red tide
Our editors will review what you’ve submitted and determine whether to revise the article.
- Healthline - What Causes a Red Tide and is it Harmful to Humans?
- National Center for Biotechnology Information - PubMed Central - The Art of Red Tide Science
- University of Idaho - Red tide and Shellfish poisoning: Toxic products of marine algae
- Woods Hole Oceanographic Institution - Sea Grant - Red Tides
- American College of Emergency Physicians - Red Tides: The Phenomenon That Will Take Your Breath Away
- National Oceanic and Atmospheric Administration - What is a Red Tide?
- Mass.gov - Red Tide (Paralytic Shellfish Poisoning)
- LiveScience - What Causes a Red Tide?
- PBS NewsHour - Why red tide isn’t red and other myths about algae blooms
- WebMD - Red Tide: What to Know
red tide, discoloration of sea water usually caused by dinoflagellates, during periodic blooms (or population increases). Toxic substances released by these organisms into the water may be lethal to fish and other marine life. Red tides occur worldwide in warm seas. Up to 50 million cells per litre (quart) of the species Gymnodinium brevis caused a red tide off the Florida coast in 1947 and turned the water from green to yellow to amber; thousands of fishes died. A red tide along the Northumberland coast in England in 1968 was the cause of the death of many sea birds. Similar red tides, caused by Gonyaulax polyedra, have occurred off the California and Portuguese coasts. Toxins released into the water are irritating to the human respiratory system; they may become public health problems at coastal resorts when breaking waves release the toxic substances into the air.