Dead fish are piling up on San Francisco Bay Area shores: A toxic algae bloom is the likely cause

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Thousands of dead fish and other marine life carcasses are washing ashore in the San Francisco Bay Area, creating a foul smell. Experts point to an unprecedented “red tide” algae bloom as the mostly likely cause.

Abnormal numbers of dead crabs, bat rays, striped bass, white sturgeon and more have been spotted throughout the Bay area over the last week, officials say, notably at Oakland’s Lake Merritt. The start of the fish die-off could date back even further—as the harmful algae bloom has been spreading since late July.

The carcasses are worrying environmental scientists, as they mark a devastating loss to . Experts also fear that the impacts could worsen over the weekend’s expected heatwave, which could cause the harmful algae bloom to grow even more.

What is a red tide? Why is it killing fish?

While many algae blooms are beneficial to ocean life, a “red tide” is a —which can produce powerful, fatal toxins and/or cause a water’s oxygen to fall past levels needed for survival, the National Ocean Service notes. The Bay area’s current bloom was formed by a microorganism called Heterosigma akashiwo.

“This species is associated with massive fish kills elsewhere,” Jon Rosenfield, fishery ecologist at the environmental nonprofit San Francisco Baykeeper, told the Stockton Record, part of the U.S. TODAY Network. “It is unknown, at this point, whether the bloom is causing a drop in dissolved oxygen … or producing a toxin that kills fish, or both.”

Algae blooms are not uncommon, but Rosenfield added that the Bay Area’s current red tide is “unprecedented in its spatial extent and duration.”

“Small, short-lived algal blooms around the Bay’s margins are not uncommon. … But nothing of this scope has been reported before in the Bay-proper,” he said.

When did the Bay Area’s harmful algae bloom start?

This harmful algae bloom was first spotted in the Alameda Estuary, executive officer of San Francisco Bay Regional Water Quality Control Board Eileen White told The Associated Press. White added that the bloom has been spreading since late July.

Most end after about a week. But a triple-digit heat wave forecast for the upcoming Labor Day weekend may cause the Bay Area’s bloom to grow even more, White said. “We don’t know when it’s going to end,” she said.

White noted that treating the water for nutrients would cost billions of dollars. Water districts are currently funding studies to understand the effects of nutrients that have been present in the water since people settled in the area, she said. “The goal is to make the appropriate regulations based on sound science.”

How many fish have died?

There’s no way to know the total number of fish that have died so far, Rosenfield said, noting that people are seeing just a fraction of the affected fish wash up dead on the Bay’s shores.

Damon Tighe, a self-described citizen scientist, has been among those monitoring the fish kill in Lake Merritt. On Sunday, Tighe posted a map to show locations around the lake where fish had perished—as part of a project for naturalists, biologists and more to collect sightings on iNaturalist, a social network from the California Academy of Sciences and National Geographic Society used to share biodiversity observations worldwide.

Tighe estimates that more than 10,000 fish have died since August 28.

“I have never seen an event this bad,” he told the Stockton Record. “Everything is dying; gobies, flounders, crabs, polychaete works, shrimp, everything.”



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Dead fish are piling up on San Francisco Bay Area shores: A toxic algae bloom is the likely cause (2022, Sept

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Hexbyte Glen Cove Delivery rider deaths highlight need to make streets safer for everyone thumbnail

Hexbyte Glen Cove Delivery rider deaths highlight need to make streets safer for everyone

Hexbyte Glen Cove

Credit: Pixabay/CC0 Public Domain

Five food-delivery cyclists have died on Australian roads in the past three months, four in Sydney. Most commentary has focused on the harsh employment conditions that force people to take risks they shouldn’t have to. These problems should of course be fixed, but cycling in general is too dangerous in our cities.

We need to look not just at labour laws but at the laws that shape our streets: things like road rules, planning requirements and engineering standards. Food delivery is a compelling example because it shows cycling is the most efficient way to get around the city.

Despite the efforts of supposedly business-minded people like shock jock Alan Jones and New South Wales’ former roads minister, Duncan Gay (who infamously ripped up infrastructure including a cycleway along College Road in central Sydney and a rainbow crossing on Oxford Street in Surry Hills), businesses have worked out bikes are the best way to move around the city.

Bikes are fastest for distances up to 5km, even for beginners. For more experienced cyclists and during peak hour, bikes are faster for trips of 10km and often even more.

Cycling has wider benefits too. Swapping cars for bikes can reduce the tens of billions of dollars lost in traffic congestion, the many gigatonnes of greenhouse gas emissions and the health impacts of sedentary lifestyles. Even after accidents are taken into account, the health benefits of cycling far outweigh the costs.

Cycling can also help to improve equity and social inclusion, since the burdens of car-centric development are suffered most by people who are already vulnerable. They include the largely migrant food-delivery workforce.

Food-delivery cyclists are not the only people dying in car crashes. Worldwide, traffic accidents cause more than 1.35 million deaths every year and are the leading killer of children.

Blaming the victims

Instead of focusing on the dangers created by cars and trucks, however, NSW Transport and Roads Minister Andrew Constance this week blamed the victim:

If people are riding around, particularly at night, they have an obligation to make sure they are wearing high-visibility jackets. They’ve obviously got to have the requisite lighting in terms of the bike. They themselves should obviously be putting protective and high-vis clothes on.

Before this week, news stories about food-delivery cyclists were mostly negative. Just last month, police announced a crackdown on delivery cyclists riding on footpaths.

Fears about cyclists injuring pedestrians receive a lot of attention, yet car driving kills three times more people per kilometre than cycling. The danger created by trucks is more than ten times greater per kilometre (and vastly greater overall).

Rules give priority to cars

Of course, we have all seen cyclists doing risky things. But the issue is less about individual behaviour and more about the regulatory environment. In Sydney and many other places, a plethora of state and federal rules and regulations give priority to cars in our cities.

Planning rules entrench the dominance of cars by mandating the provision of car parking (despite its significant impact on housing affordability). Engineering standards support high-speed travel.

Road rules and policing practices also enforce the dominance of cars on streets. An example is penalising pedestrians who step onto or cross the road within 20 metres of a zebra crossing. In contrast, sanctions for are weak and poorly enforced, and cycling is left out of driver education.

Infrastructure is a problem too

Lopsided budget allocations and infrastructure make the situation worse. Even projects supposedly aimed at pedestrians and cyclists often benefit cars far more. An example is overpasses that increase walking and cycling distances, while giving cars a smooth, lights-free ride.

The challenge is particularly acute in older areas, where streets were not designed for high car use. Calls for bike lanes, widened footpaths and other infrastructure for pedestrians and cyclists are often refused on the grounds of lack of space. But why do cars get what little space there is?

The site of Sunday’s death is a clear example. The intersection where the was killed by an excavator-carrying truck is not a highway but a relatively narrow street with houses and a school. Should large trucks really be driving on streets like this?

Law reform is overdue

Internationally, there is a growing recognition that legal reform is needed to improve safety, and in turn to achieve both individual and national benefits. The Dutch approach has long been celebrated, both for the high quality of cycling infrastructure and the high level of liability for car drivers. The Swedish Vision Zero has also been influential, with cities around the world introducing laws and policies to eliminate deaths in traffic.

Even in the US, where car culture is deeply entrenched, many cities are adopting complete streets legislation. These laws require streets to be planned, designed, operated and maintained to enable safe, convenient and comfortable access for users of all ages and abilities, regardless of their transport mode.

In Australia, councils like the City of Sydney are taking very positive actions to support , but this alone is not enough. To save the lives of delivery riders—and everyone else—we need legal reforms at the state and federal levels.



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