The discovery of hundreds of dead mullet and whiting in the lake, near Cunjurong Point boat ramp, follow the lake’s closure in recent weeks.
Residents speculated dredging that did not mimic the natural flow of the waterway was to blame for the fish deaths.
The Department of Primary Industries has been contacted for comment.
The lake was dredged in early 2016, but has since closed to the ocean again. Conjola Community Association publicity officer Kristen Bird said finding the dead fish was “sad”.
“It is another natural disaster because of the condition of the lake entrance,” she said. “It looks a bit third world.
“It happened last time it was closed before they dredged it with sea rays and they all died. It is affecting the fish in the lake when the lake is closed, obviously.”
Ms Bird said the natural causeway of the lake needed to be “scoured” regularly.
“Because of various weather phenomenons, it has needed some assistance and I don’t think the assistance that has been given in recent times was correct,” she said.
“I think an ongoing scouring to help it find it’s natural causeway is the answer.
“The most recent dredging lasted about two summers, and it did give the lake a good flushing out, but it was never going to last because they went a way the lake doesn’t naturally flow. They dredged along the northern shoreline, but the lake flows more to the southern shoreline.”
Courtesy of illawarramercury.com.au