"This will most certainly have been caused by the huge dead zone off that coastline," expert Ian Hendy told Newsweek.
The electric-blue algae is lighting up the California coast, from San Diego to Orange County.
Portland residents could be at risk of a rash or vomiting if they ingest or touch the algae, says Oregon Health Authority.
The bloom grew to cover nearly 60 percent of the surface of Lake Okeechobee, Florida's largest freshwater lake.
The 2-year-old dog died from algal toxins without even entering the water.
As global water temperatures increase, so do algal blooms, which can prove a hazard to marine life.
The massive 5,000-mile blob of sargassum seaweed may be crawling with deadly Vibrio bacteria, scientists have found.
It's not the first time toxic blue green algae has caused issues in Lake Okeechobee, a state of emergency having been declared in 2018.
The enormous mat of sargassum seaweed is thought to span 5,000 miles and weigh about 13 million tons.
Red tides, which are caused by blooms of algae species Karenia brevis, can release neurotoxins into the air and lead to eye and respiratory irritation.
Red tides, which are massive algal blooms, can block sunlight from reaching the sea floor and release toxins into the water and air.
While the cause for the thousands of dead fish is unclear, a red tide algal bloom has been reported on a separate beach just miles away.
The fish including bony bream, Murray cod, golden perch, silver perch and carp are thought to have died due to low oxygen levels.
The red tide is caused by blooms of algae, which produce dangerous chemicals known as brevetoxins that can kill marine life and harm humans.
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The competition, which gets participants to detect and evaluate algal blooms in satellite images, offers cash prizes of up to $12,000.
The seals are thought to have been exposed to domoic acid after a red tide algal bloom, which can cause brain or heart damage.
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The lice feed on algae growing on the skin of the whales, as well as skin flakes and open wounds.
The marine organism has been described as an untapped protein source that would be much more environmentally friendly than meat.
Algal blooms produce toxins and use up all the oxygen in the water, poisoning and suffocating other marine life.
"My breathing was slowing down and I thought I was going to die," said a New Zealand woman after suffering paralytic shellfish poisoning.
Texas officials shared a warning about toxic algae and advice about what to do if people come across it.
The rare white bioluminescent glow, known as milky seas, had never been caught on camera before.
Newsweek spoke with hikers who were planning to skip a section of the Pacific Crest Trail because of drinking water possibly contaminated with an algal bloom.