Red Tide

For the past week the sea for hundreds of kilometres along the coastline has had patches of this red algae - today it had spread almost to the horizon in parts along our coastline.
A red tide is the common name for an algal bloom involving large concentrations of red or brown-coloured micro-organisms. These can become concentrated in filter feeders such as mussels and oysters, making them poisonous to humans. Other types of shellfish, including abalone, are also affected.
People have been warned not to eat shellfish at present. I'm not sure what was being caught from the fishing boat in this image , but evidently other fish species are not harmed by this red tide.