Blue Green Algae
Blue-green algae, or cyanobacteria, are bacteria present in freshwater lakes and marine environments, like the Prospect Park Lake and other bodies of water in the NYC area. While they usually exist in low numbers, this type of algae can bloom during the summer months, which gives the water the appearance of neon blue or green paint. Certain types of cyanobacteria produce toxins, and during a bloom, ingestion or skin contact with these toxins can pose a health risk to humans and animals.
Where can dogs swim?
Where can you fish?
What to do if exposure occurs
For more about algal blooms, visit the NYC Parks website.