WATER police and Fisheries officers will target people illegally fishing for or buying abalone during a three-month operation.
From July 1, officers are targeting recreational and commercial fishers diving for abalone along the south coast, and will target areas in Sydney known for selling and consuming abalone.
Fisheries compliance director Glenn Tritton said the NSW Police marine area command, Marine Parks and NSW Food Authority officers would take part in operation Maxima.
"I urge anybody considering illegally fishing for — or buying — abalone to rethink their plans. The chances are you will get caught, so don't take the risk," Mr Tritton said.
Water police commander Detective Superintendent Mark Hutchings said a similar operation last year ended a decade-old illegal abalone trafficking syndicate.
NSW Food Authority's Peter Day warned black market abalone could pose a health threat to consumers.
"Abalone sold 'under the table' may not have been handled properly and could make you sick," Mr Day said.
Illegal activity can be reported to any Fisheries NSW office.
Details: Fisher's Watch line, 1800 043536.