We are independent & ad-supported. We may earn a commission for purchases made through our links.

Advertiser Disclosure

Our website is an independent, advertising-supported platform. We provide our content free of charge to our readers, and to keep it that way, we rely on revenue generated through advertisements and affiliate partnerships. This means that when you click on certain links on our site and make a purchase, we may earn a commission. Learn more.

How We Make Money

We sustain our operations through affiliate commissions and advertising. If you click on an affiliate link and make a purchase, we may receive a commission from the merchant at no additional cost to you. We also display advertisements on our website, which help generate revenue to support our work and keep our content free for readers. Our editorial team operates independently from our advertising and affiliate partnerships to ensure that our content remains unbiased and focused on providing you with the best information and recommendations based on thorough research and honest evaluations. To remain transparent, we’ve provided a list of our current affiliate partners here.

Why are Farmed Fish Considered Harmful?

Mary McMahon
Updated May 17, 2024
Our promise to you
WiseGeek is dedicated to creating trustworthy, high-quality content that always prioritizes transparency, integrity, and inclusivity above all else. Our ensure that our content creation and review process includes rigorous fact-checking, evidence-based, and continual updates to ensure accuracy and reliability.

Our Promise to you

Founded in 2002, our company has been a trusted resource for readers seeking informative and engaging content. Our dedication to quality remains unwavering—and will never change. We follow a strict editorial policy, ensuring that our content is authored by highly qualified professionals and edited by subject matter experts. This guarantees that everything we publish is objective, accurate, and trustworthy.

Over the years, we've refined our approach to cover a wide range of topics, providing readers with reliable and practical advice to enhance their knowledge and skills. That's why millions of readers turn to us each year. Join us in celebrating the joy of learning, guided by standards you can trust.

Editorial Standards

At WiseGeek, we are committed to creating content that you can trust. Our editorial process is designed to ensure that every piece of content we publish is accurate, reliable, and informative.

Our team of experienced writers and editors follows a strict set of guidelines to ensure the highest quality content. We conduct thorough research, fact-check all information, and rely on credible sources to back up our claims. Our content is reviewed by subject matter experts to ensure accuracy and clarity.

We believe in transparency and maintain editorial independence from our advertisers. Our team does not receive direct compensation from advertisers, allowing us to create unbiased content that prioritizes your interests.

Since fish is considered to be an extremely healthy and beneficial meat, many consumers are encouraged to make it a bigger part of their diet. Increased demand for fish has led to overfishing in many wild fish populations. In response, fish farms have been established, raising fish in enclosed, netted areas. Farmed fish could be seen as a sustainable response to overfishing, but unfortunately, farmed fish may not be as environmentally friendly as it appears. A worldwide debate is raging over farmed fish, making it difficult for consumers to make choices which are beneficial to fish while also including fish in their diets.

There are numerous problems with farmed fish which make them a poor dietary choice, with the exception of certain fish and seafood species. Shellfish such as oysters, for example, have been successfully farmed for decades, and oyster farming actually appears to benefit the marine environment. Certain species like tilapia, sturgeon, and catfish are farmed often farmed sustainably and in an environmentally friendly way.

However, people should avoid purchasing most other farmed fish species. The first concern is with human health. Farmed fish are fed a cheap and standardized diet. This leads to far less nutritional variation than they would receive in the wild, which creates less nutritional value, per pound, than wild fish have. The diet fed to farmed fish is also high in fat, and fat concentrates harmful toxins such as PCBs.

Fishery health is also a major concern with farmed fish. Many farmed fish are fed with fish from South American fisheries, which are rapidly becoming depleted as a result. In addition, non-native species which are farmed can escape, to the detriment of native species in the region. Farmed fish also carry disease and parasites, because they are kept in tightly packed pens. While farmed fish are loaded with antibiotics, wild fish in the region are not, and they can and do get sick.

The marine environment is also heavily impacted by farmed fish. Most fish are relatively inefficient eaters, dropping most of their food to the ocean floor and only digesting a small percentage of what they eat. When fish are kept in a fixed environment, this leads to eutrophication, a concentrated increase in nutrients which ultimately leads to a dead zone. Farmed fish also create other types of pollution, which can be difficult to eliminate, even after the farmed fish are removed from the region.

Seeking out wild caught fish such as albacore, yellowfin tuna, anchovies, bluefish, Pacific cod, crayfish, halibut, sardines, hoki, mahi-mahi, and mackerel is a great way to support sustainable fisheries and fishing practices. Fish such as grouper, orange roughy, Chilean seabass, sharks, bluefin tuna, swordfish, and trawled or dredged species should always be avoided, as many of these fisheries are severely depleted. Trawling and dredging are also very bad for the marine environment. Lobster, crab, sole, and snapper are all considered acceptable to eat, although the fisheries are at risk, and consumers may want to avoid them.

WiseGeek is dedicated to providing accurate and trustworthy information. We carefully select reputable sources and employ a rigorous fact-checking process to maintain the highest standards. To learn more about our commitment to accuracy, read our editorial process.
Mary McMahon
By Mary McMahon

Ever since she began contributing to the site several years ago, Mary has embraced the exciting challenge of being a WiseGeek researcher and writer. Mary has a liberal arts degree from Goddard College and spends her free time reading, cooking, and exploring the great outdoors.

Discussion Comments

By sputnik — On Aug 23, 2008

Anon17052 - No, I think PCB is right here.

PCP or phencyclidine is a white powder that has a mind altering effect. Initially, it was developed as an anesthetic but that practice was stopped because of it's hallucinogenic effects. Still some continued to consume it illegally.

PCBs or polychlorinated biphenyls are chemicals used in industry. In particular, they were ideal for insulating and cooling. In the US and some other countries, PCBs were banned from being imported and produced because of their toxicity. These chemicals have leaked into the environment and caused damage. They are found in soil, air, water, and food.

By anon17052 — On Aug 21, 2008

Surely you mean "harmful toxins such as PCP's - NOT PCB's

Mary McMahon

Mary McMahon

Ever since she began contributing to the site several years ago, Mary has embraced the exciting challenge of being a...

Learn more
WiseGeek, in your inbox

Our latest articles, guides, and more, delivered daily.

WiseGeek, in your inbox

Our latest articles, guides, and more, delivered daily.