Maya Ellison
Plastic pollution is a pressing global crisis, with billions of pounds of plastic making up about 40% of the world's ocean surfaces. Marine animals, including mammals, birds, turtles, and fish, are adversely affected by this pollution. Fish ingest plastic, which can cause intestinal injury and death, and the plastic is transferred up the food chain to bigger fish, marine mammals, and humans who eat seafood. A recent study found plastic in the guts of a quarter of fish sold in California markets, and Stanford ecologists have shown that the rate of plastic consumption by marine fish is increasing. The problem is impacting species unevenly, with some more susceptible to eating plastic than others. The ingestion of plastic by fish is a growing concern, and it is essential to address the root causes of plastic pollution to protect the health and well-being of marine ecosystems and human populations.
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What You'll Learn
Fish ingestion of plastic is increasing
Plastic ingestion by fish is a growing problem. Over the last decade, the rate of plastic consumption has doubled, increasing by 2-2.4% every year. This increase is partly due to scientists' improved ability to detect smaller particles of plastic. However, even when controlling for this improvement, researchers still found an overall increase in plastic consumption.
A study published in the journal Global Change Biology revealed that 386 out of 555 species of marine and estuarine fish—two-thirds of all species studied—had ingested plastic. Of these, 210 were species that are commercially fished. The study also found that places with a lot of plastic in their surface waters, such as East Asia, had a higher likelihood of plastic ingestion by fish.
Another study found that a quarter of fish at markets in California contained plastic in their guts, mostly in the form of plastic microfibers. This demonstrates that fish meant for human consumption are ingesting plastic. Indeed, fishery products are known to be an important source of microplastics in the human diet.
The ingestion of plastic by fish has various negative consequences. Firstly, it can cause intestinal injury and death. Secondly, it transfers plastic up the food chain to bigger fish, marine mammals, and humans. Finally, microplastics can release chemical substances (organic and inorganic) present in their matrix or previously absorbed from the environment and act as carriers of microorganisms.
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Plastic affects fish health
A study by Stanford ecologists found that over 200 species of commercial importance are eating plastic. The problem is widespread, with plastic found in the guts of fish from markets in California and in wild fish from Lake Ontario and Lake Superior. The presence of plastic in fish guts can reduce the storage volume of the stomach, leading to starvation. Additionally, plastic can cause blockages and internal injuries, as seen in sea turtles.
The ingestion of plastic by fish also has implications for human health. Fishery products are a significant source of microplastics in the human diet. These microplastics can reach the gastrointestinal tract and cause oxidative stress, cytotoxicity, and translocation to other tissues. They can also release chemical substances and act as carriers of microorganisms. The presence of additives and toxic elements in microplastics further exacerbates the health risks.
The accumulation of plastic in the oceans is a global crisis, with deadly effects on wildlife. It is essential to address the root causes of plastic pollution and regulate plastics as pollutants to protect fish health and the broader marine ecosystem. While the immediate health impacts on fish populations are not yet noticeable, the increasing consumption of plastic is a growing concern.
Overall, plastic ingestion by fish is a significant issue that requires urgent attention. The impacts on fish health, including intestinal injuries and potential starvation, highlight the need for further research and action to mitigate the presence of plastic in our oceans.
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Plastic bioaccumulates in the food chain
Plastic waste has become a significant environmental problem, with billions of pounds of plastic in the oceans, on beaches, and in other global aquatic ecosystems. This plastic waste is ingested by marine animals, including fish, and has been shown to bioaccumulate in the food chain.
A study by Stanford ecologists found that the rate of plastic consumption by marine fish has been increasing, with the rate of consumption doubling in the last decade. The study analyzed data from 171,774 individuals of 555 species of marine and estuarine fish, finding that 386 species (two-thirds) had ingested plastic. This number is likely an underestimate, as new species of fish with plastic inside them are being discovered each year.
The likelihood of plastic ingestion by fish decreases with depth, but microplastics have been found across the world's oceans, from the surface to the ocean floor and in sea ice. In the Gulf of Mexico, for example, microplastics were found at depths of up to 5,000 feet. Small fish and crustaceans at these depths were found to have ingested more plastic than those at shallower depths. This is likely due to the plastic settling in sediments and the animals scavenging these particles along with their food.
The ingestion of plastic by fish has direct and indirect impacts on the food chain. Fish that ingest plastic can suffer intestinal injuries and even death. Additionally, the plastic can transfer up the food chain to bigger fish, marine mammals, and eventually human seafood eaters. Fishery products are known to be a significant source of microplastics in the human diet, with potential health risks associated with the ingestion of these microplastics.
The bioaccumulation of plastic in the food chain is a growing concern, and further research is needed to understand the full extent of its impact on marine ecosystems and human health.
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Plastic is pervasive in fish consumed by humans
The problem of plastic ingestion by fish is not limited to a specific region but is widespread, with coastal waters and the seas surrounding Europe well-studied. However, there is a lack of data from high-latitude seas and the Southern Ocean, despite these regions being sinks for microplastic debris due to retreating ice and developing fisheries. The pervasiveness of plastic in fish consumed by humans is a growing concern, with over 200 species of commercial importance impacted. This includes commonly consumed fish such as black sea bass, as well as species of high concern due to their threatened status and vulnerability to overfishing, such as the blue shark, Atlantic bluefin tuna, and chinook salmon.
The presence of plastic in fish consumed by humans has significant implications for human health. Fishery products are a known source of microplastics in the human diet, with plastic debris found in the guts, fillets, and livers of fish. A study of fish from California markets found that a quarter of the samples contained plastic, mainly in the form of plastic microfibers. Another study of seven species of sportfish found microplastics in all sampled tissues, including fillets and livers, indicating that plastics are not just passing through the gut but are also accumulating in other parts of the body.
The health risks associated with ingesting microplastics include oxidative stress, cytotoxicity, and the translocation of plastics to other tissues. Microplastics can also release chemical substances and act as carriers of microorganisms, including toxic elements such as polybrominated diphenyl ethers (PBDE) and bisphenol A (BPA). While the full extent of the risks is not yet fully understood, the increasing prevalence of plastic in fish consumed by humans underscores the urgency of addressing plastic pollution and its potential impact on human health.
The accumulation of plastic in the oceans is a significant contributor to the problem of plastic ingestion by fish. Plastic debris can be found in all major ocean gyres, with the Great Pacific Garbage Patch being the largest accumulation. If no changes are made to plastic production, use, and disposal, the amount of plastic entering aquatic ecosystems is expected to more than double by 2040. With billions of pounds of plastic already in the oceans, plastic pollution is a global crisis that requires urgent action to protect marine life and the health of humans who consume seafood.
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Plastic pollution is a global crisis
A recent study published in the journal Global Change Biology revealed that the rate of plastic consumption by marine fish has doubled in the last decade and is increasing by more than 2% annually. The study found that two-thirds of the 555 species of marine and estuarine fish examined had ingested plastic, with 210 of these being commercially fished species. Places with high levels of plastic in surface waters, such as East Asia, contribute to a higher likelihood of plastic ingestion by fish. However, fish type and behavior also play a role, with active predators at the top of the food chain, such as sharks, ingesting more plastic.
The consumption of plastic by fish has significant implications for both the marine ecosystem and human health. Plastic debris can cause intestinal injury and death in fish, and it can also transfer up the food chain to larger fish, marine mammals, and ultimately, human seafood eaters. Microplastics, or plastic particles smaller than 5mm, have been found in the fillets and livers of several fish species, indicating that they are not just being excreted but are traveling to other parts of the body. These microplastics can release chemical substances and act as carriers of microorganisms, posing potential risks to human health when ingested through fishery products.
The scope and severity of the plastic pollution crisis are likely underestimated, and filling in knowledge gaps is crucial to addressing the problem effectively. While some regions, such as coastal waters and the seas surrounding Europe, have been well-studied, other areas like high-latitude seas and the Southern Ocean require further research. Additionally, studying top predators will help understand how plastic bioaccumulates in the food chain and how it may be redistributed across the ocean. Addressing the root causes of plastic pollution and regulating plastics as pollutants are essential steps in mitigating this global crisis.
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Frequently asked questions
Plastic waste in the ocean is a significant environmental problem. Fish ingest plastic, which can cause intestinal injury and death. Plastic can also transfer up the food chain to bigger fish, marine mammals and humans.
Fish are more likely to eat plastic fragments, while crustaceans are more likely to eat fibres. These plastics are often covered in bacteria.
Plastic is found in the ocean from the surface to the ocean floor. In the Gulf of Mexico, plastic falls from the surface and settles in sediments on the ocean floor, up to 5,000 feet deep.
While plastic ingestion has not caused noticeable fish population problems, 35 species were listed as threatened or near-threatened, and another 26 species are vulnerable to overfishing.
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