5 Ways Sustainable Seafood Can Benefit People and the Environment
By Emily Petsko
For many, the end of October evokes images of falling leaves or Halloween's ghosts and ghouls. But those of us focused on oceans also know October as National Seafood Month.
Oceana works to save the oceans and feed the world, and we can't do that without sustainable seafood. We help our oceans thrive by promoting fishery policies that follow science-based quotas, reduce bycatch, put an end to overfishing and protect fragile habitats. These tactics not only help marine life flourish — a win in its own right — but also ensure that our oceans can continue to nourish the people who need it most.
Seafood is an indispensable part of many people's diets, livelihoods and cultural traditions. This is especially true for populations that don't have access to an alternate source of healthy, affordable protein. In recognition of National Seafood Month, here are five ways that seafood can sustain and support communities around the world.
1. Seafood can provide a healthy source of protein to a growing population.
Right now, 821 million people around the world are living in hunger. This problem isn't likely to disappear anytime soon, especially with the population projected to grow by 2 billion people over the next 30 years. But by ensuring that fisheries are managed sustainably, and within scientifically sound parameters, we can restore ocean abundance and put enough fish in our waters to feed a sizable portion of the planet. If we look after our oceans properly and avoid overexploiting their resources, they could provide a nutritious meal every day for 1 billion people.
2. Seafood could fill the micronutrient void that exists in many developing countries.
Enough fish are caught in many developing countries to nourish their populations, and yet malnutrition remains a persistent problem. How can this be? A team of researchers, including Oceana Science Advisor Dr. Eddie Allison, found that the fish being caught in tropical countries are chock full of important micronutrients — including calcium, iron, zinc, selenium, omega-3 and vitamin A — but they don't always end up on local people's plates. That's because much of the catch is exported, sometimes for the sole purpose of being churned into fishmeal and fed to carnivorous farmed fish like salmon, which are ultimately consumed by people in higher-income countries.
This has consequences for both local people and the economy. "A lack of fish-derived nutrients has been found to have a large effect on public health, notably infant mortality and hence GDP," Oceana Board Member and fisheries scientist Dr. Daniel Pauly wrote in a response to the study, which was led by Dr. Christina Hicks. That's why, when we consider the benefits of seafood, it's important to also consider who has access to those benefits.
3. Seafood tends to be a low-carbon food, so it reduces the strain on the environment.
Compared to land-based animal proteins like beef and pork, wild-caught seafood has a significantly lower carbon footprint (as long as it's not being carted around the planet by plane). Plus, it requires virtually no fresh water or arable land to harvest it. At a time when concerns over habitat destruction and climate change are growing, it's more vital than ever to rethink our global food systems.
A recent report from the High Level Panel for A Sustainable Ocean Economy suggested that climate change could be mitigated, in part, by shifting global diets towards plant- and ocean-based options. "Food from the sea, produced using best practices, can (with some notable exceptions) have some of the lowest greenhouse gas emissions per unit of protein produced of all protein sources," the panel wrote.
4. The fishing sector provides jobs to millions of people — half of whom are women.
Women and children fish in Pemba, Mozambique. © OCEANA / Ana de la Torriente
Roughly 120 million people work in capture fisheries around the world. Over 95% of those people live in developing countries, and nearly half of them are women. Although fishing is typically viewed as a "masculine" occupation, many women make a living by spearing octopus, digging for clams, diving for abalone and packing and processing seafood. This industry is particularly important in small island nations. In Palau and Seychelles, for instance, 10% to 50% of their GDPs may be derived from fisheries, according to Forbes.
5. Fisheries are vital to many Indigenous coastal communities.
Indigenous peoples eat roughly 2 percent of all the seafood caught annually around the world, according to a 2016 study written by Dr. Andrés Cisneros-Montemayor and co-authored by Dr. Pauly. Considering that Indigenous groups comprise just 5% of the global population, their seafood consumption works out to be 15 times higher than that of non-Indigenous peoples.
So what exactly does this mean? As the study's authors put it: "Marine resources are crucial to the continued existence of coastal Indigenous peoples, and their needs must be explicitly incorporated into management policies." Canada's revamped Fisheries Act, which was championed by Oceana and our allies, is a good example of how this can be achieved. The new version of the Act recognizes Indigenous knowledge and states that the Minster of Fisheries and Oceans has a duty to consider any adverse effects that decisions may have on Indigenous peoples.
Fish at a market in Punta Gorda, Belize. © OCEANA / A. Ellis
From coastal communities to octopus fishers to people living in the tropics, it's clear that millions of people around the world depend on abundant oceans. Of course, when we talk about the benefits of seafood, sustainability is an important caveat. Overfishing and destructive fishing methods are still ravaging marine habitats, rendering them less capable of providing for people's nutritional needs in the future. That's why, when you select a fish from a restaurant or your local supermarket's seafood counter, it's important to check the source. The Monterey Bay Aquarium has a helpful tool called Seafood Watch that simplifies the process.
Want to learn more about how Oceana is helping to save the oceans and feed the world? Visit their campaign page here.
Reposted with permission from our media partner Oceana.
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By Jacob L. Steenwyk and Antonis Rokas
From the mythical minotaur to the mule, creatures created from merging two or more distinct organisms – hybrids – have played defining roles in human history and culture. However, not all hybrids are as fantastic as the minotaur or as dependable as the mule; in fact, some of them cause human diseases.
When Looking Through a Microscope Isn’t Close Enough.<p>For the last few years, <a href="http://www.rokaslab.org/" target="_blank">our team at Vanderbilt University</a>, <a href="https://www.researchgate.net/lab/Gustavo-Goldman-Lab" target="_blank">Gustavo Goldman's team at São Paulo University in Brazil</a> and many other collaborators around the world have been collecting samples of fungi from patients infected with different species of <em>Aspergillus</em> molds. One of the species we are particularly interested in is <a href="https://doi.org/10.1006/rwgn.2001.0082" target="_blank"><em>Aspergillus nidulans</em>, a relatively common and generally harmless fungus</a>. Clinical laboratories typically identify the species of <em>Aspergillus</em> causing the infection by examining cultures of the fungi under the microscope. The problem with this approach is that very closely related species of <em>Aspergillus</em> tend to look very similar in their broad morphology or physical appearance when viewing them through a microscope.</p><p>Interested in examining the varying abilities of different <em>A. nidulans</em> strains to cause disease, we decided to analyze their total genetic content, or genomes. What we saw came as a total surprise. We had not collected <em>A. nidulans</em> but <em>Aspergillus latus</em>, a close relative of <em>A. nidulans</em> and, as we were to soon find out, <a href="https://doi.org/10.1016/j.cub.2020.04.071" target="_blank">a hybrid species that evolved through the fusion of the genomes</a> of two other <em>Aspergillus</em> species: <em>Aspergillus spinulosporus</em> and an unknown close relative of <em>Aspergillus quadrilineatus</em>. Thus, we realized not only that these patients harbored infections from an entirely different species than we thought they were, but also that this species was the first ever <em>Aspergillus</em> hybrid known to cause human infections.</p>
Several Different Fungal Hybrids Cause Human Disease.<p>Hybrid fungi that can cause infections in humans are well known to occur in several different lineages of single-celled fungi known as yeasts. Notable examples include multiple different species of <a href="https://doi.org/10.1002/yea.3242" target="_blank">yeast hybrids</a> that cause the human diseases <a href="https://rarediseases.info.nih.gov/diseases/6218/cryptococcosis" target="_blank">cryptococcosis</a> and <a href="https://www.cdc.gov/fungal/diseases/candidiasis/index.html" target="_blank">candidiasis</a>. Although pathogenic yeast hybrids are well known, our discovery that the <em>A. latus</em> pathogen is a hybrid is a first for molds that cause disease in humans.</p>
(Left) Candida yeasts live on parts of the human body. Imbalance of microbes on the body can allow these yeasts, some of which are hybrids, to grow and cause infection. (Right) Cryptococcus yeasts, including ones that are hybrids, can cause life-threatening infections in primarily immunocompromised people. Centers for Disease Control and Prevention<p><a href="https://doi.org/10.1371/journal.ppat.1008315" target="_blank">Why certain <em>Aspergillus</em> species are so deadly</a> while others are harmless remains unknown. This may in part be because <a href="https://doi.org/10.1016/j.fbr.2007.02.007" target="_blank">combinations of traits, rather than individual traits</a>, underlie organisms' ability to cause disease. So why then are hybrids frequently associated with human disease? Hybrids inherit genetic material from both parents, which may result in new combinations of traits. This may make them more similar to one parent in some of their characteristics, reflect both parents in others or may differ from both in the rest. It is precisely this mix and match of traits that hybrids have inherited from their parental species that <a href="https://www.nytimes.com/2010/09/14/science/14creatures.html" target="_blank">facilitates their evolutionary success</a>, including their ability to cause disease.</p>
The Evolutionary Origin of an Aspergillus Hybrid.<p>Multiple evolutionary paths can lead to the emergence of hybrids. One path is through mating, just as the horse and donkey mate to create a mule. Another path is through the merging or fusion of genetic material from cells of different species.</p><p>It is this second path that appears to have been taken by our fungus. <em>A. latus</em> appears to have two of almost everything compared to its parental species: twice the genome size, twice the total number of genes and so on. But unlike other hybrids, which are often sterile like the mule, we found that <em>A. latus</em> is capable of reproducing both asexually and sexually.</p><p>But how distinct were the parents of <em>A. latus</em>? By comparing the parts contributed by each parent in the <em>A. latus</em> genome, we estimate that its parents are approximately 93% genetically similar, which is about as related as we humans are with lemurs. In other words, <em>A. latus</em>, an agent of infectious disease, is the fungal equivalent of a human-lemur hybrid.</p>
How A. Latus Differs From its Parents.<p>Elucidating the identity of closely related fungal pathogens and how they differ from each other in infection-relevant characteristics is a key step toward reducing the burden of fungal disease. For example, we found that <em>A. latus</em> was three times more resistant than <em>A. nidulans</em>, the species it was originally identified as using microscopy-based methods, to one of the most common antifungal drugs, <a href="https://www.drugbank.ca/drugs/DB00520" target="_blank">caspofungin</a>. This result provides a clear example of the potential importance of accurate identification of the <em>Aspergillus</em> pathogen causing an infection.</p><p>We also examined how <em>A. latus</em> and <em>A. nidulans</em> interact with cells from our immune system. We found that immune cells were less efficient at combating <em>A. latus</em> compared to <em>A. nidulans</em>, suggesting the hybrid fungus may be trickier for our immune systems to identify and destroy.</p><p>In the midst of the COVID-19 pandemic, our quest to understand <em>Aspergillus</em> pathogens is becoming more urgent. Growing evidence suggests that <a href="https://doi.org/10.1111/myc.13096" target="_blank">a fraction of COVID-19 patients are also infected with <em>Aspergillus</em>.</a> More worrying is that these <a href="https://doi.org/10.3201/eid2607.201603" target="_blank">secondary <em>Aspergillus</em> infections</a> can worsen the clinical outcomes for those infected with the novel coronavirus. That being said, we stress that little is known about <em>Aspergillus</em> infections in COVID-19 patients due to a lack of systematic testing, and none of the infections identified so far appear to have been caused by hybrids.</p><p>So, when it comes to hybrids, some are fantastic (the minotaur), some are helpful (the mule) and some are dangerous (<em>Aspergillus latus</em>). Understanding more about the biology of <em>Aspergillus latus</em> may help in our understanding of how microbial pathogens arise and how to best prevent and combat their infections.</p>
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