How Eating Fish is Killing Our Oceans

Our oceans – and their wildlife – are under threat

Tuna fish in the ocean
Image Credit: Unsplash

Eating fish and other sealife is often deemed more eco-friendly than eating meat. However, this industry has a hefty carbon footprint that is usually left out of conversations about climate change.

In 2018, three hundred endangered turtles were found dead off the coast of Oaxaca, Mexico: Victims of a discarded industrial fishing net.

This tragedy came just weeks after high concentrations of toxic algae killed hundreds of turtles, fish, crabs, manatees, and even a 26-foot whale shark along Florida’s Gulf Coast; the result of toxic leaks from factory farms that are fed into the ocean from the Mississippi River.

How is human activity impacting our oceans?

In 2018, scientists mapped marine “wilderness” areas around the world for the first time. They found that only 13 percent of the world’s oceans can be classed as “wilderness”, or as areas that haven’t been negatively impacted by activities such as fishing, pollution, and shipping.

Very few coastal areas meet the wilderness criteria and that includes coral reefs which are normally some of the most biodiverse habitats for marine life in the ocean.

Scientists found that most of the areas defined as “wilderness” fall within the Arctic, Antarctic and Pacific Island nations where human activity is more limited, but such areas are rapidly vanishing around the globe.

Image Credit: Blue Ocean Network

Scientists at the Wildlife Conservation Society have declared that fishing, as well as run-off waste and chemicals from industrial farms, are the two most significant ways in which humans are negatively impacting ocean ecosystems.

These harmful activities coupled with the influx of plastic pollution (46 percent of which comes from fishing nets) are disrupting ocean life and, in turn, depleting ocean resources.

Unless humanity stops contributing to the leading causes of ocean pollution, disrupted ecosystems, and declining oceanic populations, then we simply won’t be able to save our oceans.

Modern fishing methods

Despite common beliefs, fish farming is inherently cruel and causes suffering to trillions of fish and other sealife.

An estimated 2.7 trillion fish are trawled from the ocean each year. For every 10 tuna, sharks and other large predatory fish that were in our oceans 50 to 100 years ago, only one is now left due to intense farming and fishing methods.

If we continue fishing with these methods, scientists predict the total collapse of all fish species in less than 50 years.

Almost all of the fish and seafood we eat comes to us by way of longlining, beam or bottom trawling where enormous nets are dragged along the sea floor picking up anything and everything in their path.

Longlining — a technique that consists of baiting thousands of hooks along fishing lines up to one-hundred miles long — snag thousands of creatures in a similarly indiscriminate fashion.

Whilst subjecting fish to a slow and distressing death, usually by suffocation, the indiscriminative nature of modern fishing techniques means that hundreds of other species are also killed in the process.

Image Credit: Jordi Chias

These unwanted species, referred to in the industry as “bycatch”, often include turtles, sharks, and dolphins, many of which are endangered. Every year, commercial fishing kills around 100 million sharks and as many as 300,000 whales, dolphins, and porpoises as bycatch.

Yet humans do not need to eat fish or contribute to the horrors of fish farming. We can get all the nutrients we need, including omega-3, from plant-based sources. There are also plenty of vegan fish alternatives in supermarkets, meaning we can enjoy our favourite seafood dishes without harming the oceans.

Behaviours can change

Meat consumption has a huge impact on our oceans as well because run-off animal waste and fertilisers from industrial farms pollute our rivers and, subsequently, our coastal waters.

The Environmental Protection Agency (EPA) reports that more than half of all US rivers are now unsuitable for aquatic life; largely due to nutrient pollution from industrial farming practices.

The Mississippi River which, at 2,320 miles long, is the main drainage system on the North American continent, carries significant amounts of fertilizer, organic nitrogen, and phosphorous manure leaks from factory farms down into the Gulf of Mexico, creating the largest hypoxic zone (ocean Dead Zone) in the world. Fluorescent green algae blooms have appeared in the water off the South Coast of America as a result.

Dead Zones are areas of the ocean that would normally be teeming with life but, due to pollution, most marine life has either died or left the area.

The Dead Zone in the Gulf of Mexico currently spans over 8,750 square miles, an area of water greater than that affected by the BP oil spill – “the worst environmental disaster in US history.”

Image Credit: National Ocean Service (NOAA)

There was a time when we didn’t think twice about our excessive use of plastic bags, straws, and bottles, but gradually we’re beginning to see these products as harmful and unnecessary.

As a society we’re making a more conscious effort to both recycle and to move away from single-use plastics. We now need to start thinking about fish and meat in the same way.

Check out our Choose Fish-Free campaign to learn more about the impact of fishing and how to find seafood alternatives.

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