Alaska health officials issued an alert after wild shellfish from Kachemak Bay’s inner bay tested above regulatory limits for paralytic shellfish poisoning toxins. Residents are warned not to harvest or eat untested wild shellfish; monitoring and test results are being posted by the Alaska Harmful Algal Bloom Network.

A persistent heatwave in Finland is fueling dense blue-green algae blooms in the Baltic Sea’s Gulf of Finland and Archipelago Sea, with freshwater sightings remaining stable.

Sustained high temperatures have led to algal blooms at several sites in the Haparanda Archipelago, and local authorities are advising people to avoid bathing.

A blue-green algae bloom detected at Lower Thetis Lake’s main beach prompted a Capital Regional District health advisory on July 20, 2025, warning humans and pets to avoid the water.

An algal bloom was detected at the municipal Lulsundet beach in Luleå on July 15, prompting warning signs and questions from residents about potential health and safety risks.

Observers from a small plane reported unusual green color in lakes and ponds, raising concerns about lake health and the potential for invasive species.

The Kachemak Bay National Estuarine Research Reserve detected Pseudo-nitzschia at bloom levels in Kachemak Bay starting July 4. This diatom can produce the toxin domoic acid, associated with amnesic shellfish poisoning, though toxin production is not yet confirmed. Observed bird deaths and marine mammal strandings have spurred collection of mussel samples for lab testing.

An algal bloom in Northern Norway dominated by Chrysochromulina and Phaeocystis has caused massive fish die-offs in recent weeks, with up to one million farmed fish reported dead around Astafjorden.

A bloom of non-toxic Noctiluca algae is lining Saanich Inlet’s shoreline; safe for swimmers and shellfish consumption so far. Scientists say the bloom is not producing toxins yet, but could as the water gets warmer. “This one is a bit early!” said Galbraith.

Domoic acid poisoning is stranding marine mammals as warnings are issued to beachgoers of the threat posed by animals that are transformed by their illness.

The N.W.T.'s Department of Environment and Climate Change and the Canadian Coast Guard tested samples from various locations in the area. The results showed no toxins present.

A die-off last year at St. Paul Island, the first compelling case of fatal saxitoxin poisoning in marine mammals, comes as more harmful algae is found farther north

Testing confirmed widespread exposure of saxitoxin in marine mammals and other wildlife. In the study, researchers collected and analyzed data from 10 dead northern fur seals and hundreds of dead, mostly benthic, fish that washed ashore on a popular beachcombing beach on St. Paul Island in August 2024.

New Hampshire officials issued two warnings of potentially dangerous algae blooms along parts of Lake Winnipesaukee, the state’s largest lake. The New Hampshire Department of Environmental Services said on Thursday it detected high...

Meech Lake beach is closed due to a potentially harmful blue-green algae bloom, alongside a fire ban affecting Gatineau Park areas.

An unusually large Noctiluca bloom in Kasaan Bay. Noctiluca scintillans is a non-toxic algae bloom, generally considered harmless to humans.

High concentrations of harmful algae called Alexandrium catenella have been detected in the Bering Strait waters near St. Lawrence Island, Wales, and Little Diomede, posing a potential danger to human health and urging caution when consuming certain seafood.

A blue-green algae bloom in Yellowknife Bay sparked worry for people's dogs. Here's what an aquatic quality scientist and a veterinarian have to say about it.

Blue mussels collected on 6/15/2023, were way above the FDA limit for safe consumption of 80 μg/100g.

High levels of PSP toxins have been found in razor clams in Chignik Lagoon and blue mussels in Sand Point, Alaska, making them unsafe to eat and potentially causing paralytic shellfish poisoning, with no known cure.