Australian crayfish, carp from Europe and Asia, silver carp from China, Nile tilapia, the North American largemouth bass and mosquitofish, suckermouth catfish from South America and alien snails have invaded the park
Over the past 20 years, up to 2016, various organisations had spent nearly R350 million on alien plant control operations in the park
Rate of spread of invasive species has ‘dramatically increased’