Each year, trillions of aquatic animals—including fish, crustaceans, cephalopods, and other marine organisms—are captured, farmed, or otherwise exploited for human consumption. This level of extraction constitutes the largest systematic exploitation of sentient beings in human history and has severe implications for planetary health. Industrial fishing and aquaculture accelerate biodiversity loss, ocean acidification, and the collapse of ecosystems. Simultaneously, these practices undermine global food security by destabilizing marine ecosystems that regulate climate and sustain life-supporting ecological cycles. This paper argues that adopting a vegan worldview can substantially reduce this harm, allow for ecological regeneration, and mitigate the trajectory toward planetary collapse. By examining the moral, ecological, and existential stakes, this article frames veganism not merely as a dietary choice but as an urgent ethical imperative tied to survival.
Humanity’s relationship with the oceans reflects both our dependence upon and disregard for the natural systems that sustain life. Despite the oceans covering 71% of Earth’s surface and providing over half of the oxygen produced on the planet, industrial fishing practices continue to destroy these ecosystems at an unprecedented rate (Pauly & Zeller, 2016). Recent studies estimate that between one and three trillion aquatic animals are killed annually for food, a figure that dwarfs terrestrial slaughter (Mood & Brooke, 2019). Beyond direct exploitation, the collateral damage of bycatch, seafloor trawling, and aquaculture expansion devastates ecosystems, pushing many species toward extinction. The paradox of our time is that humanity, through its food system, is quite literally consuming itself toward extinction.
Exploitation is defined here as the use of sentient beings for human ends in ways that disregard their intrinsic value, autonomy, or welfare. This is evident in industrial fishing, where marine animals are captured en masse with little regard for suffering. Fish suffocate slowly on decks, crustaceans are boiled alive, and dolphins, turtles, and seabirds are frequently caught and discarded as waste (Davies et al., 2009). Aquaculture, marketed as a sustainable solution, mirrors the cruelty and inefficiency of terrestrial factory farming—confining sentient beings in cramped, disease-ridden enclosures while polluting surrounding waters. The sheer intentionality of this exploitation is significant: these harms are inflicted not out of necessity but largely for taste preference and cultural habit, given that plant-based diets can sustain human health (Craig, 2009).
The consequences of this exploitation extend beyond individual suffering. The oceans are undergoing accelerated collapse, driven by overfishing, acidification, and climate change. Industrial fishing disrupts food chains, alters predator-prey dynamics, and devastates habitats such as coral reefs and seagrass meadows. A landmark study by Worm et al. (2006) predicted the collapse of all commercial fisheries by 2048 if current trends persist. Already, populations of large predatory fish have declined by nearly 90% (Myers & Worm, 2003). As apex predators vanish, ecosystems destabilize, producing trophic cascades that ripple across global systems. This ecological unraveling jeopardizes oxygen production, carbon sequestration, and nutrient cycling—services upon which terrestrial life depends.
Proponents of aquaculture argue that farming fish alleviates pressure on wild populations. However, aquaculture is itself an ecological disaster. Many farmed fish are carnivorous, requiring vast amounts of wild-caught fish to sustain their feed. For instance, it is estimated that producing 1 kg of farmed salmon requires 1.5–3 kg of wild fish (Naylor et al., 2009). Additionally, aquaculture contributes to eutrophication, antibiotic resistance, and genetic pollution as escaped farmed fish disrupt wild populations. Rather than a solution, aquaculture compounds ecological harm, reflecting the unsustainable logic of using sentient beings as resources.
Ocean dead zones, scientifically referred to as hypoxic zones, are regions of the ocean where oxygen levels fall so low that most marine life cannot survive. Oxygen concentrations below 2 milligrams per liter are generally fatal for fish, crustaceans, and other marine organisms (NOAA, 2021). In these areas, mobile species may escape to safer waters, but immobile or slower-moving organisms, such as shellfish and benthic invertebrates, often die en masse. This creates large biological deserts in regions that would otherwise be rich with biodiversity. The Gulf of Mexico and Chesapeake Bay are two of the most well-studied examples, but more than 400 dead zones have been identified worldwide (Diaz & Rosenberg, 2008), underscoring the global scale of this ecological crisis.
The primary driver of hypoxic zones is nutrient pollution—particularly nitrogen and phosphorus—originating from human activities. Agriculture is the largest source of this pollution, with synthetic fertilizers and animal waste from factory farms washing into rivers and eventually reaching coastal waters. These excess nutrients fuel algal blooms that, when they die, sink to the seafloor. Bacterial decomposition of the algal biomass consumes vast amounts of oxygen, leaving behind hypoxic conditions (Woods Hole Oceanographic Institution, 2020). Industrial livestock production is a major contributor: concentrated animal feeding operations (CAFOs) generate massive amounts of manure, much of which cannot be absorbed by surrounding farmland and instead runs off into waterways. Thus, animal agriculture links directly to the proliferation of dead zones.
Dead zones significantly disrupt marine ecosystems and human economies. Hypoxic conditions cause mass die-offs of fish and invertebrates, undermining biodiversity and destabilizing food webs. These areas also damage commercial and subsistence fisheries, which rely on healthy marine habitats for production (Virginia Institute of Marine Science, 2022). In the Gulf of Mexico, for instance, the recurring summer dead zone—often exceeding 6,000 square miles—has devastated shrimp populations and harmed coastal economies. Beyond immediate impacts, hypoxic zones reduce the resilience of marine ecosystems to climate change and acidification, compounding global ecological stresses. The cascading effects reveal how nutrient pollution from land-based agriculture translates into oceanic degradation on a planetary scale.
Adopting a vegan food system directly addresses one of the root causes of dead zones: nutrient runoff from animal agriculture. By eliminating the demand for animal products, societies can dramatically reduce the production of animal waste and the reliance on nitrogen-heavy fertilizers used to grow feed crops. Plant-based food systems require less land, fertilizer, and water, thereby cutting nutrient pollution at its source (Poore & Nemecek, 2018). Furthermore, regenerative plant-based agricultural practices emphasize soil health and nutrient retention, preventing runoff into waterways. If widely adopted, veganism would not only reduce animal suffering but also shrink the size and frequency of dead zones, allowing ecosystems such as the Gulf of Mexico and Chesapeake Bay to regenerate over time. This transition demonstrates how ethical dietary choices align with ecological necessity, providing a pathway to restore marine life and safeguard planetary health.
Veganism offers a direct path toward harm reduction by eliminating demand for aquatic exploitation. If consumers shift away from animal products, the economic incentives driving industrial fishing and aquaculture collapse. Empirical data suggest that ecosystems can regenerate with remarkable speed when exploitation ceases. For example, marine reserves where fishing is banned demonstrate rapid biodiversity recovery and increases in biomass within 5–10 years (Lester et al., 2009). Under a vegan worldview—where exploitation of animals is minimized—oceans could rebound within decades, restoring ecological balance and ensuring long-term planetary resilience.