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TRUMPETER BAY MF261 (Block SB3): BASELINE ENVIRONMENTAL ASSESSMENT

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TRUMPETER BAY MF261 (Block SB3): BASELINE ENVIRONMENTAL ASSESSMENT TRUMPETER BAY MF261 (Block SB3): BASELINE ENVIRONMENTAL ASSESSMENT DRAFT FINAL REPORT (VERSION 1.0) August 2019 Report to: Huon Aquaculture Group Pty Ltd Prepared by: AQUENAL PTY LTD AQUENAL www.aquenal.com.au MF261 BLS SB3 Document Distribution Document Date Name Company Version Copies Type Huon Aquaculture 2/9/2019 Adam Smark Electronic 1.0 1 Group Pty Ltd 2/9/2019 Mark Churchill EPA Electronic 1.0 1 COPYRIGHT: The concepts and information contained in this document are the property of Aquenal Pty Ltd. Use or copying of this document in whole or in part without the written permission of Aquenal Pty Ltd constitutes an infringement of copyright. DISCLAIMER: This report has been prepared on behalf of and for the exclusive use of Aquenal Pty Ltd’s client and is subject to and issued in connection with the provisions of the agreement between Aquenal Pty Ltd and its Client. Aquenal Pty Ltd accepts no liability or responsibility whatsoever for or in respect of any use of or reliance upon this report by any third party. MF261 BLS SB3 Contents 1 Summary ................................................................................................................................................................... 6 2 Operational Summary ............................................................................................................................................... 9 3 Location and Survey Maps ...................................................................................................................................... 10 4 Current Measurements ........................................................................................................................................... 11 5 Bathymetric Profile ................................................................................................................................................. 15 6 Seabed Characteristics and Habitat Profile ............................................................................................................. 16 7 Underwater Video Survey ....................................................................................................................................... 17 7.1 Filming Summary ............................................................................................................................................. 17 7.2 Observations from Filming ..................................................................................................................................... 21 8 Sediment Chemistry ................................................................................................................................................ 25 8.1 Visual Assessment ........................................................................................................................................... 25 8.2 Redox Potential ...................................................................................................................................................... 31 8.3 Sulphide Analysis.................................................................................................................................................... 32 8.4 Particle Size Analysis .............................................................................................................................................. 33 8.5 Organic Content ..................................................................................................................................................... 35 8.6 Heavy Metal Analysis ............................................................................................................................................. 36 9 Targeted Gazameda gunnii Survey ......................................................................................................................... 37 10 Biological Analysis – Benthic Infauna ...................................................................................................................... 39 11 References ............................................................................................................................................................... 43 List of Figures Figure 1 Location and Survey Map – MF261 – SB3, Trumpeter Bay. Sites 1.1 – 10.3 indicate the 35 m compliance sites, C3 and C5 indicate control sites; IF1-IF10 indicate internal sites. Red outline – zone boundary; black rectangle – lease boundary. ....................................................................................................................................................... 10 Figure 2 Polar plots of current velocity and direction, T2 (May – June 2014). The plots are read as if the current flow moves from the outer circle towards the centre of the graph. .............................................................................. 13 Figure 3 Polar plots of current velocity and direction, T4 (February - April 2014). The plots are read as if the current flow moves from the outer circle towards the centre of the graph. ...................................................................... 14 Figure 4 Bathymetric profile for MF261 – SB3. Red outline – zone boundary; black rectangle – lease boundary for MF261 – SB3............................................................................................................................................................ 15 Figure 5 Survey habitat map. Red outline – zone boundary; black rectangle – lease boundary for MF261 – SB3. ......... 16 Figure 6 Redox potential at 30 mm depth in sediment cores. Bars represent mean redox potential (± SE error) across replicate cores (n=3 for compliance and control sites; n=10 for internal farm sites). ............................................ 31 Figure 7 Sulphide concentration in sediment core samples. Bars represent mean sulphide concentration (± SE error) across replicate cores (n=3 for compliance and control sites; n=10 for internal farm sites). ................................. 32 Figure 8 Particle size analyses of the top 100 mm of sediment. Lines represent mean percentage cumulative volume for size fractions at each site, based on pooled replicates for compliance (n=3), control (n=3) and internal farm (n=10) sites. ............................................................................................................................................................. 33 Figure 9 Mean particle size content (%) of the top 100 mm of sediment. Results represent % contribution of each sediment size category across replicate samples (n=3 for compliance and control sites; n=10 for internal farm sites). ....................................................................................................................................................................... 34 Figure 10 Organic content in sediment core samples. Bars represent mean organic content (± SE error) across replicate cores (n=3 for compliance and control sites; n=10 for internal farm sites). ........................................................... 35 Figure 11 Location of grab samples taken during the targeted Gazameda gunnii survey for MF261 - Block SB3, highlighting the sample sites where dead shells were collected (G9, G11, G14, G17, G18, G21, G28, G29). ........ 37 Figure 12 Photograph of dead G. gunnii shells collected during the survey of MF261-Block SB3. .................................. 38 MF261 BLS SB3 Figure 13 Results of MDS analysis using benthic infauna data collected from benthic grabs for MF261 – SB3. Symbols represent data from individual replicate samples for compliance, control and internal farm sites. Ellipses indicate community similarity (%) based on cluster analysis................................................................................................ 40 Figure 14 Benthic infauna analysis of seabed samples at MF261 – SB3. K-dominance curves. Analysis based on pooled data for compliance (n=3), control (n=3) and internal farm (n=10) sites. .............................................................. 42 List of Tables Table 1 Summarised current velocity data (cm/s) for Trumpeter T2 (May 2014) and T4 (March 2014). ........................ 12 Table 2 Descriptions of dives performed at MF261 – Block SB3. ..................................................................................... 18 Table 3 Description of each ROV dive performed at Trumpeter Bay MF261 – Block SB3. Video analysis and interpretation provided by Huon Aquaculture. ...................................................................................................... 22 Table 4 Visual description of sediment cores at MF261 – Block SB3. ............................................................................... 26 Table 5 Summary of heavy metal analysis of sediment samples and comparison with the ANZECC 2000 trigger values. Results represent mean concentrations (± SE error) across replicate cores (n=3 for compliance and control sites; n=10 for internal farm sites). Raw data is provided in Appendix 6. ........................................................................ 36 Table 6 Summary of benthic faunal analysis. The category ‘other’ included brachiopods, nemerteans, nematodes, enteropneusta, anthozoans, platyhelminths, sipunculids, phoronids and chordates ............................................ 41 List of Appendices Appendix 1 Survey coordinates for sediment sampling, based on the Mapping Grid of Australia Zone 55 (Datum GDA94) ...................................................................................................................................................................
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