THE sun is finally out, it's school holidays, and it's very tempting to go for a swim or a surf.

• REVEALED: The Northern Rivers' shark hot-spot

But it's important to be #sharksmart if you're heading into the ocean.

The NSW DPI this morning reported a tagged bull shark was detected off Lennox Point at Lennox Head, and earlier a 2.89m white shark was caught on a smart drumline off Seven Mile Beach, Lennox Head.

Just before 12.30pm, a 2.04m white shark was caught on a smart drumline at Lighthouse Beach, Ballina.

Earlier this morning, surfers were evacuated from Shelly Beach at Ballina after Surf Life Saving NSW reported a sighting of a bull shark.

• 'More sharks than we've had for a long time'

How to be shark smart

• Tell an on-duty lifesaver or lifeguard if you spot a shark near swimmers or surfers
• Don't swim too far from shore
• Don't swim with bleeding cuts or wounds
• Always swim, dive or surf with other people
• Avoid swimming and surfing when it's dark or during twilight hours
• Avoid murky water, waters with known effluents or sewage
• Avoid areas used by recreational or commercial fishers
• Avoid areas with signs of bait fish or fish feeding activity; diving seabirds are a good indicator of fish activity
• Do not rely on sightings of dolphins to indicate the absence of sharks; both often feed together on the same food
• Be aware that sharks may be present between sandbars or near steep drop offs
• Avoid swimming in canals and swimming or surfing in river/harbour mouths
• Avoid having pets in the water with you
• Do not swim/surf near or interfere with shark nets
• Consider using a personal deterrent.