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

 a)                                                            b)




      Figure 6.          Recruitment of oysters on intertidal tiles from (a) Site T1-I- and (b) Site WC3-I, after 5
                         months

There were at least two major oyster recruitment events in intertidal habitats (December–
January and March–April), as demonstrated by the bimodal nature of the size-frequency
graph (Figure 7). The greatest number of recruits was recorded at Site WC3, with these
oysters likely recruiting in March-April 2015 assuming growth rates of approximately 4 mm
per month (see growth rate estimate below).

                    80
                    70
                    60
                    50
                    40
        Frequency




                    30
                    20
                    10
                     0
                          0-4      5–8     9–12 13–16 17–20 21–24 25-28 29–32 32–36 36–40
                                                          Size Class (mm)


                           LW1-I         LW2-I     WC1-I       WC3-I       GI1-I      T1-I     D1-I

      Figure 7.          Size-frequency distribution of oysters (P. pestigris) deployed at intertidal sites


Restoration of Noosa Estuary: An Assessment of Oyster Recruitment                                                 10