The trout were taken from a hatchery raceway and then stocked in the Blue Hole, a deep, spring-fed lake popular with scuba divers but fatal to fish because of its low oxygen content. All of the trout were found dead Friday morning. The Blue Hole has an oxygen content of 1.1 parts per million. Rainbow trout need at least 6 parts per million to survive.

Anyone with information about the incident is urged to call Operation Game Thief toll-free, (800) 432-4263. Callers can remain anonymous and may be eligible for a reward if information leads to charges being filed.