2019-01-14 General Committee Agenda - Attachment 2 to Item 2 - Aquatic Restoration and Management Options

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Option          Key actions                 Consequence for chosen indicators                                                         Other benefits            Key uncertainties           Cost        Pre-mortem
                                                                                                                                                                                            estimate
                                            Prawns     Bream     Whiting    Mullet       Birds      Yabbies Crabs          Biodiver
                                                                                                                           sity
                  through increase                                                                                                                                habitat blocks                         sediment habitat
                  hard substrate and                                                                                                                             What substrate to use
                  habitat mosaics
Prawn            Restocking of                                                                                                        Improved water           Unclear as to the         Requires     Displacement of existing
restocking        prawns into the                                                                                                       quality                   current status of the     further       species
                  lakes and river                                                                                                      Improved benthic          stocks and therefore if   info         Change in fishing
                                                                                                                                        habitat quality and       restocking would be                     practices / target species

                                                                                                                                 sediment turnover
                                                                                                                                       Increased
                                                                                                                                                                  required
                                                                                                                                                                 Current carrying
                                                                                                                                                                                                         No measurable
                                                                                                                                                                                                          improvement in fisheries
                                                                                                                                        recreational fishing      capacity of lakes and
                                                                                                                                        benefits through DIY      river
                                                                                                                                        bait and target          Displacement of rare
                                                                                                                                        species                   species
Restoration      Assess current                                                                                                       Improved water           Current condition of      Initial      No measurable
of Kin Kin        inputs and status of                                                                                                  quality                   the catchment             $100k; up     improvement in fisheries
catchment         catchment                                                                                                            Improved                 Extent of erosion /       to
                 Improved land
                                               §          §          § § § § § §                                                   connectivity for fish     accretion                 $1M+for
                  management                                                                                                            species                                             actions
                  practices                                                                                                            “Insurance” for
                                                                                                                                        other restoration
                                                                                                                                        options
Habitat          Improve habitat                                                                                                      Visual indicator of      Current carrying          $100K        Birds don’t use artificial
provision for     availability for iconic                                                                                               restoration success       capacity for raptors in                 roosts
Raptors           species raptor                                                                                                       Increased                 the estuary                            Not tangible benefit to
                  species by                                                                                                            community                Extent of roost use                     community

                                                                        
                  supplemental                                                                                                          engagement                                                       Possible mortality from

                                                                              
                  feeding                                                                                                              Community                                                         human interaction
                 Local education                                                            #                                          monitoring program
                  campaign and                                                                                                         Estuarine health
                  initiative                                                                                                            indicator
                                                                                                                                       Increased tourism
                                                                                                                                        opportunities
North Shore  Create a                                                                                                                 Increase in fish         Size of impact            $200K        Community backlash
management    “Restoration Zone”                                                                                                        movement / energy        Moving fishing                         No measurable
/vehicle      to restrict access                                                                                                        transfer between          pressure elsewhere                      improvement in fisheries
closure      Provide a buffer                                                                                                          estuary and coast                                                Poaching

                                                                                 
              between                                                                                                                  Possible increased
              recreational and
              commercial
                                                                                *          #^
                                                                                                                                       larval fish supply /
                                                                                                                                        food for other
              activities                                                                                                                species
             Ensure that any                                                                                                          Reduced fishing
              conservation zone                                                                                                         pressure
              includes both


       – Positive effect on indicator species                              * shorebirds (e.g. migratory waders, oystercatchers etc.); # raptors; ^ seabirds; § consequence not able to be assessed due to a

       – Negative effect on indicator species                                  lack of specificity about the actions to be taken