The world's first artificially conceived dolphins have been born at Ocean Park, with experts saying the technique could reduce the need to capture animals in the wild for breeding.
The two bottlenose calves, born on May 14 and 25, now weigh about 15kg after weighing 12kg at birth.
They were conceived in May last year when four dolphins were artificially inseminated with sperm from 17-year-old Molly. Only 22-year-old Ada and Gina, 20, fell pregnant.
Suzanne Gendron, the head of Ocean Park's zoological operations and education department, said the baby dolphins were slightly larger at birth than calves born in the wild.
'They were born weighing in the upper limit for normal calves. They are both doing brilliantly, marvellous,' she said.
Ms Gendron said the park has been building up a sperm bank that could help maintain the genetic diversity of captive dolphins around the world without aquariums having to capture more animals.
She said the inbreeding of animals in captivity could result in health problems.