Chasing a little info on the Murray system and if Marron exist in the upper reaches?

I got a feed last night out of one of the Dam's but looking to head up stream a little more and have a look about.

anyone have any info would be greatly appreciated.

When I was a kid my old man used to take me up to Dwellingup and get some Marron up that way, anyone know if there are any about up there 20 odd years later?

Thanks