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Wallaroo Common User Export Facility Marine Ecological Assessment

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Wallaroo Common User Export Facility Marine Ecological Assessment Wallaroo Common User Export Facility Marine Ecological Assessment Report for T-Ports Pty Ltd J Diversity Pty Ltd Rev 0, October 2020 Wallaroo Marine Ecological Assessment, October 2020 Cover photo: seagrass swimmer crab Nectocarcinus integrifrons in Posidonia sinuosa seagrass habitat. Photo: J. Brook, June 2020. Disclaimer The findings and opinions expressed in this publication are those of the author and do not necessarily reflect those of T-Ports Pty Ltd. While reasonable efforts have been made to ensure the contents of this report are factually correct, the author does not accept responsibility for the accuracy and completeness of the contents. The author does not accept liability for any loss or damage that may be occasioned directly or indirectly through the use of, or reliance on, the contents of this report. Revision history Rev Date Comment Author Reviewed A 19/08/2020 Initial Draft J. Brook M. Richardson B 10/09/2020 Modified according to review J. Brook M. Richardson C 21/09/2020 Modified according to review J. Brook M. Richardson and new information D 2/10/2020 Issued to client for circulation J. Brook 2 Wallaroo Marine Ecological Assessment, October 2020 Table of Contents 1 Introduction ....................................................................................................................................7 2 Methods..........................................................................................................................................8 2.1 Habitat mapping .....................................................................................................................8 2.1.1 Existing information........................................................................................................8 2.1.2 Towed camera survey .....................................................................................................8 2.1.3 Map generation.............................................................................................................12 2.2 Dive surveys ..........................................................................................................................12 2.2.1 Reef surveys ..................................................................................................................12 2.2.2 Seagrass surveys ...........................................................................................................12 2.3 Literature review...................................................................................................................12 3 Results...........................................................................................................................................13 3.1 Towed camera surveys .........................................................................................................13 3.1.1 Proposed transhipment area alternatives ....................................................................13 3.1.2 Proposed breakwater....................................................................................................14 3.2 Dive surveys ..........................................................................................................................16 3.2.1 Reef surveys ..................................................................................................................16 3.2.2 Seagrass surveys ...........................................................................................................17 3.3 Breakwater footprint habitat map........................................................................................24 3.4 Ecological values ...................................................................................................................26 3.4.1 Megafauna ....................................................................................................................26 3.4.2 Macroalgae ...................................................................................................................26 3.4.3 Invertebrates.................................................................................................................26 3.4.4 Fishes and sharks ..........................................................................................................27 3.4.5 Seabirds and shorebirds................................................................................................27 3.4.6 Marine pests .................................................................................................................27 3.5 Fisheries and Aquaculture ....................................................................................................28 3.5.1 Spencer Gulf Prawn Fishery ..........................................................................................28 3.5.2 Blue crab fishery............................................................................................................30 3.5.3 Marine Scalefish Fishery ...............................................................................................32 3.5.4 Central Zone Abalone fishery........................................................................................33 3.5.5 Aquaculture...................................................................................................................36 4 Impact Assessment .......................................................................................................................37 4.1 Direct loss of habitat from breakwater construction ...........................................................37 3 Wallaroo Marine Ecological Assessment, October 2020 4.2 Indirect impacts on habitats during breakwater construction .............................................38 4.3 Indirect impacts on habitats due to changed coastal processes ..........................................38 4.4 Impacts on seagrass from operations at the breakwater.....................................................38 4.5 Impacts on benthic habitats from transhipment point operations......................................38 4.6 Introduction of marine pests ................................................................................................39 4.7 Underwater noise .................................................................................................................39 4.8 Vessel interactions with marine megafauna ........................................................................41 4.9 Impacts on birds....................................................................................................................44 4.10 Impacts on fisheries and aquaculture...................................................................................45 5 Conclusions ...................................................................................................................................45 6 References ....................................................................................................................................46 Appendix A. Records of macroalgae within the Atlas of Living Australia search area......................51 Appendix B. Records of macroinvertebrates within the Atlas of Living Australia search area.........52 Appendix C. Records of fishes and elasmobranchs within the Atlas of Living Australia search area. .. .......................................................................................................................................54 Table of Figures Figure 1. Existing mapping at 1:100,000 (DEW 2020a, Edyvane 1999) Existing Mapping at 1:100 (DEW 2020b, c, Miller et al. 2009) ....................................................................................................................9 Figure 2. Habitat mapping 1:100 near the proposed causeway. Source: DEW 2020c, Miller et al. 2009. .....................................................................................................................................................10 Figure 3. Regional perspective of habitats surrounding the proposed breakwater. Source: DEW 2020a, c.................................................................................................................................................10 Figure 4. Water depth below lowest astronomical tide (LAT) near the proposed breakwater. Source: Flinders Ports 2020. ..............................................................................................................................11 Figure 5. Major habitat classes recorded on towed camera surveys in the proposed transhipment area alternatives. ..................................................................................................................................14 Figure 6. Towed camera habitat points over the proposed causeway footprint. State benthic habitat boundaries and habitat descriptors (DEW 2020) are shown (in red) for comparison. ........................15 Figure 7. Locations of dive transects within reef habitat (2 x 50 m) and seagrass habitat (4 x 30 m) with respect to towed camera habitat points. .....................................................................................16 Figure 8. Habitat map of the area surrounding the proposed breakwater. .........................................25 Figure 9. Spencer Gulf Prawn Fishery catch reporting blocks, prawn survey sites and bycatch survey sites near the proposed breakwater and PTAAs...................................................................................29 Figure 10. Spencer Gulf Prawn Fishery
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