An outdoor lagoon at a western Michigan zoo is being shut down following the deaths of 21 stingrays and sharks.
MLive.com reports Friday that the exhibit at John Ball Zoo in Grand Rapids has been dismantled.
Eighteen cownose stingrays and three spotted bamboo sharks were found dead July 8 after a mechanical malfunction shut off one of two pumps to the lagoon. Low oxygen levels were found in water samples.
Zoo Chief Executive Peter D'Arienzo says no new stingray exhibit will be built until officials determine that a state-of-the-art, weather protected facility that can assure the animals' safety can be built.
More than 50 stingrays died last summer after oxygen levels in their tank dropped too low at an exhibit at the Brookfield Zoo in suburban Chicago.