Tea Gardens Senior Constable Dave Coyle said about 25 kilograms of blackfish was dumped "under the cloak of darkness" about 200 metres east of Ogden Street early on Monday, March 24.

"It is just such a terrible waste," Constable Coyle said.

He said such dumpings often occurred when commercial fishermen caught an excess that could not be sold.

Hefty fines apply for dumping fish.

Anyone with information is urged to contact Tea Gardens Police Station on 4997 0244.