Blood pressure and heart rate during tonic immobility in the black tipped reef shark,Carcharhinus melanoptera

  title={Blood pressure and heart rate during tonic immobility in the black tipped reef shark,Carcharhinus melanoptera},
  author={Peter S Davie and Craig E. Franklin and Gordon Grigg},
  journal={Fish Physiology and Biochemistry},
Tonic immobility was induced in black tipped reef sharks (Carcharhinus melanoptera) and heart rate and ventral aortic blood pressure recorded. Without branchial irrigation, tonic immobility was correlated with a significant depression in blood pressure and heart rate irrespective of the sharks being in air or in water. Tonic immobility with branchial irrigation resulted in a significant increase in blood pressure in sharks in air, but not in water. Heart rate was unchanged when the gills were… 

Proven cardiac changes during death-feigning (tonic immobility) in rabbits (Oryctolagus cuniculus)

It is shown that TI is an alternative anti-predator behavior causing cardiac changes opposite to the “fight-or-flight” phenomenon, and it is proved that TI changes the cardiac function considerably.

Blood pressure in the Greenland shark as estimated from ventral aortic elasticity

Greenland shark arterial blood pressure is predicted to be very low (2.3–2.8kPa), based on the elasticity of its ventral aorta, supporting the idea that this species has a low aerobic metabolism.

Tonic immobility induction and duration on halmahera walking shark (Hemischyllium halmahera)

Based on the results, tonic immobility can be applied as non-lethal method to Hemiscyllium halmahera during capture and physical examination such as morphometric and weight measurement and heart rate, and breathing frequency.

Electrocardiogram, heart movement and heart rate in the awake gecko (Hemidactylus mabouia)

The methodology and instrumentation developed here are useful for non-invasive in vivo physiological and pharmacological studies in small reptiles without the need of physical restraint or anesthesia.

Removal of an Intracoelomic Hook via Laparotomy in a Sandbar Shark (Carcharhinus plumbeus)

Abstract:  A twenty-one-year-old male sandbar shark (Carcharhinus plumbeus) demonstrated signs of chronic weight loss even though its appetite remained unchanged. In addition, the gradual development

Tonic immobility as an anaesthetic for elasmobranchs during surgical implantation procedures

It is identified that tonic immobility provides an effective anaesthetic for surgical implantation in elasmobranchs, as it offers several benefits over chemical anaesthetics, both from a practical and from an animal welfare perspective.

The effects of predicted climate change conditions on tropical sharks

Myriad anthropogenic impacts drive declines in global shark populations; yet, the consequences of a newly recognised threat, global climate change, are poorly understood. This thesis tested the

A review of thanatosis (death feigning) as an anti-predator behaviour

It is demonstrated how apparently disparate observations in the recent literature can be synthesised through placing the behaviour within a cost-benefit framework in comparison to alternative behavioural choices, and how aspects of the ecology differentially affect costs and benefits.



Blood pressure and heart rate in the rabbit during animal hypnosis.

  • G. Carli
  • Medicine, Biology
    Electroencephalography and clinical neurophysiology
  • 1974

Induction and duration of tonic immobility in the lemon shark, Negaprion brevirostris

Regression analyses showed that massed trials of 12 per session increased the average duration of tonic immobility by 475 sec compared to spaced trials of 1 per session, which enabled us to develop a quantitative bioassay for use in testing chemical shark repellents.

The Relative Importance of Nervous, Humoral and Intrinsic Mechanisms in the Regulation of Heart Rate and Stroke Volume in the Dogfish Scyliorhinus Canicula

It has been concluded that there is no augmentary sympathetic innervation to the dogfish heart and the Starling relationship is responsible for the increase in stroke volume which accompanies the bradycardia during hypoxia.

Cardiorespiratory responses of skipjack tuna (Katsuwonus pelamis), yellowfin tuna (Thunnus albacares), and bigeye tuna (Thunnus obesus) to acute reductions of ambient oxygen

All three species were sensitive to , and mild hypoxia elicited significant cardiorespiratory adjustments, including increased m...


1. The capabilities of the oxygen transport system of rainbow trout in supplying the increased oxygen demands in exercise, in a water tunnel at 9–10.5 °C, have been investigated by increasing the

Responses of Swimming Skipjack (Katsuwonus pelamis) and Yellowfin (Thunnus albacares) Tunas to Acute Hypoxia, and a Model of Their Cardiorespiratory Function

Results from the model indicate that the cardiorespiratory system of tunas is capable of maximum rates of O2 delivery, even at low swimming speeds, that are approximately three times those of other active teleosts.

Use of respiratory‐cardiovascular responses of rainbow trout (Salmo gairdneri) in identifying acute toxicity syndromes in fish: Part 2. malathion, carbaryl, acrolein and benzaldehyde

Individual principal components analyses of the cardiovascular-respiratory responses of fish exposed to the four chemicals showed that the variables were highly correlated and that the first two principal components explained 55 to 70% of the variation in the 18 parameters analyzed.

Electroencephalographic-behavioral dissociations during animal hypnosis.

  • W. Klemm
  • Psychology, Biology
    Electroencephalography and clinical neurophysiology
  • 1966

Use of respiratory‐cardiovascular responses of rainbow trout (Salmo gairdneri) in identifying acute toxicity syndromes in fish: Part 1. pentachlorophenol, 2,4‐dinitrophenol, tricaine methanesulfonate and 1‐octanol

The general sets of responses described for these two fish acute toxicity syndromes have provided the initial information necessary to group similar responses caused by other chemicals into a fish uncoupler syndrome, a fish narcosis syndrome or some new syndrome.