Hundreds of fish were last week reported dead near the Perch Hole  In 2002 there were reported fish kills.

And, Robyn Moody, believes the problems with the lake’s health started when the current bridge crossing the lake and the Kenwood Drive bridge were reconstructed, narrowing the water flow under the bridges.

She says the water’s natural flow has changed.

Residents familiar with the lake and its estuaries have long suggested council should use a different strategy to ensure the lake’s health is increased.

Council’s website refers to the ‘Opening Strategy’ for Lake Cathie with the decision to manually open the lake usually triggered by the risk of flooding, poor water quality or habitat endangerment.

Mrs Moody has questioned if the habitat endangerment includes dead fish in the water. 

Port Macquarie-Hastings Council director Melissa Watkins said council have no plans to open the lake at this stage, however will continue to monitor conditions closely.

In 2011 council prepared a hydrodynamic model of the Lake Cathie and Lake Innes systems to test the scenario.

“The results suggest that widening the Kenwood Drive bridge would have had some beneficial impact on water quality between Cathie Creek and Lake Cathie, Ms Watkins said. 

“However the report also found that isolating Lake Innes would provide the greatest impact to tidal flows and water quality.

“The report also found these options would additionally pose the greatest threat to local ecology or other social or economic values through a loss of habitat, increased acidification, fish passage obstruction and destruction of marine vegetation.”

Ms Watkins said it’s unlikely the Lake Cathie and Lake Innes systems can be returned to their natural state, given the urban development that now exists around the lake.

“Council and relevant state government authorities have developed a Lake Opening Strategy that seeks to balance the many economic, social and environmental values the lake system provides to the community,” she said. 

Ms Watkins said council undertakes water quality monitoring on a monthly basis. 

“Council also took samples last Friday following the reported ‘fish kill’,” she said. 

“These results indicate that water quality indicators (including dissolved oxygen, pH) show the water quality to be generally good.”

Ms Watkins said council and state government authorities have undertaken numerous studies over many years.

“These studies are undertaken by experts in estuary systems and processes,” she said. 

“These professionals consult with locals as required.”

With the spectre of more dead fish looming over NSW, one state minister has warned against an emergency meeting of stakeholders becoming an ineffective talk-fest.

Up to a million fish are dead in the Darling River at Menindee and more are likely to perish in coming days as temperatures rise.

Despite criticism from scientists and environmental advocates who say mismanagement of water is to blame, the federal and NSW governments are adamant drought is behind the deaths.

Federal Water Minister David Littleproud has asked the Murray-Darling Basin Authority to convene a meeting of water managers and environmental water holders this week.

The federal government wants states to agree to use $5 million from Murray-Darling Basin funds for a strategy to look after native fish.

While you're with us, you can now receive updates straight to your inbox from the Port Macquarie News. To make sure you're up to date with all the news, SIGN UP HERE