The two men and one woman later left the attraction allegedly with a stolen gray horn shark called Miss Helen in tow. Police say they found the shark at the home of the main suspect in the heist.
The San Antonio Aquarium later expressed hope that the small shark would "recover fully from the shock, and return to her home she is used to".
"We're so lucky they were amateur aquarium enthusiasts", Stellman said, adding that she saw several other sharks in the garage's tanks.
A 45-centimetre shark has been smuggled out of an aquarium in the U.S. in a baby stroller.
The chief also said two suspects have confessed to the aquatic crime.
Salvaggio said the motive for the theft was unclear, but said the group appeared to know precisely what they were seeking.
The suspects could face additional federal charges because of permits required to possess exotic animals, police said.
"Security footage indicated that the suspects brought their own net to capture the horn shark".
Aquarium manager Jenny Spellman told Global News that all three suspects were eventually apprehended and that the shark was on its way back to the facility in a transport bucket. However, the man refused to comply with the request, claiming his son was feeling ill and he must drive away immediately. She said she told him she had seen water leaking from the baby stroller.
Although the shark was back in its aquarium by Monday evening, the stress the poor fish endured during the ordeal might affect its chances of survival, which is not yet guaranteed.
On Monday night, police successfully rescued the shark and returned her to the aquarium. "I can't believe what she's been through, she's a little fighter".