Under optimal pond conditions redclaw can grow from hatching to the smallest marketable size (~30 g)
within four months. Queensland redclaw usually mature at around six months of age, or 45-50 g, but it
may be possible to select for later maturing animals when selecting for faster growers.
From a PDF on raising them.....
http://www.nt.gov.au/d/Content/File/p/Fishnote/FN32.pdf