynchus Mykiss ◽  
Venous Drainage ◽  
English Sole ◽  
Acid Base ◽  
Rainbow Trout Oncorhynchus Mykiss ◽  
Parophrys Vetulus

Effects of gastric distension on the cardiovascular system in rainbow trout (Oncorhynchus mykiss)

2008 ◽  
Vol 294 (5) ◽  
pp. R1648-R1656 ◽  
Author(s):  
Henrik Seth ◽  
Erik Sandblom ◽  
Susanne Holmgren ◽  
Michael Axelsson
Keyword(s):  
Blood Pressure ◽  
Blood Flow ◽  
Rainbow Trout ◽  
Gastrointestinal Tract ◽  
Arterial Pressure ◽  
Oncorhynchus Mykiss ◽  
Vascular Resistance ◽  
Stomach Wall ◽  
Rainbow Trout Oncorhynchus Mykiss ◽  
Chemical Stimuli

When animals feed, blood flow to the gastrointestinal tract increases to ensure an adequate oxygen supply to the gastrointestinal tissue and an effective absorption of nutrients. In mammals, this increase depends on the chemical properties of the food, as well as, to some extent, on the mechanical distension of the stomach wall. By using an inflatable nitrile balloon positioned in the stomach, we investigated the cardiovascular responses to mechanical stretch of the stomach wall in rainbow trout ( Oncorhynchus mykiss). Distension with a volume equivalent to a meal of 2% of the body mass increased dorsal aortic blood pressure by up to 29%, and central venous blood pressure increased transiently nearly fivefold. The increase in arterial pressure was mediated by an increased vascular resistance of both the systemic and the intestinal circulation. Cardiac output, heart rate, and stroke volume (SV) did not change, and only transient changes in gut blood flow were observed. The increase in arterial pressure was abolished by the α-adrenergic antagonist prazosin, indicating an active adrenergic vasoconstriction, whereas the venous pressor response could be the consequence of a passive increase in intraperitoneal pressure. Our results show that mechanical distension of the stomach causes an instantaneous increase in general vascular resistance, which may facilitate a redistribution of blood to the gastrointestinal tract when chemical stimuli from a meal induce vasodilation in the gut circulation. The normal postprandial increase in gut blood flow in teleosts is, therefore, most likely partly dependent on mechanical stimuli, as well as on chemical stimuli.

Acid-base disequilibrium in the venous blood of rainbow trout (Oncorhynchus mykiss)

1997 ◽  
Vol 2 (1) ◽  
pp. 1-10 ◽  
Author(s):  
S. F. Perry ◽  
C. J. Brauner ◽  
B. Tufts ◽  
K. M. Gilmour
Keyword(s):  
Rainbow Trout ◽  
Oncorhynchus Mykiss ◽  
Venous Blood ◽  
Acid Base ◽  
Rainbow Trout Oncorhynchus Mykiss
Sign in / Sign up

Export Citation Format

Share Document