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Status of Trout-free Waters in the Tasmanian Wilderness World Heritage Area Report to Department of Primary Industries, and Water, Hobart. PE Davies, LSJ Cook, WR Robinson, T Sloane June 2009 82 Waimea Ave, Sandy Bay, FFrreesshhwwaatteerr Tasmania Australia 7005 Ph/Fax: 03 62254660 SSyysstteemmss [email protected] Aquatiic Enviironmentall Consulltiing Serviice Table of Contents Executive Summary ............................................................................................................................. 3 Acknowledgements ............................................................................................................................. 5 1. Aims and Background ..................................................................................................................... 6 1.1 Aims ........................................................................................................................................... 6 1.2 Alien fish in the Tasmanian Wilderness World Heritage Area .................................................. 6 1.3 Brown trout ............................................................................................................................... 7 1.4 Value of trout-free waters ........................................................................................................ 8 2. Mapping the Distribution of Trout-free Waters ........................................................................... 10 2.1 Fish distribution database ....................................................................................................... 10 2.2 Exotic fish distribution map .................................................................................................... 10 3. Distribution in the Tasmanian Wilderness World Heritage Area.................................................. 15 4. The 2009 Survey ............................................................................................................................ 17 4.1 Survey area.............................................................................................................................. 17 4.2 Standard monitoring protocol ................................................................................................ 17 4.3 Statistical evaluation of standard monitoring protocol .......................................................... 17 4.4 Priority sites for survey ........................................................................................................... 22 4.5 Data collection ........................................................................................................................ 22 4.6 Field Survey Results ................................................................................................................ 24 4.7 Statistical evaluation ............................................................................................................... 25 4.8 Mapping implications .............................................................................................................. 26 4.9 Validation of CFEV data and TRCI indicators ........................................................................... 27 5. Current status of trout-free assets in the TWWHA ...................................................................... 28 5.1 Overall statistics ...................................................................................................................... 28 5.2 Region 1 .................................................................................................................................. 31 5.3 Region 2 .................................................................................................................................. 33 Status of trout-free waters in the Tasmanian Wilderness WHA 1 6. Risks of invasion of trout-free waters ........................................................................................... 50 6.1 Region 1 .................................................................................................................................. 50 6.2 Region 2 .................................................................................................................................. 55 7. Comments and Recommendations ............................................................................................... 58 7.1 Management actions .............................................................................................................. 58 7.2 Future monitoring ................................................................................................................... 60 8. References .................................................................................................................................... 61 Frontispiece: Clockwise from top left: Trout-free reach of the Lewis R; Conducting the trout- free waters survey, March 2009; a Mountain Galaxias (Galaxias truttaceus) from a SW Tasmanian TWWHA river; a Sandy (Pseudaphritis urvillii) from a south-west Tasmanian TWWHA river; a trout-free upland lake in the Franklin River catchment. Status of trout-free waters in the Tasmanian Wilderness WHA 2 Status of Trout-free Waters in the Tasmanian Wilderness World Heritage Area PE Davies, LSJ Cook, WR Robinson, T Sloane June 2009 Executive Summary A project was conducted to assess the status of trout-free waters in the Tasmanian Wilderness World Heritage Area (TWWHA) by: developing a standard monitoring protocol, using existing trout survey data, with a high level of confidence of detecting trout; undertaking a survey of trout in priority sites using the standard monitoring protocol; establishing a benchmark set of data on the abundance and distribution of trout at surveyed sites, as a basis for future monitoring of trends; gathering and mapping existing information on trout-free waters, including survey results; assessing the current status of trout-free waters of the TWWHA with regard to presence/absence and risk of infestation of trout; making recommendations for future monitoring. A brief overview of the history of introduction, impacts of brown trout on native aquatic biota and trout life history is followed by an overview of existing sources of distributional information, as well as a discussion on the value of trout-free waters. A review and update of fish distribution database and mapping resources was undertaken, with input from a variety of sources. A detailed description of the trout-free status of all key areas within the TWWWH is provided. The status of trout-free waters across the TWWHA is presented in map form and discussed in detail, focussing on key areas known to be trout-free, based on a variety of information sources centred on the CFEV exotic fish map. New records of trout presence in waters previously attributed as trout-free are presented. The following statistics have been derived from the most recent, updated data on distribution of trout-free waters within the TWWHA: 34% (6,300 of 18,400 km) of the total length of all stream reaches which naturally might contain fish (stream orders greater than 1) remains trout-free. Trout-free streams are smaller on average, with smaller catchment areas, stream order and greater channel slopes, than streams with trout. 49% , or 495 of 1014, of all mapped lakes in the TWWHA > 1 ha in surface area remain trout- free. Status of trout-free waters in the Tasmanian Wilderness WHA 3 24.8% of the area, or 3,721 of 15,022 ha, of all mapped lakes in the TWWHA > 1 ha in surface area remains trout-free. Data is unavailable for small lakes, tarns and ponds of surface area < 1 ha, but the proportion of tarns that are trout-free is believed to be high. Trout-free lakes tend to be substantially smaller with a mean area of 7.5 ha, than those with trout (mean area 22 ha) - for waterbodies > 1 ha in area. Only 1.8% of trout-free lakes have an area >50 ha compared with 7.7% of lakes with trout. Of the 49 lakes > 50 ha in size within the TWWHA, only 9 remain trout-free. The trout-free lakes with areas > 50 ha are as follows (in order of decreasing area): Lakes Norman, Will, Sappho, Payanna, Spicer and Jackie, Chalice Lake, Lake Picton, and the Ling Roth Lakes group. Two trout-free lakes, Lakes Ayr and Riveaux, are just below 50 ha in surface area. The largest, Lake Norman, is 188 ha in area, far smaller than the largest trout inhabited lake – Lake St Clair (2904 ha). No formal data exists on the presence of alien fish, including trout, in estuaries or tidal habitats within the TWWHA. Angler observations indicate that sea run trout occur in a number of estuaries, coastal lagoons and tidal reaches of larger rivers along the TWWHA coast including New River Lagoon, Port Davey and the estuaries/tidal reaches of Louisa River, South Cape Rivulet, the Wanderer and Lewis Rivers. There are no records of trout within Bathurst Harbour, despite netting surveys. There are no data on the extent of trout presence within wetland habitats of the TWWHA. A priority area was selected for survey in autumn 2009 – large coastal river catchments of the southwest of the TWWHA between Cape Sorell (Macquarie Harbour) and South East Cape. A standard fish sampling methodology was scoped and evaluated for riverine sites, using Tasmanian historical trout sampling data, and statistical analysis conducted to assess capture efficiency, sampling effort required and the relationship between sampling effort and probability of detection.
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