Omar Khalid
Plastic waste is a significant environmental problem, with an estimated eight million tonnes of plastic ending up in the sea each year. This plastic breaks down into tiny pieces, known as microplastics, which are ingested by fish and other marine life. The ingestion of plastic by fish is a growing problem, with studies finding plastic in the stomachs of various fish species, including commercial fish such as cod, haddock, and mackerel. While the exact harm caused by plastic ingestion is still unknown, it has been shown to reduce the appetite and growth rates of fish, which can impact reproduction and population size. With billions of people relying on seafood for sustenance, the presence of plastic in fish has raised concerns about the potential risks to human health.
| Characteristics | Values |
|---|---|
| Percentage of fish with ingested plastics | Between 2.6% and 36.5% depending on the area and methods used for counting and extracting plastic |
| Plastic ingestion by fish first recorded | 1970s |
| Number of fish species reported to ingest plastic | At least 92 |
| Types of fish that ingest plastic | Predatory fish, such as bigeye tuna, and filter-feeders, such as herring and horse mackerel |
| Dominant material of plastic ingested by fish | Polyamide and polyethylene |
| Plastic ingestion by fish in the Baltic Sea area | Limited information |
| Plastic ingestion by larval fish | More vulnerable to microplastics |
| Effect of plastic ingestion on fish | Reduces appetite and growth rates, which could impact reproduction and population size |
| Microplastics in fish fillets and livers | Present in 74% of fillets and 63% of livers |
| Plastic consumption by fish | Widespread and increasing |
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What You'll Learn
- Plastic ingestion by fish has been a problem since the 1970s
- Microplastics are found in all aquatic compartments
- The rate of plastic consumption by fish has doubled in the last decade
- Fish are a good species to track plastic pollution through marine ecosystems
- The effects of microplastics on human health are not yet fully understood
Plastic ingestion by fish has been a problem since the 1970s
Plastic ingestion by fish has been a problem for decades. The first records of plastic ingestion by fish date back to the 1970s when fish were observed consuming opaque polystyrene plastic spherules in the coastal waters of southern New England, US. Since then, at least 92 fish species have been reported to ingest plastic.
Plastic ingestion can occur both intentionally and unintentionally. Some predatory fish might mistake plastic for food, while filter-feeders might ingest plastic unintentionally while feeding. The ingestion of plastic has been observed in both predatory fish, such as bigeye tuna in the central North Atlantic, and filter-feeders, such as herring and horse mackerel in the North Sea and English Channel.
The percentage of fish that have ingested plastics varies between 2.6 and 36.5%, depending on the area and the methods used for counting and extracting plastic from the gastrointestinal tract. Microplastics, which range in size from 5mm to 10 nanometres, are more commonly ingested by fish due to their small size. In the North Atlantic, 94% of the ingested plastic particles were microplastics, while in the North Sea, the percentage of microplastics was 74%.
The problem of plastic ingestion by fish is not limited to a specific region but is widespread. Fish in heavily polluted East Asian waters, for example, showed the highest levels of plastic ingestion. This is a significant concern as seafood from this region feeds around 2 billion people.
The consumption of plastic by marine animals, including fish, is an increasingly pervasive problem. While the exact mechanisms that lead to plastic consumption are still being studied, it is believed that fish may confuse litter for prey. As plastic production levels continue to increase, marine pollution and plastic ingestion by fish are also likely to increase.
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Microplastics are found in all aquatic compartments
The presence of microplastics in aquatic compartments is a growing environmental concern. These tiny plastic particles, often resulting from the degradation of larger plastic debris, have been detected in all aquatic compartments, including freshwater, marine, and atmospheric environments. Their small size, ranging from 5mm to 10 nanometres, allows them to be easily ingested by a wide range of organisms, including fish.
The first records of plastic ingestion by fish were observed in the 1970s, when fish were seen consuming opaque polystyrene plastic spherules in the coastal waters of southern New England. Since then, at least 92 fish species have been reported to ingest plastic. This ingestion can occur both intentionally and unintentionally. Some predatory fish may mistake plastic for food, while filter-feeders can unintentionally ingest microplastics while feeding. For example, zooplankton, a crucial part of the food chain, has been observed consuming microplastics.
The percentage of fish that have ingested plastics varies between 2.6 and 36.5%, depending on the area and the methods used for detection and extraction. Microplastics are more commonly ingested due to their small size, but in some areas, fish are also attracted to larger macroplastics. Laboratory and field studies have confirmed the ingestion of microplastics by fish species of commercial interest to humans, raising concerns about potential health risks.
The presence of microplastics in aquatic compartments can have detrimental effects on the environment and aquatic life. They can accumulate in aquatic sediments, altering sediment composition and affecting nutrient cycling, with potential consequences for the entire ecosystem. Additionally, microplastics can act as substrates for microbial communities, and their ingestion by aquatic organisms can lead to chemical leakages if additives are present. While the specific risks associated with microplastics in bottled drinking water and fishery products are still being studied, the widespread presence of microplastics in aquatic compartments underscores the urgent need for effective mitigation strategies to safeguard the health and sustainability of aquatic ecosystems.
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The rate of plastic consumption by fish has doubled in the last decade
Plastic ingestion by fish is a growing problem. The rate of plastic consumption by fish has doubled in the last decade, increasing by 2.4% every year. This issue is driven by improved detection methodologies and an increase in the number of fish consuming plastic.
The first records of plastic ingestion in fish date back to the 1970s when fish were observed consuming opaque polystyrene plastic spherules in the coastal waters of southern New England, US. Since then, at least 92 fish species have been reported to ingest plastic. Plastic ingestion can occur both intentionally and unintentionally, depending on the foraging strategy of the animal. Some predatory fish might mistake plastic for food, while filter-feeders might unintentionally ingest plastic while feeding.
The incidence rate of plastic ingested by fish was 26%, and this rate has doubled in the past decade. The increase is due in part to improved sampling methods, but this is not enough to account for such a dramatic rise. As more plastic ends up in the oceans, more fish are consuming it.
The impact of plastic ingestion by fish on human health is currently unclear. While the innards of large fish tend to be discarded before being consumed, micro and nanoplastics could transfer from the gut to muscle tissues and elsewhere, eventually being consumed by humans. However, humans likely take in more plastic by breathing in dust or chewing on pen caps than through seafood consumption.
The formation of a stewardship council for plastics is one proposed solution to this problem. Such a council would connect industries from manufacturing to recycling and accredit responsible practices.
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Fish are a good species to track plastic pollution through marine ecosystems
Fish are an excellent species for tracking plastic pollution in marine ecosystems. The presence of plastic in the oceans is a significant environmental issue, with plastic waste reaching even the deepest parts of the ocean and the most remote, uninhabited islands. It has been estimated that up to 13 million metric tons of plastic enter the ocean each year, threatening marine life and ecosystems.
Fish are affected by plastic pollution in various ways. They can become entangled in plastic debris, which can lead to injury or death, as seen in the case of the endangered Steller sea lion. Additionally, fish are susceptible to ingesting plastic, which can cause intestinal injuries and even death. The first records of plastic ingestion in fish date back to the 1970s, and since then, at least 92 fish species have been reported to ingest plastic. This ingestion can occur both intentionally and unintentionally. Some predatory fish might mistake plastic for food, while filter-feeders like herring and horse mackerel can unintentionally ingest plastic while feeding.
The dominant type of plastic ingested by fish varies depending on the location. For example, studies have found that fish collected from Indonesia had primarily ingested particulate plastic, while those from the United States had ingested fibrous litter. The percentage of fish that have ingested plastics ranges from 2.6% to 36.5%, depending on the area and the methods used for counting and extracting plastic from their gastrointestinal tracts. Microplastics, ranging in size from 5mm to 10 nanometres, are more commonly ingested by fish due to their small size and abundance in the marine environment.
Fish are an important part of the food chain, and their consumption of plastic has direct implications for other marine species and humans. As larger fish and marine mammals consume plastic-contaminated fish, plastic is transferred up the food chain. Humans are also affected, as we consume both seafood containing plastic and seafood that has ingested microplastics. While the health risks of ingesting microplastics are still being studied, it is clear that plastic pollution in marine ecosystems is a pressing issue that requires urgent attention to protect the health of marine life and humans alike.
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The effects of microplastics on human health are not yet fully understood
Fish and other aquatic organisms ingest microplastics, which then enter the human food chain. While the presence of microplastics in fish and other seafood products is well-established, the effects of microplastics on human health are not yet fully understood.
Microplastics are synthetic polymer compounds that form when large plastic materials are fragmented into pieces smaller than 5mm. They are considered an omnipresent contaminant, found in all aquatic compartments, and are therefore consumed by humans through the ingestion of fishery products. The main route of human exposure is oral intake, but inhalation and skin contact are also common ways that humans are exposed to microplastics.
The toxic effects of microplastics have been observed in experimental models, such as cells, organoids, and animals. These effects include oxidative stress, DNA damage, organ dysfunction, metabolic disorder, immune response, neurotoxicity, and reproductive and developmental toxicity. However, there is a lack of systematic research on the absorption, metabolism, migration, transformation, and accumulation of microplastics in humans. The potential toxic effects and health hazards of microplastics are complex and depend on various factors, including the type, size, shape, and concentration of microplastics, as well as the duration and route of exposure.
While the overall risks to human health from ingesting microplastics in fishery products are currently believed to be low, the potential for adverse health effects cannot be ruled out. The presence of microplastics in the environment will inevitably increase due to the continued production of plastic and the degradation of existing plastic. Therefore, further research is urgently needed to understand the potential risks to human health and to develop methods for detecting and quantifying microplastics in the environment and in food sources.
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Frequently asked questions
No, but plastic ingestion has been observed in a growing number of fish species each year.
Fish can ingest plastic both intentionally and accidentally. Some predatory fish might mistake plastic for food, while filter-feeders might ingest them unintentionally while feeding.
The dominant type of plastic found in fish varies depending on the location. However, polyamide and polyethylene are commonly found in fish.
Plastic ingestion has been found to reduce the appetite and growth rates of fish, which could affect reproduction and population size.
The data on the risks of consuming fish with plastic is still incomplete, but it is believed that the overall risk to human health is low. However, further studies are needed to fully understand the potential risks.
