Once a shark was caught on a SMART (Shark-Management-Alert-in-Real-Time) drumline, a contractor was alerted who caught, tagged then relocated the animal 1km offshore.

All the drumlines were placed in the morning before being retrieved in the evening.

After trial began in March this year, the drumlines snagged 11 sharks at Tathra and five at Merimbula. A similar trial in Sydney hooked 14 sharks over a 90-day period.

At Tathra these were six white sharks between 150cm and 182cm long, three tiger sharks between 131cm and 168cm, as well as two bronze whalers that were 210cm and 276cm.

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The drumlines at Merimbula caught two tiger sharks 180cm and 320cm long, two bronze whalers 240cm and 268cm in length and a 258cm grey nurse shark.

In the trial the target species were white, tiger and bull sharks, although no bull sharks were caught.

Non-target species were bronze whaler and grey nurse sharks, which accounted for five of the total catch at the Far South Coast areas.

All sharks were released alive. Although on March 1, a drumline failed to set off an alert to Department of Primary Industry (DPI) contractors to let them know an animal had been caught and when contractors went to the drumline to retrieve it at the end of the day a tiger shark was found alive on the line, with it unknown how long it had been hooked for.

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Minister for Agriculture Adam Marshall said the trials helped reduce the risk of shark incidents at NSW beaches.

"The beauty of this technology is that it not only prevents shark encounters but also allows scientists to monitor the tagged sharks and learn more about their behaviour," he said.

He estimated the state's shark tagging program to be the largest in the world.

The DPI plans to analyse the results of the trials around the state before making an informed decision about next steps.