After park-goers noticed more than 30 koi floating belly-up in the large pond at Alice Keck Park Memorial Gardens Sunday morning, the City is investigating whether deteriorated water quality resulting from the failure of the aeration and water circulation system could have been the cause. Jill Zachary, assistant director of the city’s Parks and Recreation Department, said in a statement today that although the system was re-started and new water was added, further study of pond’s ammonia, nitrate, alkalinity, pH and dissolved oxygen will indicate how safe the water is for other animals. Surviving koi in the water seem to be responding well to the newly circulated water. Zachary also noted that the pond’s many resident turtles seem unaffected.