Surveys taken over the past 30 years have revealed a significant declining trend in kangaroo numbers in most kangaroo management zones in NSW. In 2011, four large kangaroo species, the same four that can be commercially killed, were nominated for listing in New South Wales as threatened species.
Senator Lee Rhiannon of the Greens recently raised concerns in parliament over the nomination to the NSW threatened species list, asking why the issue has not received more attention. In her speech, she states" The published science of kangaroo reproductive biology and population ecology shows that the so-called population explosions described in the data-used to assert recovery from decline-are biologically impossible for this slow-breeding marsupial. Current analysis of the survey methodology and raw data is now suggesting systematic and massive inflation of kangaroo numbers, from which corresponding excessively inflated commercial shooting quotas are extracted-so that larger numbers may be shot from shrinking populations. Two years after its submission, the NSW Scientific Committee has still not made a decision on the nomination. Meanwhile, the commercial shooting industry continues to empty local landscapes of kangaroos in what has been described as the world's largest commercial slaughter of land based wildlife. Often landowners mop up what the commercial shooters fail to kill. But it seems that the idea that macropods-various kangaroo species-might be in trouble is one that simply does not register."
You can read more about the data at kangaroosatrisk.net.