Contamination of seafood occurs in two ways. Naturally and Artificially

Naturally: Various species of algae can produce marine toxins under certain circumstances. These toxins can then accumulate in shellfish such as mussels, oysters and scallops. When these contaminated shellfish species are consumed severe intoxication can occur. The different types of syndromes that can occur after consumption of contaminated shellfish, the corresponding toxins and relevant legislation are discussed in this review. Amnesic Shellfish Poisoning (ASP), Paralytic Shellfish Poisoning (PSP), Diarrheic Shellfish Poisoning (DSP) and Azaspiracid Shellfish Poisoning (AZP) occur worldwide, Neurologic Shellfish Poisoning (NSP) is mainly limited to the USA and New Zealand while the toxins causing DSP and AZP occur most frequently in Europe.

Artificially: Ocean pollution is widespread and getting worse, and when toxins in the oceans make landfall they imperil the health and well-being of more than 3 billion people, according to a new report by an international coalition of scientists led by Boston College’s Global Observatory on Pollution on Health and the Centre Scientifique de Monaco, supported by the Prince Albert II of Monaco Foundation.

Atop the proposals to remediate ocean pollution, the researchers recommend:banning coal combustion and the production of single-use plastics, controlling coastal pollution, and expanding marine protected areas.

The study is the first comprehensive examination of the impacts of ocean pollution on human health. It was published in the online edition of the Annals of Global Health and released at the Monaco International Symposium on Human Health & the Ocean in a Changing World, convened in Monaco and online by the Prince Albert II de Monaco Foundation, the Centre Scientifique de Monaco and Boston College.

“Simply put: Ocean pollution is a major global problem, it is growing, and it directly affects human health,” said Professor Philip Landrigan, M.D., the director of the observatory and of BC’s Global Public Health and the Common Good Program. “People have heard about plastic pollution in the oceans, but that is only part of it. Research shows the oceans are being fouled by a complex stew of toxins including mercury, pesticides, industrial chemicals, petroleum wastes, agricultural runoff, and manufactured chemicals embedded in plastic. These toxic materials in the ocean get into people, mainly by eating contaminated seafood."

Landrigan noted that, “We are all at risk, but the people most seriously affected are people in coastal fishing communities, people on small island nations, indigenous populations and people in the high Arctic. The very survival of these vulnerable populations depends on the health of the seas.”

The oceans cover more than 70 percent of the earth’s surface. Despite their vast size, the seas are under threat, primarily as a result of human activity, according to the findings, drawn from 584 scientific reports, which detail:

Pollution of the oceans by plastics, toxic metals, manufactured chemicals, pesticides, sewage, and agricultural runoff is killing and contaminating the fish that feed 3 billion people.

Coastal pollution spreads life-threatening infections.

Oil spills and chemical wastes threaten the microorganisms in the seas that provide much of the world’s oxygen supply. 

Prince Albert of Monaco said that the analysis can be used to mobilize global resolve to curb ocean pollution.

“The link between ocean pollution and human health has, for a long time, given rise to very few studies,” Prince Albert wrote in an introduction to the report. “Taking into account the effects of ocean pollution – due to plastic, water and industrial waste, chemicals, hydrocarbons, to name a few – on human health should mean that this threat must be permanently included in the international scientific activity.

Mercury pollution has become widespread in the oceans, accumulating to high levels in predator fish and once in the food chain poses documented risks to infants, children and adults.

Coal is the major source of mercury pollution, its toxins vaporizing into the air as it burns and eventually washing into the oceans.Pollution along the coasts by industrial waste, agricultural runoff, pesticides, and human sewage has increased the frequency of Harmful Algal Blooms (HABs) producing toxins associated with dementia, amnesia, neurological damage, and rapid death.

Plastic waste – entering the oceans at a rate of more than 10 million tons each year – kills seabirds and fish and is consumed by humans in the form of toxic microscopic particles, now found in all humans.

The waters most seriously impacted by ocean pollution are the Mediterranean Sea, the Baltic Sea, and Asian rivers.

“The key thing to realize about ocean pollution is that, like all forms of pollution, it can be prevented using laws, policies, technology, and enforcement actions that target the most important pollution sources,” said Landrigan. “Many countries have used these tools and have successfully cleaned fouled harbors, rejuvenated estuaries, and restored coral reefs. The results have been increased tourism, restored fisheries, improved human health, and economic growth. These benefits will last for centuries" I want to note that toxic pollution can cause hormonal changes, aggressiveness, emotionality in people. Yes! The saying "man is a part of nature" is true. Whatever we do to nature is like a boomerang will come back to us