Tuggerah Lake and, inset, a great white shark.

It's not a big lake but it's a bloody big shark, if it's true

Police issued a warning today after a seven-metre great white shark was reportedly netted and freed in a Central Coast lake.

A commercial fisherman reported to police that he netted the monster in waters at a popular school holiday vacation  spot at Tuggerah Lake.

The fisherman reported snaring the seven-metre shark in nets he had cast off Canton Beach, at the northern end of  the lake about 5.30am today.