bournda eec
bournda eec

Bournda Lagoon

Bournda Lagoon is also an ICOL (intermittently closing and opening lagoon). Bournda Lagoon experiences estuary mouth openings more regularly than Wallagoot Lake. It also has greater freshwater input from Sandy Beach Creek. This results in greater yearly fluctuations in salinity.

Bournda Lagoon is surrounded by melaleuca and tea tree species. Tannins leached from the large amounts of submerged and overhanging riparian vegetation have given the water a dark tea coloured appearance.

During the summer large rafts of floating macroalgae appear utilising the warm temperatures and nutrients in the water to flourish. These rafts also provide cover and habitat.

The lagoon hosts a range of aquatic species, some of which, such as Australian bass move between the lagoon and the upper fresh water reaches of Sandy Creek for spawning. Longfin and shortfin eels live in the lagoon for most of their lives before making their way thousands of kilometres north to the Coral Sea to spawn.

Mouth openings allow juvenile species from the ocean to enter the lagoon. Those species that can tolerate the wide fluctuations in salinity often grow rapidly and either remain in the lagoon or head back to the ocean during subsequent mouth openings. Shrimps, gobies and gudgeons are permanent inhabitants of the lagoon as are Black bream and mullet.

Bournda Lagoon (July 2009)

Bournda Lagoon

 

 

 

 

Algal Blooms

Check out these images of algal blooms in Bournda Lagoon

Lagoon Opening

View this quicktime movie of Bournda Lagoon opening in 2007