29 fines of up to $500 issued in crackdown on unsafe and anti-social behaviour on Botany Bay, Georges River and Port Hacking

The most common offences were speeding, not carrying correct safety equipment and not wearing a lifejacket when boating alone.

NSW Maritime boating safety officers, on jet-skis and patrol boats, carried out 368 inspections.

In addition to fines, 21 official cautions were issued.

Penalties include:

The operation, called Tow the Line, was also conducted on other waterways in Sydney and the Central Coast.

"This year, we have witnessed an increase in boating traffic within these particular areas which has resulted in community concerns about speed, on-water behaviour and noise," NSW Maritime executive director Mark Hutchings said.

"Water-skiing, wakeboarding and jet-skiing are all fun activities but they often have impacts on other boaters or people on the shoreline if enough care is not taken.

"The majority of people who head out on our waterways do the right thing and follow the boating rules which exist to keep us all safe, including lifejacket and licensing rules.

"For example, anyone being towed or riding a jet-ski must wear a lifejacket.

"Anyone riding a jet-ski must be the holder of a specific personal watercraft Licence and the driver of a boat towing a waterskiier or wakeboarder must hold a general boat Licence if travelling at more than 10 knots.

"Additionally, there must always be an observer facing the person being towed at all times and the observer must hold a boat or PWC driving licence or be 16 years of age or older. Towing activity involving more than three people is not permitted."

More information on safe towing and PWC use.