Photo gallery

Updated 13 December 2016 8:03am

Mat-forming cyanobacteria growing on the riverbed

Mat-forming cyanobacteria growing on the riverbed

Close-up of a mat in earlier stages of growth

Close-up of mats - note signs of peeling off the rocks

Close-up of algal mats - some mats are starting to peel

Thick dark blue-green algal mats - some mats are starting to peel

Detached algal mats stranded/exposed at water's edge

Extensive mats of cyanobacteria on riverbed - mats are starting to detach

Detached algal mat in the riverbank

Extensive mats of cyanobacteria on riverbed - mats are starting to detach

Detached floating algal mats trapped by a dam

Closer view of detached algal mats trapped by a dam

Closer view of a floating algal 'raft' (caught against a stick)