A marine algal bloom in Jervis Bay has been identified as a non-toxic group of Phytoplankton.
Shoalhaven City Council said water sampling found non-toxic Phytoplankton, which are also known as microalgae.
They are similar to terrestrial plants in that they contain chlorophyll and require sunlight in order to live and grow.
Most phytoplankton are buoyant and float in the upper part of the ocean, where sunlight penetrates the water.
Phytoplankton also require inorganic nutrients such as nitrates, phosphates, and sulfur which they convert into proteins, fats, and carbohydrates.
Council's Environmental Health staff assisted in taking water samples at Jervis Bay on December 10, following reports of an algal bloom.
The water samples were given to an independent laboratory for testing.
Shoalhaven Mayor, Amanda Findley said staff responded quickly to reports of the algal bloom due to the potential risk to public health.
"The algal bloom reported to council is appearing as a light green/ turquoise discolouration throughout the water and although it has been identified as non-toxic contact with the areas of discoloration or foam build up should be avoided as the algae may cause discomfort to sensitive water users," Cr Findley said
"In some cases, the health impacts of marine or estuarine species are largely unknown.
"Marine and estuarine blooms will often move with the wind and tides which means the bloom may present at different locations around the coastline.
"It is not known how long the bloom will be present. Algae blooms of this nature, although not common have occurred in Jervis Bay previously and will generally remain while conditions are favourable.
"Other species of algae have also been identified and the nature of the bloom can change over time."
Council staff will continue to monitor the bloom and is currently awaiting the results of further analysis which should further confirm species from samples taken offshore and report the results the public as required.
More information about algal algae blooms and red warning areas can be found on Water NSW's website or by calling 1800 999 457.