2015-10-13 Planning & Organisation Agenda Attachment 1 to Item 7 Oyster Recruitment Assessment Report

 a)                                                    b)




      Figure 9.   Recruitment of oysters on subtidal tiles from (a) Site WC2 and (b) Site LW2 after 5
                  months

3.2 Estimated Growth Rate of Planostrea pestigris
The initial average size of oysters after 2 months deployment was 3 mm, with a maximum
size of 8 mm. After 3 months, average size was 14 mm, and after 5 months the average size
was 20 mm, and maximum size was 38 mm (excluding oysters under 12 cm as having
settled more than 2 months after deployment). This assumes that settlement and recruitment
of oysters occurred in the first month of deployment, otherwise this represents a low estimate
of growth.

                               25


                               20
                   Size (mm)




                               15


                               10


                               5                                         y = 4.0355x
                                                                         R² = 0.9178
                               0
                                    0   1      2            3       4          5          6
                                                   Time (months)


      Figure 10. Estimate of linear growth rate using average size of the oyster (P. pestigris) after 2, 3
                 and 5 months deployment


Restoration of Noosa Estuary: An Assessment of Oyster Recruitment                                        12