Let Them Eat Carp: Fish Farms Are Helping to Fight Hunger
By Ben Belton, Dave Little and Simon Bush
Over the past three decades, the global aquaculture industry has risen from obscurity to become a critical source of food for millions of people. In 1990, only 13 percent of world seafood consumption was farmed; by 2014, aquaculture was providing more than half of the fish consumed directly by human beings.
The boom has made farmed fish like shrimp, tilapia and pangasius catfish—imported from countries such as Thailand, China and Vietnam—an increasingly common sight in European and North American supermarkets. As a result, much research on aquaculture has emphasized production for export.
This focus has led scholars to question whether aquaculture contributes to the food security of poorer people in producing countries. Many have concluded it does not. Meanwhile, the industry's advocates often emphasize the potential for small-scale farms, mainly growing fish for home consumption, to feed the poor. Farms of this kind are sometimes claimed to account for 70 to 80 percent of global aquaculture production.
Our research shows that both of these perspectives are wildly out of sync with current developments. In fact, the vast majority of farmed fish is consumed in the same developing countries where it is produced, and is widely accessible to poorer consumers in these markets. Most of it comes from a dynamic new class of small- and medium-scale commercial farms, the existence of which is rarely recognized. To understand the potential of aquaculture to feed the world, researchers and consumers need to appreciate how dynamic this industry is.
Farmed Fish is a Critical Food Source
Fish is a rich source of vitamins, minerals, essential fatty acids and high-quality protein. It plays a particularly important role in the diets of billions of consumers in low- and middle-income countries. Many of these people are poor, malnourished and unable to afford alternative nutrient-rich foods such as fruit, eggs and meat.
Throughout human history most of the fish people eat has been captured from oceans, rivers and lakes. But the total quantity of fish harvested from these sources peaked in the mid-1990s due to overfishing and environmental degradation. Demand for seafood has continued to increase since this time, as urbanization and average incomes have risen globally. Aquaculture is filling the gap.
Overemphasis on Exports
Academic research on aquaculture has focused predominantly on internationally traded species such as shrimp, salmon and Vietnamese pangasius. These three fish account for less than 10 percent of global farmed fish production, but are the focus of the majority of social science publications on aquaculture. This bias reflects the priorities and concerns of developed countries that fund research, as well as civil society organizations that work to promote sustainable aquaculture production through international trade.
Because they assume that this small group of internationally traded species is representative of global aquaculture, many scholars believe that fish farmed in developing nations is mainly exported to wealthy countries. The literature also suggests that fish farmers find it most profitable to grow species with a high market value, generating little benefit for poorer consumers.
Fact-Checking the Numbers
In a recent analysis of fish production and trade, we used data published by the United Nations Food and Agriculture Organization to show that the importance of global trade in farmed seafood has been vastly overstated. We analyzed farmed fish production and exports for 2011—the most recent year both sets of data were available—for the 10 most important aquaculture producing developing countries, which together account for 87 percent of global aquaculture production and half of the world's human population.
Our analysis shows that export trade from these countries is relatively insignificant. In fact, we found 89 percent of the fish farmed in these countries remain in their domestic markets.
Mobile vendor selling affordable fish in Bangladesh. Ben Belton, CC BY-ND
Aquaculture is Pro-Poor
But is this fish reaching the poor? To answer this question, we pieced together multiple sources of information on fish prices and fish consumption in these same 10 countries. A consistent pattern emerged: Where the quantity of farmed fish has grown substantially, the real price of farmed fish, adjusted for inflation, has fallen significantly, and the quantity of fish consumed by poorer consumers has grown.
For example, in Bangladesh—one of Asia's poorest countries—the farmed fish market grew by a factor of 25 in three decades to exceed two million tons in 2015. This growth caused the real price of farmed fish to drop by nine percent from 2000 to 2010, at the same time that wild fish were becoming scarcer and more expensive. Consumption of farmed fish by poorer households—who are particularly sensitive to changes in food prices—increased rapidly over this period, more than offsetting a decline in the quantity of wild fish eaten.
These trends imply that the expansion of fish farming has been good for the poor. Low-income households in the countries that we studied would eat less fish of any kind today, wild or farmed, were it not for the growth of aquaculture.
A Quiet Revolution
So who is producing this fish, and how? The "quiet revolution" in farmed fish supply has been driven neither by corporate agribusiness nor by tiny backyard farms. Rather, most of aquaculture's growth over the past three decades has come from a dynamic and increasingly sophisticated segment of small- and medium-sized commercial farms and the myriad businesses that support them by supplying inputs such as feed, logistics and other services.
Rather than focusing on producing expensive species for export markets or wealthy domestic customers, these unsung heroes have focused on growing affordable fish such as carp. Where these species are produced in large quantities, they have become affordable for huge numbers of low- and middle-income consumers close to home.
This transformation has not yet taken hold in many developing countries, particularly in Africa, where access to inexpensive fish could greatly improve food security. By learning from the example of nations where farmed fish supply has boomed, governments and aid organizations can make better targeted investments in infrastructure, institutions, policies and technologies to expand the impact of aquaculture's quiet revolution.
Reposted with permission from our media associate The Conversation.
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By Beth Ann Mayer
Since even moderate-intensity workouts offer a slew of benefits, walking is a good choice for people looking to stay healthy.
How to Rock Your Walk<p>Walking isn't just fun and healthy. It's accessible.</p><p>"Walking is cheap," says Dr. John Paul H. Rue, a sports medicine doctor at <a href="https://mdmercy.com/" target="_blank">Mercy Medical Center in Baltimore</a>. "You can do it anywhere at any time; [it] requires little to no special equipment and has many of the same cardio benefits as running or other more intense workouts."</p><p>Want to up your walking game? Try the tips below.</p>
Use Hand Weights<p>Cardio and strength training can go hand-in-hand when you add weights to your walk.</p><p>A <a href="https://journals.lww.com/acsm-msse/Fulltext/2019/03000/Associations_of_Resistance_Exercise_with.14.aspx" target="_blank">2019 study</a> found that weight training is good for your heart, and <a href="https://www.mayoclinicproceedings.org/article/S0025-6196(17)30167-2/abstract" target="_blank">research</a> shows it reduces the risk of developing a <a href="https://www.healthline.com/health/nutrition-metabolism-disorders" target="_blank">metabolic disorder</a> by 17 percent. People with metabolic disorders have a higher chance of being diagnosed with high cholesterol, high blood pressure, and diabetes.</p><p>Rue suggests not carrying weights for your entire walk.</p><p>"Hand weights can give you an added level of energy burning, but you have to be careful with these because carrying [them] over a long period of time or while walking could actually lead to some overuse injuries," he says.</p>
Make It a Circuit<p>As another option, consider doing a circuit. First, put a pair of dumbbells on your lawn or somewhere in your home. Walk around the block once, then stop and do some bicep curls and tricep lifts before walking around the block again.</p><p>Rue recommends <a href="https://www.healthline.com/health/exercise-fitness/running-with-weights" target="_blank">avoiding ankle weights</a> during cardio workouts, as they force you to use your quadriceps rather than hamstrings. They can also cause muscle imbalance, according to the <a href="https://www.health.harvard.edu/staying-healthy/wearable-weights-how-they-can-help-or-hurt" target="_blank">Harvard Health Letter</a>.</p>
Find a Fitness Trail<p>Strength training isn't limited to weights. You can get stronger by <a href="https://www.healthline.com/health/bodyweight-workout" target="_blank">simply using your body</a>.</p><p>Often found at parks, fitness trails are obstacle courses with equipment for pullups, pushups, rowing, and stretches to build upper and lower body strength.</p><p>Try searching "fitness trails near me" online, checking out your local parks and recreation website, or calling the municipal office to <a href="https://calisthenics-parks.com/" target="_blank">find one</a>.</p>
Recruit a Friend<p>People who workout together stay healthy together.</p><p><a href="https://bmcgeriatr.biomedcentral.com/articles/10.1186/s12877-017-0584-3" target="_blank">One study</a> showed that older adults who exercised with a group improved or maintained their functional health and enjoyed their lives more.</p><p>Enlist the help of a walking buddy with a regimen you aspire to have. If you don't know anyone in your area, apps like <a href="https://www.strava.com/" target="_blank">Strava</a> have social networking features so you can get support from fellow exercisers.</p>
Try Meditation<p>According to the <a href="https://www.nccih.nih.gov/research/statistics/nhis/2017" target="_blank">2017 National Health Interview Survey</a>, published by the National Institutes of Health, meditation is on the rise, and for good reason.</p><p>Researchers <a href="https://pubmed.ncbi.nlm.nih.gov/29616846/" target="_blank">found</a> that mind-body relaxation practices can regulate inflammation, <a href="https://www.healthline.com/health/biological-rhythms" target="_blank">circadian rhythms</a>, and <a href="https://www.healthline.com/health/glucose" target="_blank">glucose</a> metabolism, as well as lower <a href="https://www.healthline.com/health/high-blood-pressure-hypertension" target="_blank">blood pressure</a>.</p><p>"Any form of exercise can be turned into a meditation of some type, either by the surroundings you are walking in, like a park or trail, or by blocking out the outside world with music on your headphones," Rue says.</p><p>You can also play a podcast or download an app like <a href="https://www.headspace.com/headspace-meditation-app" target="_blank">Headspace</a> that has a library of guided meditations to practice while you walk.</p>
Do Fartlek Walks<p>Typically used in running, fartlek intervals alternate periods of increased and decreased speed. These are <a href="https://www.healthline.com/nutrition/benefits-of-hiit" target="_blank">high-intensity interval training (HIIT)</a> workouts, which allow exercisers to accomplish more in less time.</p><p><a href="https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0154075" target="_blank">One study</a> showed that 10-minute interval training improved <a href="https://www.healthline.com/health/metabolic-syndrome" target="_blank">cardiometabolic</a> health, or lowered the risk of heart disease, stroke, and diabetes, just as well as working out at a continuous pace for 50 minutes.</p><p><a href="https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0111489" target="_blank">Research</a> also shows that HIIT workouts increase muscle <a href="https://www.healthline.com/health/fast-twitch-muscles" target="_blank">oxidative</a> capacity, or the ability to use oxygen. To do a fartlek walk, try walking at an increased pace for 3 minutes, slow down for 2 minutes, and repeat.</p>
Gradually Increase Pace<p>A faster walking pace is associated with a lower risk of <a href="https://www.healthline.com/health/copd" target="_blank">chronic obstructive pulmonary disease (COPD)</a> and respiratory diseases, according to a <a href="https://pubmed.ncbi.nlm.nih.gov/30303933/" target="_blank">2019 study</a>.</p><p>Still, it's best not to go from a stroll to an Olympic-worthy power walk in a day. Instead, increase your pace gradually to prevent injury.</p><p>"Start by walking at a brisk pace for about 10 minutes per day, 3 to 5 days per week," Rue says. "Once you've done this for a few weeks, increase your time by 5 to 10 minutes per day until you get to 30 minutes."</p>
Add Stairs<p>You've likely heard that taking the stairs instead of an elevator is a way to add more movement into your daily routine. It's also a way to step up your walking. Stair climbing has been shown to <a href="https://www.sciencedirect.com/science/article/pii/S2211335519301123?via%3Dihub" target="_blank">decrease the risk of mortality</a> and can easily add a bit more challenge to your walk.</p><p>If you don't have stairs in your home, you can often find them outside a local municipal building, train station, or at a high school stadium.</p>
Is Your Walk a True Cardio Workout?<p>Not all walks are equal. A walk that's too leisurely may not provide enough burn to qualify as cardio. To see if you're getting a good workout, try to <a href="https://www.healthline.com/health/how-to-check-heart-rate" target="_blank">measure your heart rate</a> using a monitor.</p><p>"A target goal for a good walking workout heart rate is about 50 to 70 percent of your maximum heart rate," Rue says, adding that maximum heart rate is <a href="https://www.healthline.com/health/fitness-exercise/fat-burning-heart-rate" target="_blank">typically calculated</a> by 220 beats per minute minus your age.</p><p>You can also monitor how easily you can carry on a conversation while you walk to gauge your heart rate.</p><p>"If you can walk and carry on a normal conversation, that's probably a lower intensity walk," says Rue. "If you are slightly breathless but can still have a conversation, that's probably a moderate workout. If you are out of breath and can't talk normally, that's a vigorous workout."</p>
Takeaway<p>By shaking up your routine, you can add excitement to your workout and reap even more rewards than a basic walk provides. Increasing the pace and intensity of a workout will make it more effective.</p><p>Simply pick your favorite variation to add some spice to your next walk.</p>
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