Leatherback Sea Turtle

Leatherback Sea Turtle

Dermochelys coriacea

Size: to 70" and 1200 lbs.

Habitat: oceanic

Notes: The largest sea turtle in the world, and also the most likely to be seen in our cold waters, since Leatherbacks are at least partially warm-blooded! As implied by the name, they have a leathery flexible covering, rather than the bony hard shell of all other sea turtles - a unique feature that has caused them to be placed in a family of their own, apart from all other sea turtles. Leatherbacks feed on jellyfish.

Leatherback Sea Turtle
This one appears to have a propeller wound on its side.
It looks like it has been dead for a while.
Herb Segars Photography

From way back when in 1996 ...

NJ Scuba
Diving Myths
by Dr. Jolie Bookspan, author of Diving Physiology in Plain English

Myth 1 - The Dive Reflex Protects You

diving myths

In the dive reflex, heart rate and limb blood flow decrease. Careful science ( that means we didn't accidentally step on the thermisters ) shows time and again that the dive reflex does not reduce the need for oxygen underwater as it does in marine mammals. Field studies ( where you're allowed to step on the thermisters ) indicate that the dive reflex does not extend breath-holding time. Occasional cases of human survival after very cold water near-drowning are not due to the dive reflex. Cold is the likely mechanism behind the reduced metabolism that permits survival.