A spectacular natural phenomenon is turning the waters off Port Lincoln neon blue.

The fluorescent display is the result of bioluminescent algae and happens when the single-celled algae are disturbed by movement, causing them to light up.

Night swins have been given a spectacular glow off the SA coast. (9NEWS) (9NEWS)

Locals are making the most of the 'sea sparkles'. (9NEWS) (9NEWS)

The glow in the dark algae is often referred to as sea sparkles and can be found along the West Coast of South Australia’s Eyre Peninsula.

However, it is more common in countries with tropical climates, as the algae needs warm waters to thrive.

Locals made the most of the rare and beautiful sight by the Port Lincoln jetty last night, some braving the cold and jumping in wearing wetsuits.

Others enjoyed the light show by skimming rocks from the shore.

Others enjoyed the sight of the blue neon glow from the shore. (9NEWS) (9NEWS)

The algae is not toxic to humans. (9NEWS) (9NEWS)

The stunning display is best seen in total darkness because, during the day, the bioluminescent organisms appear as a soft pink haze on the surface of the water.