The Department of Primary Industries believes a large number of dead fish washed up on Warilla Beach was the result of a "rare gear failure" of a commercial fishing boat in the area late last week.
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Fisheries officers inspected the area on Monday and found about 150 dead mullet after concerns were raised by members of the public.
The dead fish had been spotted washed up on Warilla Beach from the northern end down to the entrance to Little Lake.
It comes just days after a dead turtle weighing more than 250 kilograms was removed from the Shellharbour shoreline using lifting equipment.
It was discovered on Wednesday morning on rocks between Shellharbour North Beach and Cowrie Island.