Wamberal Lagoon Catchment Aquatic Survey Final Report (PDF ...

No Gramastacus crayfish were collected within any of the waterways, the first indications
of crayfish activity was found in a small area of paperbark swamp along the western
edge of Achibold Park (northern side Crystal St-southern side The Entrance Road)(Figure
8). This area approximately 50m x 50m had scattered burrows through the forest floor
that conformed to the “bore hole’ type known to be created by Gramastacus crayfish.
However, despite extensive excavation of 3 burrow systems to a depth of 1m we were
unable to confirm their presence in this area south of The Entrance Road (POI030,
POI031 & POI032). This finding, however, inspired us to intensify our efforts in the
surrounding area to find Gramastacus crayfish.
Figure 8. Paperbark swamp - Crystal St
Figure 9. Gramastacus burrows
North of The Entrance Road is a low-lying wetland area and as it was flooded in
May, scoop netting surveys of the flooded reeds were conducted. Initially, small
juvenile crayfish were captured that indicated two separate species in the
area. Further sampling finally captured adult specimens from only one small
area 50m diameter and identification was confirmed. Two species of crayfish
were in residence both in relatively small numbers.
Figure 10. Wetlands north of the Entrance Road
Wamberal Lagoon Catchment Report Australian Aquatic Biological P/L 16