The Hazards of Cold Shock — When It is Cold Enough to Freeze Sharks

It is brutally cold on the Northeast coast of the US right now. Temperatures are hovering around the 20s F (in negative digits measured when in Celcius) from Virgina to the Canadian border. It is so cold there are reports of sharks freezing. Two thresher sharks were found dead on a Cape Cod beach, believed disabled by cold shock, which led to their stranding and death. 

Cold shock response is a physiological response to sudden cold, especially cold water. Newsweek reports that the program director of the Cape Cod-based Atlantic White Shark Conservancy [says] that it’s not uncommon for sea turtles to wash up on the beach after experiencing cold shock. However, sharks are water-breathing fish, so when they wash up on a beach, they can suffocate and die.

Cold shock is a leading cause of cold water deaths in humans, as well. When a person is immersed in cold water, there is an immediate, involuntary inhalation, which if underwater can result in drowning.  The cold also causes blood vessels to restrict, which put stress on the heart and raises blood pressure.  Cold shock can often induce heart attacks.

The RNLI notes that many deaths recorded by coroners are mistakenly attributed to either hypothermia, or drowning, when in fact the cause of death, or cause leading up to the death, is something different. One of the authors of the seminal work “Essentials of Sea Survival”, Professor Mike Tipton, is quoted as saying “if you are lucky enough to survive long enough to die of hypothermia, you have done very well; most die in the first minute of immersion”. It is cold water shock that tends to kill people around our shores.

We hope everyone stays warm and dry until the weather warms up. 

This entry was posted in Current, Lore of the Sea. Bookmark the permalink.

2 Responses to The Hazards of Cold Shock — When It is Cold Enough to Freeze Sharks

  1. Capt. J. Vincent Collins says:

    It is after all, winter in New England. Those Threshers may have been traveling in a warm core that broke up leaving them in the cold water as it moved back west.
    Or maybe the rich resource of seal meat my have kept them here longer than they normally would. The outer cape has become home to not only whites, but I wouldn’t be surprised to see bulls show up for an easy meal of tasty seal.

  2. Phil says:

    Cold?
    Try Cleveland for cold recently.

    Jan. 25, 1985, was
    Ohio record for wind
    chill with readings
    of 70 to 80 degrees
    below zero
    https://www.ohio.com/
    akron/news/jan-25-1985-
    was-ohio-record-for-wind-
    chill-with-readings-of-70-
    to-80-degrees-below-zero