As you were told by NRW, if we eradicated all the catfish in that pond, you wouldn't be able to do that without eradicating all the other fish. So, I absolutely understand the information you were given from NRW. My understanding is that Brickfield pond is part of a former quarry and is a self-contained water body. It's not connected to any other sources of freshwater, so that means it's not possible for the catfish to spread to other areas, reducing wider risk.