13.2 The Wallis Lake Estuary Management Committee - Great Lakes ...

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Wallis Lake Estuary Management Plan 4.3 Fisheries F.1 Management Area A, B, C, D, E, F Management Objective Protect and enhance key fish habitat areas essential for spawning, shelter, free passage or other reasons Action No F.1.1 F.1.2 Action Implement action 10.5 of the WLCMP to facilitate free passage of fish by maintaining or constructing fishways at Locketts Crossing, Clarksons Crossing, Dargavilles Road Crossing and at the Old Butter Factory Weir at Dyers Crossing Evaluate the findings of the Manning bioregional assessment conducted by the Marine Parks Authority in consultation with NSW DPI and Department of Environment and Conservation Indicative Cost Priority Responsibilities Progress $150,000 Immediate (B1) WaLI group, CMA, GLC, GTCC, DPI, RTA, DIPNR Staff time High (A4) WLEMIC, DPI, DEC Comments Fish kills resulting from asphyxiation in the upper Wallamba River have occurred during periods of low flow in summer following algal blooms (see section 2.2.4). Action F.1.1 will reduce the risk of fish kills occurring in the future by facilitating free fish passage allowing fish to escape from anoxic waters. Reducing the nutrient load available for algal blooms (which cause the anoxic water conditions when they decompose) will also contribute to this action. The NSW Government is using a systematic approach to identify new sites for MPAs in NSW waters through a bioregional and site assessment process. The Manning bioregion (which includes Wallis Lake) was assessed during 2004 for the progressive development of the NSW representative system of MPAs. The results of this assessment may have consequences for MPAs in Wallis Lake. The protection of significant wetland areas (see E.1.1) will contribute to this strategy by safeguarding these areas from development pressure and degradation allowing them to continue to act as nursery areas for species of juvenile fish and crustaceans. 50
Wallis Lake Estuary Management Plan Dargavilles Road Crossing Clarksons Crossing Locketts Crossing [Figure 4.9: Sites of fishways to be installed (violet ladders) and site of fish kills (red fish) in the upper Wallamba River] 51
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13.2 The Wallis Lake Estuary Management Committee - Great Lakes ...

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