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Warming oceans and marine species migration: poleward bound

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How Fish Are Being Affected by Climate Change

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How Fish Are Being Affected by Climate Change

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NOURA AL-RAJHI   |   JULY 24, 2020

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The Beaver State podcast Episode 22: Climate Change

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The Beaver State podcast Episode 22: Climate Change

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Dr. Shaun Clements | August 20, 2020

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The Beaver State Podcast Episode 22: Climate Change | Oregon Department of Fish & Wildlife

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Dr. Shaun Clements is at the interface between science and policy, where he looks at things like the impacts of climate change on our oceans, rivers and the fish that live there. Ultimately he helps create policy based on the scientific data he collects and sees. While many think of climate change a…

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Netflix | 2021

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Passionate about ocean life, a filmmaker sets out to document the harm that humans do to marine species - and uncovers alarming global corruption.

Watch all you want.

Trailer: Seaspiracy

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Controversial, Provocative, Investigative

German, English - Audio Description, English [Original], Spanish, French, Italian

English, Spanish, French, Simplified Chinese, Traditional Chinese

When a plane mysteriously lands years after takeoff, the people onboard return to a world that has moved on without them and face strange new realities.

When a father and daughter discover they both secretly work for the CIA, an already dicey undercover mission turns into a dysfunctional family affair.

When the son she's never known gets kidnapped, former special agent Nina dusts off her deadly skills to bring him home - no matter who gets in her way.

Eight of the country's best backyard smokers and pitmasters vie for the title of American Barbecue Champion in a fierce but friendly faceoff.

At the bitter end of WWII, a German deserter and a young woman are drawn into bloody battle with a group of Nazis hunting for hidden gold.

Siren: Survive the Island

24 female police officers, firefighters, bodyguards, soldiers, athletes and stuntwomen team up by profession to compete for survival on a remote island.

When a boat loaded with cocaine sinks off his home island, Eduardo sees a risky but exciting opportunity to make money and fulfill impossible dreams.

After a traumatic miscarriage, a young couple adopts two peculiar twins from a convent whose obsession with religion soon disturbs the family.

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Watch Seaspiracy | Netflix Official Site

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Passionate about ocean life, a filmmaker sets out to document the harm that humans do to marine species - and uncovers alarming global corruption. Watch all you want. Trailer: Seaspiracy Downloads only available on ad-free plans.

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End Overfishing and Increase the Resilience of the Ocean to Climate Change

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End Overfishing and Increase the Resilience of the Ocean to Climate Change

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U. Rashid Sumaila* and Travis C. Tai | July 15, 2020

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Fisheries Economics Research Unit, Institute for the Oceans and Fisheries, School of Public Policy and Global Affairs, The University of British Columbia, Vancouver, BC, Canada

Marine fish stocks and the ecosystems they inhabit are in decline in many parts of our ocean, including in some European waters, because of overfishing and the ecosystem effect of fishing in general. Simultaneously, climate change is disrupting the physics, chemistry and ecology of the ocean, with significant consequences on the life it holds. While the positive effects of mitigating climate change on the ocean and marine life are currently being documented, papers that examine how ending overfishing could increase ocean resilience to climate change are less common. The goal of this paper is to review the current literature and conduct an analysis that demonstrate that ending overfishing and reducing other negative ecosystem effects of fishing would make fish stocks and marine ecosystems more resilient to climate change. Our findings suggest that fish and fish stocks are no different from other living organisms and are more likely to survive external pressures when healthy.

Highlights

- Marine fish stocks are overfished in many parts of our ocean;

- Climate change is having significant consequences on ocean life;

- We demonstrate that ending overfishing could make fish stocks more climate resilient;

- Fish and fish stocks are no different from other organisms and more likely to survive when healthy.

Introduction

We know the critical importance of the ocean for planetary function and life on Earth-mediating global weather patterns, cycling of carbon (i.e., biological carbon pump) and carbon sequestration (i.e., carbon sink), contributing almost half of the annual primary production on Earth, to name a few ( Brierley and Kingsford, 2009). Marine ecosystem goods and services to human society are dependent on ocean health, yet there are many potential consequences of continuous human population growth and rising per capita consumption, in particular human-accelerated climate change and overfishing to meet global demands.

Fish are an important part of marine ecosystems and are a central part of the marine food web where predator-prey relations both within different fish species and between fish and other marine life keep the ocean thriving. An ocean full of life is also important as a source of food and livelihood for hundreds of millions of people worldwide. Unfortunately, fish and life in the ocean in general are facing a multitude of threats, two of the biggest being overfishing and climate change.

Here, we ask and address the question: How would the reduction of overfishing as broadly defined herein increase the ability of fish stocks to withstand the impacts of climate change, making the ocean more resilient to such changes. We conduct a selected literature review and carry out an analysis that reveals the links between reducing overfishing, improvements in fish stock and marine ecosystem health and increased resilience of marine ecosystems to the effects of climate change. We use fish stocks of the European Union as an example throughout.

A Broad Definition of Overfishing

We adopt a dynamic and broad concept of overfishing as captured by the concept of fishing down marine food web of Pauly et al. (2005). This concept does not only capture the fact that we are taking too many fish than nature can sustainably yield annually, we are also taking too many high tropic level and valuable fish species thereby truncating the food web ( Figure 1). While both of these are happening, we are also disturbing and, in some cases, destroying ocean habitats through the use of harmful fishing gears ( Chuenpagdee et al., 2003). All of these three aspects of overfishing combine to weaken the health of both fish stocks and the marine ecosystem as a whole. According to the FAO, overfishing and habitat destruction have resulted in the depletion of a third of fish stocks worldwide. Academic research has reported even higher levels of overfished stocks (e.g., Pauly et al., 2005). For fisheries in the European Union (EU), estimates suggest that "at least 40% of fish stocks in the North East Atlantic and 87% in the Mediterranean and Black Seas, are currently subject to unsustainable fishing practices ( STECF, 2019)." It should be noted that these numbers are averages and that some Atlantic EU stocks have seen improvements during the past decade. At the same time the situation in other European waters are worse than the averages.

Figure 1. Overfishing truncates the food web and simulates the same effects of "fishing down food webs." Figure adopted from Pauly et al. (2005).

Human society has had considerable and far-reaching impacts on the global ocean ( Halpern et al., 2015), and overfishing has had lasting effects on marine ecosystems and continues to be one of the greatest threats to ocean health ( Pauly et al., 2005; Jackson et al., 2007; Le Quesne and Jennings, 2012; Halpern et al., 2015; Gattuso et al., 2018). Overfishing often has major ecosystem effects ( Coll et al., 2008; Sumaila et al., 2019) and has even been identified as a driver of ecosystem regime shifts ( Daskalov et al., 2007). As a stressor, overfishing will have negative effects on many indicators of ocean health, including biodiversity, food security, and coastal livelihoods and economies ( Halpern et al., 2012). The direct impacts of overfishing can reduce fish biomass, affecting biodiversity and the sustainability of fisheries, as well as exacerbate the impacts of destructive fishing gear on marine ecosystems (e.g., bottom trawls). Furthermore, where overfishing is a result of illegal, unreported, or unregulated fishing, these fishing operations are often also conducted with highly impacting fishing gears-e.g., bottom trawls-that negatively affect benthic substrate ( Bailey and Sumaila, 2015).

In European waters, recent reports estimate that between 40 and70% of fish stocks are currently at an unsustainable level-either overfished or at their lower biomass limits ( Froese et al., 2018; STECF, 2019). In the Mediterranean Sea, it is estimated that over 90% of stocks are overexploited ( Colloca et al., 2017). Similarly, the Black Sea also sees high levels of exploitation, with continuing declines in catch ( Tsikliras et al., 2015). In contrast, some northern European fish stocks are faring better, e.g., those in the Norwegian Sea and Barents Sea-due to historically well-managed fisheries some fish stocks in these waters are at maximum sustainable yield (MSY) ( Gullestad et al., 2014; Froese et al., 2018). The January 1, 2020 deadline for the proposed plan to end overfishing in the EU is approaching. While there are some trends heading in the right direction, the EU is far from eliminating overfishing in its waters. In fact, on August 30, 2019, the EU proposed to continue overfishing past the deadline for January 1 2020, https://twitter.com/SeasAtRisk/status/1167458264566706176.

Climate Change Impacts on Fish and Ocean Life

Climate-related impacts on marine environments are already impacting species, populations, and ecosystems ( Pörtner et al., 2014). Figure 2 provides a quick summary of the channels through which climate change can impact marine ecosystems and life. Responses to environmental change for marine organisms is largely determined by physiological tolerance, and they respond with changes to physiological function and behavior shaped by their evolutionary history ( Doney et al., 2012; Somero, 2012). For example, changes in temperature-e.g., ocean warming-that go beyond an organism's optimal range will initiate physiological responses that may affect biological performance including growth, reproduction, and survival. Climate-related impacts may also lead to shifts in phenology (timing of seasonal biological events). For example, in European waters we have observed shifts in the timing of zooplankton biomass formation in the North Sea ( Schlüter et al., 2010), juvenile Atlantic salmon migration ( Kennedy and Crozier, 2010; Otero et al., 2014), and general widespread ecosystem shifts across all major taxonomic groups in the United Kingdom ( Thackeray et al., 2010). These direct effects may translate into higher levels of biological organization, affecting population dynamics, and ecosystem structure, function, and diversity [e.g., tropicalisation of temperate reefs ( Vergés et al., 2019), localized species invasions and extinctions ( Philippart et al., 2011)].

Figure 2. Climate change impacts on marine ecosystems and goods and services provided to human society. Figure adopted from Sumaila et al. (2019).

The onset of rapid climate-related changes in these ecosystems is increasing pressure on fish stocks, with the potential of extinction for some fish species. Evidence of large-scale shifts in species' distributions to deeper and higher latitudinal waters has already been documented extensively in the past two decades (e.g., Parmesan and Yohe, 2003; Perry et al., 2005; Dulvy et al., 2008), and these climate effects have continued to manifest at the species ( Montero-Serra et al., 2015), ecosystem ( Frainer et al., 2017), and fisheries levels ( Cheung et al., 2013). Swift action is critical at this stage to ensure the long-term sustainability of marine ecosystems and fisheries ( Gattuso et al., 2018) and the varied and crucial benefits they provide ( Rogers et al., 2014).

How Ending Overfishing Can Increase Fish Stock Resilience Under Climate Change

Ending overfishing results in: the reduction of fishing effort to ensure sustainable levels of fish catch and yield given the management structure in place (e.g., MSY); a healthier, richer ocean with more diverse fish populations; a more complete marine food web with fish of all trophic levels well represented; and a marine ecosystem with healthier, more varied and more complete marine habitats. Based on these four consequences of ending overfishing, we see at least 5 ways in which ending overfishing can increase the resilience of fish stocks and the marine ecosystem in the face of climate change. Three of these increase resilience by leaving more fish in the ocean; maintaining the structure of marine food webs; and ensuring rich and diverse marine habitats and ecosystems. The remaining two help fish stocks and the marine ecosystem by reducing the amount of CO ₂ in the atmosphere through the (i) emission of less CO ₂ by the fishing sector itself; and (ii) sequestration of higher levels of CO ₂ that more fish in the ocean that ending overfishing entails.

End Overfishing, Increase Fish Abundance of Commercial Stocks

Overfishing takes too much fish out of a renewable natural capital just like withdrawing more money out of a bank account than the savings can generate annually. And just like a bank account, taking more than the annual yield that a fish stock can generate makes the system more vulnerable; the fish stocks and the marine ecosystem would be more vulnerable to change even without a stressor such as climate change. Overfishing has been widely accepted as a direct pressure and major risk to marine environments and ocean health, drastically reducing fish biomass in the ocean ( Pauly et al., 2005; Halpern et al., 2015).

End Overfishing, Protect the Integrity of Marine Food Webs

Overfishing has already done considerable damage to ecosystems and has resulted in trophic cascades (i.e., restructuring of the food chain). It takes too many large individuals from higher trophic levels and high value fish out of the marine ecosystem, going from the highest trophic level and most valuable species at the time they are fishing resulting in serial depletion and fishing down marine food webs ( Pauly et al., 2005). These all serve to weaken fish stocks and make them vulnerable to all sorts of stressors including climate change. Climate-related impacts on marine ecosystems affect natural and human elements of ocean health. Changes in species' distribution and abundance will increase local invasions and extinctions, redistributing marine biodiversity and its composition ( Cheung et al., 2009; Pecl et al., 2017; Sunday et al., 2017). Subsequently, this will affect marine ecosystem goods and services, including food security and dependent coastal communities ( Halpern et al., 2012; Lam et al., 2014; Sumaila et al., 2019). Furthermore, the increased variability of environmental change will also increase the variability-and decrease the predictability and reliability-of goods and services to human society ( IPCC, 2014).

End Overfishing, Avoid Marine Habitat Degradation

Indirect pressures of overfishing include habitat degradation (from destructive fishing gear) and pollution (i.e., plastic, oil). Overfishing has already resulted in habitat loss ( Daskalov et al., 2007; Halpern et al., 2015). Improving aspects of ocean health such as the condition of marine habitats (corals, seamounts, mangroves and seagrass) can benefit other components of the ecosystem including fish stocks and increase resilience to other pressures-in particular, climate change ( Gaines et al., 2018). While pressures and stressors will decrease fish stock abundance and marine ecosystem health, resilience counteracts these negative effects ( Halpern et al., 2012).

Habitat loss has implications for marine life, but will also affect other aspects of ocean health such as coastal protection and carbon storage. Hence, the reduction of habitat degradation due to the elimination of overfishing would increase the health of marine ecosystems and the fish stocks they sustain.

End Overfishing, Decrease CO₂ Emissions by the Fishing Sector

The world is awash with fishing vessels. According to the FAO there are currently 4.6 million vessels of various sizes ( FAO, 2018). It is estimated that the fishing capacity and effort currently being used to catch fish is between 40 and 60% of what is needed to fish at MSY. Ending overfishing and rebuilding depleted fish stocks will entail cutting overcapacity by a significant amount. Less fishing vessels chasing few fish in the ocean will mean the fishing sector, which is credited with emitting at least 1% of global CO ₂ emissions could cut its emissions by at least 50%, thereby contributing to mitigating climate change. This will in turn benefit fish stocks and the marine ecosystem.

End Overfishing, Increase Fish Biomass and CO₂ Sequestration by Marine Life

Maintaining healthier fish stocks imbedded in a full functioning ocean ecosystem and habitat is important for planetary function-e.g., carbon storage, coastal protection/erosion. The role of the oceans in the regulation of the global carbon cycle is well known ( Rogers et al., 2014). It is estimated that the ocean contains about 38,000 Gigatonnes (Gt) of carbon, and this is by far the largest reservoir of carbon in the Earth system ( Houghton, 2007). Approximately 6,000 Gt of carbon also lies in marine sediments ( Houghton, 2007). Estimates of the flux of carbon from the surface ocean to intermediate depths and the deep ocean vary but come from both vertical mixing and the sinking of organic primary production ( Houghton, 2007). The oceans are thought to have been the only net sink of human CO ₂ emissions over the last 200 years with terrestrial ecosystems likely to have been a net emitter ( Sabine et al., 2004). By capturing and storing carbon that would otherwise enter the atmosphere and contribute to climate change ( Rogers et al., 2014), healthy fish stocks and marine ecosystems can help to mitigate global warming, which in turn protects the ocean and makes marine life more resilient, in a cyclic positive feedback loop ( Figure 3).

Figure 3. Ending overfishing requires positive feedback between people and the ocean.

Climate change and overfishing are working together to accelerate the decline of ocean health putting marine ecosystems and the goods and services provided to society at risk. Ending overfishing would reduce the cumulative pressures on the ocean and increase its resilience, partly mitigating the effects of climate change. Current literature suggests that many possible mechanisms and solutions to adjust the current structure and narrative of fisheries to reduce the pressures on marine ecosystems as a mitigation tool against climate change ( Cheung et al., 2017, 2018; Gaines et al., 2018; Gattuso et al., 2018).

Cheung et al. (2018) explored the extinction risk of overfishing and climate change using IUCN categories and species distribution models. The authors found very high extinction risk for 60% of assessed species with high emissions scenarios and no fisheries management change. With improved fisheries management and climate change mitigation the number of species with very high extinction risk is reduced by 63%. Gaines et al. (2018) set out to understand whether reducing overfishing through fisheries management reform will increase fisheries catch, even under high climate change. They found that despite the negative effects of climate change on fish stocks, reducing fishing effort to ensure MSY will result in gains in catch based on the current state of overfished stocks. Efforts to improve management and the health of fish stocks are best met with ocean solutions that combine global and local solutions, and prioritize fully comprehensive assessments that evaluate trade-offs, benefits and costs, and the effectiveness of management measures in consideration ( Gattuso et al., 2018).

Policies and Actions to End Overfishing

In general, people overfish because it pays to do so. Hence, the solution to overfishing is to remove the incentive to overfish by making it unprofitable to do so. The organizing framework we propose for ending overfishing is depicted in Figure 3. We assert that the key to successfully ending overfishing is to design policies and take actions that promote positive feedback while dampening negative feedback between people and the ocean. Our discussion of specific solutions is couched within this framework.

National, regional and global fisheries management is not anywhere close to fully effective ( Pitcher et al., 2009). Ineffective management reinforces negative feedback from people to nature because our tendency to race for the fish is not managed effectively resulting in overfishing, which makes fish more scarce, aggravating the need to race for the fish even harder with time. While national management is important, regional and global management is also critical because many fish stocks are shared, transboundary, and highly migratory, straddling both EEZs and the high seas. A recent example of ineffective management was provided at last December's AGRIFISH Council in Brussels. This is an annual gathering where EU fishing quotas are allocated behind closed-door. At this particular meeting fisheries ministers agreed to quotas that were a whopping 300,000 t above scientific advice for the North East Atlantic in 2019. Such an action will not be taken in a well-managed fishery. Clearly, improving fisheries management by avoiding such actions would address current overfishing in many fisheries in the EU (and around the world).

Currently most fisheries subsidies are harmful in that they stimulate overcapacity and overfishing ( Sumaila et al., 2019), which reinforces negative feedback from nature to people and vice versa. As fish stocks get depleted partly due to subsidies, the fish available to feed people diminishes making people more desperate to catch whatever they can-further aggravating the depletion and desperations. What is more, most of the subsidies provided to fishing sector go to large-scale industrial fisheries to the detriment of small-scale fishers ( Schuhbauer et al., 2017; Figure 4).

Figure 4. Subsidies that stimulate overcapacity in large-scale industrial fisheries can lead to overfishing. Figure adopted from Schuhbauer et al. (2017).

Designating adequate and high quality marine protected areas is a viable and effective strategy for tackling overfishing, and also provides many ancillary benefits to ocean health. Marine reserves that prevent fishing activities can protect important habitat refuges for fish populations and reducing the probability of overfishing (e.g., Afonso et al., 2011). Furthermore, it protects habitats from destructive fishing gear ( McLeod et al., 2009; Green et al., 2014), improving overall biodiversity and fisheries-related indicators of ocean health. Subsequently, marine reserves will improve other aspects of ocean health that directly address climate change mitigation ( Roberts et al., 2017), specifically: carbon sequestration and storage by protecting critical habitat (e.g., reefs, seagrass beds, kelp); and reducing coastal erosion due to sea level rise by preserving safeguarding habitats.

Concluding Remarks

The combination of overfishing and climate change is deadly for fish stocks and marine ecosystems, and just like climate change mitigation will help the long term sustainability of the marine ecosystem. Ending overfishing would enable more effective conservation and sustainable use of marine fish and ecosystems, making it more resilient to climate change.

Reducing exploitation rates to end overfishing has been widely discussed as a viable climate change mitigation strategy. The MSY of fisheries is projected to generally decrease with climate change, yet some areas will face increases (i.e., temperate and polar regions) while others will see major declines (i.e., tropical regions) ( Cheung et al., 2010). Despite the historical global spatial expansion of fisheries and its extensive footprint on marine ecosystems ( Halpern et al., 2008; Swartz et al., 2010), current fisheries catch are estimated to be underperforming due to inefficiencies with management, regulation, and compliance. Due to the current inefficiencies and operating at below MSY, improvements in management to achieve MSY would not only increase long-term catch, but actually offset some of the negative effects of climate change on catch ( Gaines et al., 2018). For overfished EU fish stocks, this could prove extremely valuable to increase catch by improving management as a climate change adaptation strategy.

Implementing policies, strategies and actions that reinforce positive feedback from people to nature and vice versa would help end overfishing, increasing resilience to climate change as it has been found to help with recovery from extreme climate impacts ( O'Leary et al., 2017; Roberts et al., 2017). Therefore, ending overfishing will not only provide more seafood over time but it will also increase fish stock and ocean resilience by helping to reduce CO ₂ in the atmosphere via the emission of less CO ₂ by the fishing sector and sequestration of carbon in the deep ocean, strengthening the health and abundance of life in the ocean.

Author Contributions

US conceived the manuscript. US and TT wrote the manuscript. Both authors contributed to the manuscript and approved the submitted version.

Funding

The funding organization is Our Ocean. Award #0001/2019.

Conflict of Interest

The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.

Acknowledgments

The authors would like to thank Our Fish for financial support which made this work possible. In addition, US thanks the OceanCanada Partnership supported by the Social Sciences and Humanities Research Council of Canada (SSHRC). Finally, it should be noted that an initial version of this manuscript has been released as a working manuscript at OceanCanada Partnership, University of British Columbia, (US and TT).

References

Sabine, C. L., Feely, R. A., Gruber, N., Key, R. M., Lee, K., Bullister, J. L., et al. (2004). The oceanic sink for anthropogenic CO ₂. Science 305, 367-371. doi: 10.1126/science.1097403

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End Overfishing and Increase the Resilience of the Ocean to Climate Change

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Marine fish stocks and the ecosystems they inhabit are in decline in many parts of our ocean, including in some European waters, because of overfishing and the ecosystem effect of fishing in general. Simultaneously, climate change is disrupting the physics, chemistry and ecology of the ocean, with significant consequences on the life it holds.

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Understand how overfishing and climate change lead to the depletion of worldwide fish population

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Understand how overfishing and climate change lead to the depletion of worldwide fish population

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Understand how overfishing and climate change lead to the depletion of worldwide fish population Contunico © ZDF Enterprises GmbH, Mainz

NARRATOR: The Coast Guard is policing the fisheries just off the Kiel Fjord. Fish are a resource that is becoming ever scarcer. To ensure that they come into port with some fish in their net, more and more fishermen are breaking the rules. They haul in immature fish, depleting populations even further. Many fishing nations are policing waters more intensely in an attempt to protect at least the populations in their coastal areas. Fifty years ago the ocean's bounty appeared inexhaustible. In the meantime, however, humans have succeeded in reducing fish populations to a fraction of their once flourishing numbers. Researchers assume that climate change has also harmed fish populations. Many breeds require freezing cold, which, for example, helps keep predators at bay. But the last time the Baltic and North seas froze over was more than 12 years ago.

PROF. REINHOLD HANEL [translation]: "Such changes can now be proven for the Baltic Sea. It starts at plankton numbers and extends throughout the entire food chain to fish. And we are getting a huge influx of warm-water-loving species. This could change the makeup of the fauna, and perhaps the type of fish we find on our menus."

NARRATOR: The warmer seas are now home to sardines, banded barbs and exotic looking squid. But there are far too few of them to awaken the interest of humans. The harbor seals and grey seals, however, of the Baltic and North seas are delighted with the development. They appear to have a taste for their new neighbors and their numbers are growing fantastically. Back on the high seas, even though the watchdogs do catch a few black sheep among the local fisherman now and then, they do know one thing. Those who fish with no scruples whatsoever are far out at sea; large commercial fisheries running with state-of-the-art technology on board that allow them to scoop up whole schools of fish in one go. The number of fish caught per year has quadrupled since 1950. The world's oceans are being depleted.

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Understand how overfishing and climate change lead to the depletion of worldwide fish population

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NARRATOR: The Coast Guard is policing the fisheries just off the Kiel Fjord. Fish are a resource that is becoming ever scarcer. To ensure that they come into port with some fish in their net, more and more fishermen are breaking the rules. They haul in immature fish, depleting populations even further.

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Webinar Climate action and overfishing with Dr Rashid Sumaila

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Webinar Climate action and overfishing with Dr Rashid Sumaila

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Webinar Climate action and overfishing with Dr Rashid Sumaila

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Climate Change Threatens the World’s Fisheries, Food Billions of People Rely On

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Climate Change Threatens the World’s Fisheries, Food Billions of People Rely On

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Georgina Gustin | September 29, 2019

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Influence of climate change on fisheries resources in the Arab region

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Influence of climate change on fisheries resources in the Arab region

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Izzat Feidi & Fisheries Consultant

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Matthew Judge & Robert Drane | January 14, 2015

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TROUBLED WATERS - DOCUMENTARY ABOUT IMPACTS OF OVERFISHING.

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Árni M. Mathiesen | May 9, 2015

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Food and Agriculture Organization of the United Nations