On World Tuna Day, Let’s Fix Oversight of Tropical Species
By Rachel Hopkins
Tropical tuna species—skipjack, bigeye and yellowfin tunas—are important economic assets for coastal communities across the globe, and even far from the ocean they are a favorite on supermarket shelves and in sushi bars. These three species—together worth close to $40 billion annually at the final point of sale—prompted eight Pacific island countries to launch World Tuna Day on May 2, 2011. In 2016, the UN officially adopted the date to highlight the importance of sustainable tuna management.
Despite that designation, however, concern for the future of these fish continues. Through the increased use of fish aggregating devices (FADs)—man-made floating rafts that attract fish in the open ocean—over the past three decades, purse seine fleets have seen dramatic increases in skipjack catch. But this has come at a cost to bigeye and yellowfin populations. Because FADs attract juvenile bigeye and yellowfin in addition to skipjack, increased skipjack fishing on FADs has resulted in fewer bigeye and yellowfin surviving to adulthood, which means fewer of those species in the water for crews fishing with other gear, such as longlines and pole and line.
Further, the international bodies tasked with protecting bigeye and yellowfin fisheries also manage skipjack, and they have been reluctant to adopt measures to reduce the impact of FAD fishing on bigeye and yellowfin populations out of fear those measures would hurt the skipjack industry.
The result has essentially been a years-long stalemate, the consequences of which are being borne out around the globe, in part because managers are also debating how much to restrict fishing with purse seine nets and longlines. The population of bigeye in the Pacific, which also faces pressure from longliners catching adult fish, has been decreasing and scientists recommend against further increases in fishing mortality. Atlantic bigeye populations are already experiencing overfishing, and scientists consider both Atlantic bigeye and yellowfin to be overfished. Bigeye have just a 38 percent chance of recovery by 2028, according to an analysis based on 2016 catch levels. Yet, due to insufficient controls by international managers, catch of both Atlantic stocks exceeded the agreed quotas in 2016.
Materials that can make up FADs are piled on the deck of a purse seine vessel in Micronesia.The Pew Charitable Trusts
Urgent Changes Needed
The International Commission for the Conservation of Atlantic Tunas (ICCAT), the body responsible for managing tropical tunas in the Atlantic Ocean, is on the hook to adopt a new tropical tuna measure, including a revised recovery plan for Atlantic bigeye, at its annual meeting in November. To be successful, ICCAT's new measure must:
- Set the Atlantic bigeye quota at a level that will give the stock at least a 70 percent chance of recovery by 2028 and ensure that the total catch, from both major and minor harvesters, does not exceed the overall quota.
- Take steps to reduce juvenile Atlantic bigeye and yellowfin catch via FAD management reform, including by reducing the number of FADs that may be deployed and the amount of purse seine fishing effort allowed on tuna schools associated with FADs.
- Ensure that ICCAT managers develop a more transparent and proactive approach to management—through a modernized approach known as a "management procedure," in which managers agree in advance on the goals for a fish stock and harvesting rules to ensure the goals are met—for tropical tunas, which will return the stocks to healthy levels or keep them there, over the long term. ICCAT needs to make sufficient progress this year to meet its agreed 2020 deadline to adopt management procedures for tropical tuna stocks.
In the western and central Pacific Ocean, tropical tunas are managed by the Western and Central Pacific Fisheries Commission (WCPFC). The bigeye population there is doing better than in the Atlantic but has declined, and FADs are still proliferating at an alarming rate. WCPFC has catch limits for bigeye for the fleets of major longline harvesting nations and prohibits purse seiners from fishing on FADs for a period every year. Despite that, the purse seine fleets fishing on FADs may be catching as much as four times the number of bigeye as the longline fleets, and data suggest that a more effective way of managing the purse seine impact on bigeye would be to agree on a science-based limit on the number of times vessels can fish on FADs.
To better understand and thus regulate the level of FAD use, the Parties to the Nauru Agreement—eight countries that are members of the WCPFC and in whose waters more than 90 percent of FAD fishing in the commission's purview occurs—are using satellite technology to better track the devices. But to ensure sustainability of the bigeye/tropical tuna fisheries across the western and central Pacific, the WCPFC must:
- Take steps to ensure that the longline and purse seine catch of bigeye is within the limits advised by scientists and, in the purse seine fishery, replace the FAD closure with science-based limits on the number of times vessels can fish on the devices.
- Make progress on developing a harvest strategy for western and central Pacific bigeye in order to adopt a full strategy by 2021, with the goal of keeping the population at a sustainable level over the long term, with little risk of the stock falling into the danger zone.
This World Tuna Day, managers in the Pacific and Atlantic must take immediate action to help ensure the long-term sustainability of tropical tuna fisheries or continue to let shortsighted economic and political pressures determine their actions. Doing the right thing now would benefit the fish, and all who rely on them, far into the future.
Rachel Hopkins is acting director of The Pew Charitable Trusts' global tuna conservation campaign.
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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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