Greta Jimenez
The fishing industry is a major contributor to pollution, with a range of practices that are harmful to the environment. Overfishing, driven by high demand for seafood, has led to the depletion of fish stocks and the destruction of marine ecosystems. Unsustainable fishing methods, such as bottom trawling and the use of illegal fishing gear, have a significant impact on ocean health and water quality. In addition, the use of antibiotics, pesticides, and drugs in aquafarming can destroy marine environments and cause disease resistance in sea life. Plastic pollution from fishing gear, such as nets and longlining equipment, accounts for a large portion of the waste in our oceans, with fishing gear making up 75-86% of plastic in the Great Pacific Garbage Patch. The pollution and destruction caused by the fishing industry have led to a decline in ocean health, with scientists predicting the oceans could be dead by 2048 if current patterns of behaviour continue.
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What You'll Learn
Overfishing and illegal fishing
Overfishing is a serious global issue that threatens ocean wildlife and biodiversity. It occurs when vessels catch fish faster than stocks can replenish, and it has been increasing in recent decades. The number of overfished stocks globally has tripled in half a century, and today, one-third of the world's assessed fisheries are pushed beyond their biological limits. Overfishing significantly depletes ocean wildlife populations and is closely tied to bycatch, the capture of unwanted sea life while fishing for a specific species. This results in the needless loss of billions of fish and hundreds of thousands of sea turtles, cetaceans, and other endangered species like sharks and rays.
The demand for fish continues to increase worldwide, with fish being one of the most highly traded food commodities, fueling a $362 billion global industry. This high demand drives overexploitation and environmental degradation. As the human population grows, consumption of aquatic foods rises even faster, and climate change impacts migratory routes, causing fish to move away from traditional fishing grounds. This further exacerbates the issue of overfishing as vessels continue to catch at the same levels even though their target species have moved.
Illegal, unreported, and unregulated (IUU) fishing is a pervasive issue that worsens the problem of overfishing. IUU fishing is worth up to an estimated $23.5 billion annually and includes activities such as fishing without a license, in closed-off areas, with prohibited gear, above quotas, or fishing for prohibited species. Unreported fishing refers to misreporting or failing to report fishing activities to relevant authorities, while unregulated fishing involves operating without any governmental or international regulations.
IUU fishing moves through opaque supply chains due to a lack of traceability systems and import controls. Subsidies provided by governments to support their fishing industries are another key driver of overfishing, as they can lead to an excess of fishing vessels and skewed production costs. Some fishing techniques, such as bottom trawling, blast fishing, and cyanide fishing, can cause significant habitat destruction and are illegal in many places.
To address overfishing and illegal fishing, organizations like the World Wide Fund (WWF) and the Marine Stewardship Council (MSC) are working to improve management and sustainability practices. The WWF aims to stop criminals from stealing from legal fisheries and to close borders to illegally harvested seafood. The MSC has developed the Fisheries Standard, which certifies sustainably managed fisheries and helps fishery managers and governments combat IUU fishing.
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Plastic and nylon fishing gear
The issue of ghost gear is particularly prevalent in the Great Pacific Garbage Patch, an area in the North Pacific Ocean that is one of the world's largest accumulations of floating ocean plastic. Research has shown that 75-86% of the plastic waste in this area comes from offshore fishing activity, with the majority originating from major industrialised fishing nations such as the United States, China, Japan, and Korea. These nations have a responsibility to address the problem and reduce their plastic emissions.
Ghost gear is a major threat to animal welfare and sustainability. It can lead to the indiscriminate entangling and suffocating of marine species, causing injuries or death. It also contributes to climate change by reducing the ability of marine ecosystems to sequester carbon and by directly emitting greenhouse gases during production and decomposition. The presence of ghost gear exacerbates the decline in fish and other commercial aquatic animal populations, impacting local fishing communities and costing them millions of dollars per year in lost fishing time and clean-up expenses.
To combat the problem of ghost gear, several measures have been proposed, including mandatory marking of fishing gear to prevent loss and combat illegal, unregulated, and unreported fishing. It is important to raise awareness about the issue and educate anglers and outdoor enthusiasts about the impact of plastic pollution on the health of our oceans and waterways. Some companies are taking initiatives to transition to recycled materials, eliminate single-use plastics, and contribute positively to the long-term health of fisheries.
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Antibiotics, pesticides, and drugs
Antibiotics in the water can have direct impacts on marine life, as demonstrated by a study on zebrafish larvae. Exposure to streptomycin, a common antibiotic, disrupted the normal composition of the larvae's microbiome, reducing microbial diversity and increasing early mortality. Furthermore, subclinical concentrations of streptomycin were found to increase the abundance of class 1 integrons, which are associated with the horizontal transfer of antibiotic resistance genes. This suggests that even low levels of antibiotics in the environment can contribute to the development of antibiotic resistance, posing a significant threat to aquatic ecosystems and human health.
Pesticides also pose a significant risk to fish populations. A study by David Pimentel in 2005 estimated the economic impact of pesticides on fish, valuing the loss at $10-25 million annually. Another study on carp (Cyprinus carpio) exposed to the pesticide dicamba revealed significant stress, growth, immune, and histopathological changes, indicating the potential harmful effects of pesticides on aquatic organisms, especially at higher concentrations and prolonged exposure durations.
The accumulation of antibiotics and pesticides in the environment is a pressing issue, as evidenced by a 20-day caging experiment. While the gudgeon muscles displayed low levels of antibiotics and pesticides, the highest concentration of ofloxacin was recorded at 8 ng g–1. Amoxicillin, another antibiotic, was found at a downstream site at a concentration of 7.1 μg L−1. These findings highlight the presence and potential impacts of these pollutants on aquatic life.
The use of antibiotics and pesticides in aquaculture, or aquafarming, has raised concerns about the destruction of natural habitats and ecosystems. The accumulation of pollutants and disease outbreaks in the waters can have long-term detrimental effects on the organisms residing in these environments. Furthermore, the unauthorized use of pesticides and drugs by farmers, as reported in China, increases the risk of adverse effects on consumers, including the development of drug resistance, hypersensitivity reactions, and disruption of normal intestinal flora. With nearly 50% of the fish traded internationally originating from aquaculture, ensuring the safety of aquaculture practices is crucial.
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Fish farming and waste
Fish farming, or aquaculture, has significant ecological impacts on surrounding marine life and resources. One of the main issues with fish farming is the use of wild-caught fish to feed the farmed fish. These wild-caught fish, such as anchovies, capelin, and sardines, are also food sources for predators outside the enclosures. This can disrupt the natural food webs and ecosystems, especially when farmed fish escape and interbreed with wild fish, potentially leading to reduced fitness in the offspring.
Another concern is the waste generated by fish farms. Inefficient feeding methods and excess nutrients in feed formulations can result in unnecessary waste production. However, fish farms are increasingly adopting circular economy practices to reduce waste and create sustainable and economically viable operations. One approach is to recycle fish by-products and waste into valuable resources. For example, fish waste can be processed and transformed into organic fertilizers, aquaculture feed, or even pharmaceuticals. Through anaerobic digestion, fish waste can also be converted into biodiesel, a renewable energy source.
Regulatory bodies and research institutions are collaborating with fish farms to improve waste management practices and technologies. In Norway and the European Union, regulations are in place to ensure the safety of using fish meal in aquaculture feeds, with separate processing facilities for aquaculture waste and "open sea" waste to minimize cross-contamination. Thermal processing is often employed to eliminate pathogens, with specific temperature requirements for "high-risk" offal.
The intensification of aquaculture, driven by increasing demand, has led to increased waste generation. This waste, if not properly managed, can have detrimental effects on the environment and threaten the sustainability of aquaculture practices. Therefore, efficient waste management systems are crucial to limiting environmental degradation and ensuring the long-term viability of the aquaculture industry.
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Climate change and ocean warming
Marine species are highly mobile, and many are moving towards the poles to find cooler waters as ocean temperatures rise. For example, Atlantic mackerel stocks have moved northward since 2007 due to rising sea temperatures, leading to disputes between coastal states over fishery resource sharing. In New England and Alaska, warming waters have pushed fish populations northward or deeper. Some fish species, such as winter skate, have adapted by adjusting their body size to suit warmer waters, while others, like summer flounder, have shifted their range northward.
Climate change impacts the physical and chemical makeup of the ocean, significantly affecting marine ecosystems. Water temperature determines which species can inhabit a particular area, and rising temperatures can lead to the loss of marine habitats and species. Ocean acidification, influenced by warming waters, impacts many animals' ability to form shells or skeletons. Low oxygen levels, exacerbated by warm temperatures, contribute to hypoxia or dead zones, further threatening marine life.
Additionally, climate change affects the timing of seasonal events, including spawning seasons, which can impact fisheries' catch sizes and revenues. Indigenous communities that rely on traditional fishing practices are particularly vulnerable to these changes. The combination of climate change and overfishing further contaminates depleted fish populations, raising concerns about food safety and neurotoxic effects on human health.
To address these challenges, it is crucial to reduce greenhouse gas emissions and protect vulnerable marine habitats. Establishing a network of ocean sanctuaries or "marine protected areas" can enhance fish populations and benefit nearby fishers. Sustainable fishing practices, such as those meeting the Marine Stewardship Council's (MSC) standards, can also help reduce carbon emissions and prepare for climate change.
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Frequently asked questions
Fishing is one of the largest contributors to the decline in ocean health and water quality. The fishing industry is responsible for over 75% of the plastic in the Great Pacific Garbage Patch, an area three times the size of France.
Fishing has a significant impact on the environment, including the destruction of marine ecosystems and wildlife, disruption of food webs, and the introduction of non-native species. It also contributes to the climate crisis by affecting the carbon storage ability of oceans.
Fishing causes pollution through the use of modern synthetic materials in fishing gear, such as ghost nets and drift nets, which do not decompose and can continue to trap and kill marine animals. Antibiotics, pesticides, and drugs used in aquafarming can also destroy marine environments and cause disease resistance in sea life.
To reduce the pollution caused by fishing, it is essential to address the use of plastic and synthetic materials in fishing gear and promote sustainable practices in the fishing industry. This includes eliminating bottom trawling, a fishing method that drags giant nets across the ocean floor, causing habitat destruction and high bycatch rates. Collaboration between governments and private sectors is also necessary to stop illegal and unsustainable fishing practices.
