On 20 January 2012, hundreds of dead carp were found in the wetlands upstream of Edwardes Lake in Reservoir (Edwardes Lake is on Edgars Creek, a major tributary of the Merri.) A large influx of organic matter used up oxygen in the water, causing it to turn black and smelly, leading to the death of aquatic life. Darebin City Council liased with Yarra Valley Water to pump some of the black water to sewage.
Blue Green algae bloom
Some weeks later a Blue Green algae bloom arose in Edwards Lake and this has been managed by council with advice from Melbourne Water. However, Melbourne Water tested the water quality downstream of the Lake found on Friday 24 February that the bloom has progressed downstream at least as far as Henty St. Reservoir (Melway 18 C6). Signage will be erected along the waterway at major public access points through to the confluence with Merri Creek.
See a web version of these fabulous panels which celebrate the outstanding community achievement since 1975 in transforming Merri Creek from a weed-smothered drain to a much-loved waterway running through a bushland corridor: 
Merri Creek Management Committee. 2 Lee St, East Brunswick, Victoria, Australia 3057