Yeah Habitat disruption and loss is an even greater threat. Especially water quality.
Carp make good fertiliser and if your determined enough and can cook a little you can eat them.
I've seen feral cats the size of cattle dogs in the Budawang ranges and some not quite so large much closer to human habitation.
(my dogs (kelpie and coolie) had one treed and I'm sure the dogs had no idea how lucky they were !)
I'm sure that thing could have beaten up one of the dogs alone.