In February, we did some snapshot eDNA sampling at water quality sites across the Upper Billabong as part of Refreshing Rivers Program (learn more about eDNA here).

Unfortunately we didn’t pick up the Platypus, which means we will need to do some more targeted sampling. But – we did find a potential new site for the Southern Pygmy Perch in the Little Billabong. We know that there are fish in three other systems in the Mountain Creek and the upper Wantagong systems, but it was very surprising to find their eDNA show up in the top of the catchment.

Other interesting results – yes, there are still Murray Cod and Golden Perch (Yellowbelly) in the Upper Billabong (if I told you where, I would have to kill you 😉). We also picked up some other small-bodied native fish that were surprising, so we will be doing some more investigation. River Blackfish are the most widespread fish in the system next to Southern Pygmy Perch – certainly that matches what is being observed in these last few La Nina years. Carp, goldfish and mosquito fish are also at many sites.

There were records of a few interesting bats and a Krefts glider at one site, which was surprising. Rakali detected at three sites, but have certainly been observed at some of the others, just weren’t detected.

eDNA is certainly not infallible but it has given us some real insight into what is out there and we will definitely be doing some more strategic survey for the Platypus. The results indicate that Platypus are certainly not widespread and could be limited to very few animals. Recent media indicates that they can live up to 30 years, so let’s hope this isn’t the “last platy standing” in the Upper Billabong. Keen for everyone to keep their eyes peeled and report any potential sightings.

[Platypus image courtesy of www.prpw.com.au]