Fishery - Fundamentals of Fisheries

Definition and Scope of Fisheries What is a Fishery? A fishery is any activity that results in the harvesting of fish and other aquatic organisms for human use. This broad definition encompasses two fundamentally different approaches: capturing wild fish from natural water bodies, or raising fish through aquaculture (also called fish farming). The key point to understand is that fisheries are not just about catching fish in the ocean—they're a diverse set of economic activities spanning multiple environments and purposes. Types of Fisheries Fisheries are commonly classified by their economic purpose and scale: Commercial fisheries are the largest and most economically significant. These harvest fish specifically for sale in markets, whether from wild capture or through aquaculture operations. This is where most of the global fish supply comes from. Recreational fisheries involve sport or leisure fishing. While they may seem less economically important than commercial operations, recreational fishing generates substantial revenue in tourism, equipment sales, and local services in many regions. Subsistence fisheries exist primarily to feed fishing families and local communities, rather than for commercial sale. These are particularly important in developing regions where fishing provides food security for millions of people. What Counts as "Fish" in Fisheries? This is where terminology can become tricky. In fisheries science, the term "fish" is much broader than the finfish you might be imagining. Finfish (or "true fish") are the vertebrate animals like salmon, tuna, and cod—the species most people think of as fish. However, fisheries also target many invertebrate aquatic species that are economically valuable: Mollusks (clams, oysters, squid) Crustaceans (shrimp, crab, lobster) Echinoderms (sea urchins, sea cucumbers) When studying fisheries, remember that fishery statistics and discussions often include all these groups together. The distinction between finfish and invertebrates matters for understanding catch composition and ecosystem impacts, but all are "fish" in the fisheries context. Global Production Scale The sheer scale of global fisheries is remarkable. In 2016, 171 million tonnes of fish were produced worldwide. To put this in perspective, this means the world harvests roughly the weight of the entire United States population in fish every single year. The geographic distribution of this catch reveals important patterns: approximately 90% comes from oceanic waters while only 10% comes from freshwater sources like rivers, lakes, and ponds. Despite freshwater systems covering only a small fraction of Earth's surface, they produce a significant share of global catch, indicating their disproportionate importance for both food security and local economies. Economic Importance of Fisheries Employment and Livelihoods Fisheries are not just about food production—they're a major source of employment globally. Approximately 500 million people worldwide depend economically on fisheries and aquaculture, either as primary employment or as an important source of income. What's particularly important to understand is the role of small-scale fisheries. These are typically individual, family-owned operations using simpler technology. Despite often being overlooked in policy discussions, small-scale fisheries are enormously significant: They support 90% of the capture-fisheries workforce globally They employ 40% of the global fishing labor force In 2022, the geographic distribution of this workforce showed clear regional patterns: 77% of the global fisheries workforce was in Asia, with 16% in Africa and 5% in Latin America and the Caribbean. This geographic concentration reflects where both wild fishing grounds and aquaculture operations are most developed. Economic Value The economic contribution of fisheries is substantial. In 2014, global fisheries added approximately US $270 billion per year to world GDP. This figure includes both the value of the fish themselves and all the related economic activity (processing, distribution, retail, etc.). Interestingly, economic analyses suggest that with more sustainable fishing practices, this value could increase by up to US $50 billion annually—a powerful illustration that overfishing isn't just an ecological problem, it's economically irrational. Production and Consumption Patterns Global fish consumption has grown dramatically. Per-capita fish consumption reached 20.3 kg per person in 2016, which is roughly double the rate of population growth since 1961. This reflects both growing populations and increasing per-capita demand as incomes rise globally. <extrainfo> This growth in consumption is particularly notable because it shows that fisheries aren't just expanding because there are more people—demand per person is also increasing significantly. </extrainfo> Small-Scale Fisheries: An Overlooked Giant Here's a fact that often surprises people: small-scale fisheries contributed an estimated 40% of the global catch in 2022. Yet despite producing nearly half the world's fish catch, small-scale fisheries often receive minimal research attention and limited policy support. This reveals an important dynamic in global fisheries: while large industrial operations dominate discussions and capture public attention, the backbone of global food security actually depends on millions of small fishing operations. Understanding this distinction is crucial because small-scale and industrial fisheries operate under different constraints, face different challenges, and respond to policy changes differently. Fisheries Sectors and Production Wild Capture vs. Aquaculture A fundamental division in fisheries exists between two production methods: Wild capture fisheries harvest fish from natural water bodies. These have historically dominated global production and still represent the majority of total catch. Aquaculture (fish farming) raises fish in controlled environments—whether in ponds, raceways, or ocean cages. While aquaculture currently provides only about 10% of total global catch by weight, it is the fastest-growing component of global fisheries production. The growth trajectory of aquaculture is important because wild capture is increasingly constrained by overfishing and ecosystem limits, whereas aquaculture has significant room for expansion (though it faces its own environmental challenges). Where Fish Come From: Ocean vs. Inland The geographic distribution of catches shows a clear pattern: Ocean fisheries dominate global production, accounting for approximately 90% of global fishery catches. Most of this occurs in relatively narrow zones near coastal shelves, where nutrient upwelling from deeper waters supports exceptionally high biological productivity. These upwelling zones, though covering only a fraction of the ocean, are where marine ecosystems concentrate the richest concentrations of harvestable fish. Inland fisheries produced 11.3 million tonnes in 2022, concentrated in specific regions: Asia dominates with 63.4% of inland catch Africa produces 29.4% of inland catch The remainder comes from other regions For understanding fisheries distribution, remember that not all regions contribute equally. The concentration of catches in particular regions—especially coastal upwelling zones and Asian inland waters—reflects where fish populations are most abundant and most accessible to current fishing technology.