... activity, which became elevated after only 15 s of chasing. Several hours after stress, serotonergic activity recovered its basal levels, in parallel with the recovery of other stress markers such as plasma catecholamines and cortisol. Dopaminergic activity was also increased after stress, but only...

... and circulating catecholamines . Am. J. Physiol.   291 , R711 - R718 . Sandblom   E. , Farrell   A. P. , Altimiras   J. , Axelsson   M. , Claireaux   G. ( 2005 ). Cardiac preload and venous return in swimming sea bass (Dicentrarchus labrax L.) . J. Exp. Biol.   208 , 1927 - 1935...

... significant ( P <0.05) in the case of A ( Fig. 3B ). Fig. 1. Effects of i.p. administration of 5-HT (serotonin) on plasma glucose and catecholamine levels. (A) Dose-dependent increase in plasma levels of glucose 150 min after i.p. injection of 5-HT ( N =8). (B) Effects of i.p. injection of 5-HT (2...

... in vivo . Hence, we (1) injected neural and humoral antagonists into flounder ( Pleuronectes americanus ) in vivo to determine the contribution of autonomic innervation and circulating catecholamines to the control of resting cardiac function; (2)measured pre- and post-stress (90 s chase) catecholamine...

... Anguilla anguilla heart identifying, for the first time in a working fish heart, theβ3-AR-dependent negative inotropy discovered in mammals. * Author for correspondence at address 2 (e-mail: tota@unical.it ) 16 10 2006 © The Company of Biologists Limited 2006 2006 catecholamines...

...Brian McNeill; Steve F. Perry SUMMARY Experiments were performed to test the hypothesis that exposure of rainbow trout to repetitive hypoxia would result in a decreased capacity of chromaffin cells to secrete catecholamines owing to increased production of nitric oxide(NO), a potent inhibitor...

... cardiac output, a 14% greater post-stress blood haemoglobin concentration, 5–10% higher red muscle and heart aerobic enzyme (citrate synthase or cytochrome oxidase) activities, and twofold higher resting and 1.7× higher post-stress, catecholamine levels. However, gill surface area was the only...

...Steve F. Perry; Kathleen M. Gilmour ABSTRACT The marine dogfish ( Squalus acanthias ) and the seawater-adapted rainbow trout ( Oncorhynchus mykiss ) were exposed to acute environmental hypercapnia or hypoxia to evaluate (i) the dynamics of catecholamine release into the circulation and (ii...

... 1996 catecholamines hagfish Myxine glutinosa perfusion portal heart systemic heart venous blood pressure Several investigations in the past have shown that the systemic heart of hagfish behaves as if it is aneural ( Augustinsson et al . 1956 ; Jensen, 1965 ), even though nerves...

... with pronounced increases in the circulating levels of the catecholamine hormones (adrenaline and noradrenaline) measured on days 1, 3 and 7 of the stress regime. After 7 days, the numbers of high-affinity cell surface β -adrenoceptors were reduced in the physically stressed fish when measured in vitro under...

...Nicholas J. Bernier; Juan Fuentes; David J. Randall ABSTRACT The purpose of this study was to examine the role of adenosine receptors (ARs) in (1) the regulation of catecholamine secretion and (2) the modulation of blood oxygen capacitance by catecholamines. To this end, we assessed the response...

... in crocodilians, and the perfused heart preparation lends itself to this type of investigation. Perfused turtle heart preparations have been useful in investigating the effects of factors such as hypoxia, temperature and catecholamines on cardiac dynamics ( Wasser et al . 1990 ; Jackson et al . 1991 ; Comeau...

... 5 1994 ©The Company of Biologists Limited 1994 Oncorhynchus mykiss trout carbonic anhydrase ventilation respiratory acidosis catecholamines exercise red blood cell CO 2 excretion It is now well established that severe, exhaustive exercise causes an increase...

..., Burnaby, British Columbia, Canada V5A 1S6. 13 4 1994 ©The Company of Biologists Limited 1994 trout Oncorhynchus mykiss heart adrenaline hypoxia coronary cardiac performance catecholamines In fish, unlike mammals, the presence of a coronary circulation is species...

...M. Berenbrink; C. R. Bridges ABSTRACT The effects of catecholamines on the pH and the cellular ion and water content were investigated in red blood cells from the Atlantic cod ( Gadus morhua ). Noradrenaline induced a rapid decrease in the extracellular pH (pHe) of red blood cells suspended in a CO...

... and Bailey, 1982 ; Gray and Brown, 1985 ; Olson, 1992 ; Platzack et al . 1993 ). As in other vertebrates, Ang II acts directly on the teleost vasculature and a substantial part of its vasomotor effect may be caused by secondary release of catecholamines ( Nishimura et al . 1978 ; Carroll, 1981...

... the gill, the preparation clearly illustrates the potential for vasoactive agents to change the distribution of blood flow in the hagfish gill in a manner analogous with that found in the teleost fish gill. For example, in the Atlantic cod Gadus morhua , catecholamines, acting at α -adrenoceptors...

...Kathleen M. Gilmour; Nicole E. Didyk; Steve G. Reid; Steve F. Perry ABSTRACT In many teleost fish, including the rainbow trout, Oncorhynchus mykiss , catecholamines are mobilized into the blood in situations when enhanced oxygen transport is necessary, such as hypoxia, anaemia, hypercapnia...

...Steve F. Perry; R. Fritsche; S. Thomas ABSTRACT A variety of in vivo and in situ experiments were performed on the Atlantic hagfish ( Myxine glutinosa ) (i) to characterize the levels of circulating catecholamines during acute stresses, including hypoxia, anoxia or physical disturbance (air...

... catecholamines on red blood cell (RBC) O 2 and CO 2 transport. The addition of catecholamines (nominal final blood concentrations were 250nmol l −1 adrenaline and 20nmol l −1 noradrenaline) caused activation of RBC Na + /H + exchange both in vivo and in vitro as indicated by the reductions in whole-blood pH...