 As a hedge against disaster striking the blue iguana population on Grand Cayman , an off @-@ island captive population was established in 25 zoos in the USA . A minimum of 20 founder lines represented by at least 225 individuals is being maintained by captive breeding and recorded in a studbook for the species by <unk> Grant of the San Diego Zoo 's Center for Conservation and Research for Endangered Species ( <unk> ) . The Indianapolis Zoo has had success with breeding the blue iguana in captivity twice since the year 2000 . 
