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Caution for using ventilatory frequency as an indicator of stress in fish
(Elsevier B.V., 2004-04-30)
This study tested the use of ventilatory frequency (VF) as an indicator of stress in the Nile tilapia, Oreochromis niloticus (L.). Firstly, we tested the relationship between VF and plasma cortisol after confinement. ...
Ventilatory frequency indicates visual recognition of an allopatric predator in naive Nile tilapia
(Elsevier B.V., 2003-01-31)
Perceiving a possible predator may promote physiological changes to support prey 'fight or flight'. In this case, an increase in ventilatory frequency (VF) may be expected, because this is a way to improve oxygen uptake ...
Ventilatory frequency of Nile tilapia subjected to different stressors
(2006-12-12)
Ventilatory frequency (VF) was investigated in the fish Nile tilapia, Oreochromis niloticus, subjected to confinement, electroshock or social stressor. Fish were allowed to acclimatize to tank conditions for 10 days (1 ...
The breathing pattern and the ventilatory response to aquatic and aerial hypoxia and hypercarbia in the frog Pipa carvalhoi
(Elsevier B.V., 2012-07-01)
Anuran amphibians are known to exhibit an intermittent pattern of pulmonary ventilation and to exhibit an increased ventilatory response to hypoxia and hypercarbia. However, only a few species have been studied to date. ...
Raphe magnus nucleus is involved in ventilatory but not hypothermic response to CO2
(Amer Physiological Soc, 2007-11-01)
There is evidence that serotonin [ 5- hydroxytryptamine ( 5- HT)] is involved in the physiological responses to hypercapnia. Serotonergic neurons represent the major cell type ( comprising 15 - 20% of the neurons) in raphe ...
Ventilatory frequency and anesthetic efficacy in silver catfish, Rhamdia quelen: a comparative approach between different essential oils
(Brazilian Journal of Animal Science, 2023)
Environmental light color affects the stress response of Nile tilapia
(2013-02-01)
We investigated the effects of environmental light colors (blue, yellow and white) on the stress responses (measured by changes in ventilatory frequency - VF) of Nile tilapia to confinement. After 7 days of light treatment, ...
Gas exchange and ventilation during dormancy in the tegu lizard Tupinambis merianae
(Company of Biologists Ltd, 1999-12-01)
The tegu lizard Tupinambis merianae exhibits an episodic ventilatory pattern when dormant at 17 degrees C but a uniform ventilatory pattern when dormant at 25 degrees C. At 17 degrees C, ventilatory episodes were composed ...
Effects of temperature and hypercapnia on ventilation and breathing pattern in the lizard Uromastyx aegyptius microlepis
(Elsevier B.V., 2002-08-01)
In most reptiles, the ventilatory response to hypercapnia consists of large increases in tidal volume (V-T), whereas the effects on breathing frequency (f(R)) are more variable. The increased V-T seems to arise from direct ...