Corindi Creek/River is actually a small coastal stream that flows into the
ocean at Red Rock.
In regards to water quality in the creek, the area is part of the coastal
plain, quite narrow at this point. It has formed as an infilled shallow
estuary and as a result has marine derived sediments. These could include
acid sulfate soils. I have forgotten the exact process of their formation
but the end result is that when they are disturbed and get into rivers, the
rivers turn blue and all the fish die. I guess if it was only a mild case,
the river might just look a little blue (possibly quite clear) and the fish
might get sick.
The other possibility is that someone's dump of banana growing chemicals
have leached into the creek with the flooding
I hope they recover. I guess you have every remedy at your finger tips.
Matthew
Ecology Research, State Forests NSW - Ph0298720182 Fx0298716941