Dolphin die-off in Florida panhandle – 04/02/2004

  • September 30, 2013 at 6:39 pm #423

    Experts from nearly a dozen agencies are on the case, trying to learn
    if Red Tide is causing the Panhandle deaths.
    By TAMARA LUSH, Times Staff Writer
    Published April 2, 2004

    Florida Fish and Wildlife Conservation Commission biologist Alex
    Costidis examines one of the dozens of dolphins that beached
    themselves at St. Joseph’s Peninsula State Park last month.

    Just before sunset on March 10, wildlife rehabilitator Barbara Eells
    discovered a dead bottlenose dolphin lying on a deserted beach at St.
    Joseph’s Bay in the Florida Panhandle.

    A half-hour later, she spotted a second dead dolphin. Then a third.

    “Uh-oh,” Eells said to herself. “I hope this isn’t the beginning.”

    But it was.

    Since Eells made her grisly discovery, 103 more dolphin carcasses
    have washed ashore along Panhandle beaches. The most recent was found

    What’s killing them is a mystery that has sparked an investigation
    involving nearly a dozen state and federal agencies. Necropsies have
    been performed. Blood and urine tests taken.

    Toxicology tests are still pending, but experts say they have found
    evidence of Karenia brevis, a toxin produced by Red Tide algae, in
    the dolphins’ bodies.

    Yet no Red Tide bloom has been found in the Gulf of Mexico.

    “That’s the big mystery,” said Leanne Flewelling, marine research
    associate at the Florida Marine Research Institute in St.
    Petersburg. “There must be either currently or recently a bloom up
    that way that we just missed,” Flewelling said. “Maybe it’s sub-
    surface and we weren’t able to detect it.”

    Red Tide is a higher-than-normal concentration of a naturally
    occurring algae that can kill fish and other marine life while
    causing respiratory problems for people. Fish die after sucking the
    toxic particles through their gills and into their bloodstream;
    dolphins then eat the fish and become sick and die.

    “Somewhere adjacent to the shore along the Gulf, something happened,”
    Eells said. “Whatever it was killed these dolphins while they were
    eating. Their stomachs were full.”

    The Gulf of Mexico is home to 26 different kinds of dolphin species.
    Most people along Florida’s Gulf Coast usually spot the most common
    kind, the bottlenose dolphin.

    The dolphins have been living offshore. Researchers are trying to
    determine if the dolphins migrated, and where they were headed when
    they died.

    Water samples also have been taken from the Gulf from Pensacola to
    St. Joseph Bay. While no evidence of Red Tide toxin has been found,
    another harmful algae, Pseudo-nitzschia, was found in the water.

    A toxin caused by that algae was also found in the dolphins, said
    Blair Mase, fisheries stranding coordinator for the National Oceanic
    and Atmospheric Administration.

    “We’re suspecting right now that could be a cause,” Mase said. “With
    all the research going on right now, we’re closer to solving the
    mystery than ever before.”

    Pseudo-nitzschia produces domoic acid, a biotoxin commonly known as
    the cause of amnesic shellfish poisoning in humans.

    That can be a life-threatening syndrome, with gastrointestinal and
    neurological symptoms. In 1987, four people died after eating toxic
    mussels from Prince Edward Island in Canada.

    Florida has seen large-scale dolphin deaths before. In 1999, about
    100 dolphins died near the Panhandle. Red Tide was suspected then,
    Mase said.

    In 1987, viruses affected dolphins along the Atlantic coast and about
    700 dolphin carcasses washed ashore from New Jersey to Florida that

    None of the dolphins had viral infections, she said. A dolphin that
    recently washed ashore in Pinellas County had some kind of infection,
    experts say.

    That 418-pound dolphin was discovered near the Don CeSar Hotel in St.
    Pete Beach last week. Rescuers took it to the Mote Marine Laboratory
    in Sarasota, where it is recovering, Mote said.

    Experts say they don’t think a wave of dolphin carcasses will wash
    ashore in Pinellas County because there is no indication of algae

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