SOUTHERN
PYGMY PERCH REPORT
Luke Pearce from DPI fisheries recently visited the
Blakney Creek area to sample various sites where Southern Pygmy Perch (SPP) had
been previously released. Below is a summary of his findings.
Three sites were sampled at Pudman
Creek - the original stocking location, which was stocked in 2010 and two sites
upstream. 10 adults were found at the original stocking location, 3 from the
next site (including evidence of successful spawning) and none were found at the
next site upstream. This shows good persistence at the original stocking
location and that the SPP have dispersed at least 3 km upstream and have
successfully spawned there this season.
Two refuge dams, originally stocked with 112 SPP in February 2015
were sampled. In the first dam, 151 SPP of two year classes were found. Some would
have spawned this spring and some were one year old fish from last year. This
is a very encouraging result and boasts well for what we are trying to do with
these sites. Only 7 SPP were found in the second refuge dam, but again of both
year classes, so this indicates at least two successful spawning events. Both
dams are very different which may give us some insight into what characteristics
we should be looking for in future sites. Interestingly, no larger fish from
the original stockings were captured at either site, which highlights how
reliant this species is on annual recruitment.
Southern
Pygmy Perch found in the refuge dam
A large dam on the top of Oolong Creek was sampled which has ideal SPP
habitat, unfortunately no SPP were found, only Mountain Galaxias. It does
however present itself as an ideal site for further translocations.
Sampling at a Dam near Oolong Creek
A Redfin barrier, constructed at Urumwalla Creek has sustained some
flood damage, but has held up relatively well given the magnitude of flow that
has been over it. SPP were found both
above and below the barrier. No redfin, a major predator of SPP, were found
which was very pleasing.
Redfin Rock Barrier
Overall, results of the visit were very encouraging
and we are certainly moving towards our goal of increasing the numbers of Southern
Pygmy Perch in this region. Unfortunately Luke did not hear or see any bell
frogs and this was the first trip where he has not.