Animals Asia, a Hong Kong-based organisation, created a petition calling for the closure of the Grandview aquarium in the Chinese city of Guangzhou that attracted half a million signatures.
Photos of Pizza shared widely on social media show the bear lying listlessly on the ground in a gloomy, windowless room while visitors crowd around taking photos on their cell phones.
Activists said the Yorkshire Wildlife Park in England had offered to adopt Pizza on condition that he was not replaced by another polar bear, adding the zoo would not pay for the animal due to "fear that any funds could be used to buy more animals".
"Yorkshire Wildlife Park has not contacted us," said the general manager of the aquarium, a man surnamed Fan who refused to give his full name.
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"We are a legally compliant aquarium, run according to Chinese standards and protecting animal rights. In the future we will strengthen the protection of animal rights and welfare," he added.
The cost of transferring the large, living carnivore nearly 10,000 kilometres from Guangzhou to Doncaster, England "will be raised if the offer is accepted", Animals Asia said.
The animal welfare director of Animals Asia, Dave Neale, said in a statement that the aquarium "have the chance to put their mistake right" and end the crush of negative media attention.
The group has been publicising Pizza's plight since the beginning of the year.
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