As pond owners and koi hobbyests, we all hate to see this in the news!
 
 ST. GEORGE, Utah — Dumping unwanted goldfish or other aquatic pets into reservoirs might seem like a humane way to dispose of them, but these invasive species can wreak havoc on fisheries, the St. George News reports.
Problematic fish include large koi in the Baker and Ivins Reservoirs, though nearly all community fisheries in the St. George area have them, the Utah Division of Wildlife Resources (DWR) says.
 
Dumping pet goldfish into reservoirs can turn them into predators (fox13now.com)