41 raies mortes faute d'oxygène au zoo de Calgary

[Animal 0]

Cownose rays died because of oxygen level


ctvcalgary.ca


The Calgary Zoo admits they knew months ago what caused the death of 41
cownose rays.
Dr. Clement Lanthier, the president and CEO of the Zoo, says human error and
faulty equipment is to blame. "There were four pumps, including the
life-support system, and occasionally one was failing and in the past that
happened for many weeks," says Lanthier.

Lanthier says he knew as early as November that oxygen levels were too low
for the animals to survive. "We believe the dissolved oxygen was too low.
The life-support system was not designed to provide enough dissolved
oxygen," said Lanthier.

Up to this point, officials with the Zoo said there were a number of
potential causes for the death. "Several possibilities remain including
unknown toxins or possible deficiency of dissolved oxyben in the water but a
conclusive cause may never be known," the Zoo stated in a December press
release.

Lanthier also admitted on Tuesday that the Zoo's lack of expertise in
dealing with aquatic animals was also an issue.

The Zoo's admission of error is fueling criticism from animal advocates.
"They put these animal's lives at risk. They played Russian roulette with
the welfare of these animals and unfortunately they all died," says RJ
Dailout, a spokesperson for Zoocheck Canada.

A new ray exhibit is already open and the tank's life-support system has
been upgraded.

[Animal 0]

après la mort de ces 41 raies, une autre vient de mourir de parasites cette fois dans ce même zoo de Calgary! ... Je me demande si ces raies sont capturées en mer -


Parasite claims stingray at Calgary Zoo

Last Updated: Sunday, February 1, 2009
CBC News


The zoo reopened its stingray exhibit seven months after the unexplained
deaths of 41 rays. (Courtesy www.lifeincalgary.ca)

A new stingray at the Calgary Zoo has died of a parasite, less than a year
after the unexplained death of 41 rays.

Ten new stingrays delivered to the zoo in December came with a parasite that
causes skin discolouration, said zoo spokeswoman Laurie Herron.

"Most people that have aquariums know that occasionally you have to treat
for parasites," she told CBC News on Sunday. "There's a number of different,
common ones and it's probably not unlike deworming your dog or cat. They
pick up these parasites and you have to try to get rid of them."

The ray that died a few days ago was in particularly bad shape when it
arrived, Herron said.

"Because of its weakened state, it ended up not being able to cope with the
parasite, but as far as I know ,the treatments are working and they're
treating the other rays daily, and everybody else seems to be doing OK."

The zoo reopened the stingray exhibit last month after the sudden deaths of
41 of 43 stingrays in May. Despite an investigation, zoo officials could not
find a conclusive cause of death.

The original display was designed for visitors to touch the rays, but that
was abandoned when the exhibit reopened.

Earlier this month, a two-year-old male Turkmenian markhor, a type of wild
goat, died in an accident at the zoo when the animal became entangled in a
toy.
http://www.cbc.ca/canada/calgary/story/2009/02/01/cgy-calgary-zoo-stingray-d
ies-parasite.html