Skip to main content icon/video/no-internet

Fisheries encompass the variety of human activities to harvest aquatic animals and plants. The term includes the harvest of fish per se as well as crustaceans, seaweeds, mollusks, and marine mammals, but not aquaculture. Fisheries can be in either inland, coastal, or high seas environments. Globally, about 90 million metric tons of fish are landed yearly, about one-eighth from inland waters, the remainder from the oceans. Fishing gears or instruments for harvest are quite diverse: from static gears such as fish traps, weirs, hooks and lines, and gillnets, to mobile gears like spears, cast nets, haul and purse seines, trawls, and dredges.

Fishers can be differentiated into two main categories: artisanal and commercial. Artisanal fisheries are typically defined by low levels of capitalization and productivity and the use of catches for subsistence or localized markets, whereas commercial fisheries are defined oppositely as highly capitalized, efficient, and oriented toward global markets. These ideal types seldom capture the empirical reality of fisheries, as many fishers deemed artisanal have motorized boats, sell their catches for distant markets, and can be quite efficient; and many deemed commercial supply local buyers only, have small boats, and are engaged in fishing informally in concert with other sources of livelihood, a characteristic generally ascribed to artisanal fishers.

Dependence on Fishing

There are about two million fishers in Africa—the vast majority artisanal—and this number is increased several times when marketing and processing jobs are included. Six million people are employed in fishing or fisheries-related jobs in India. Fisheries are of paramount importance for often-rural localities, as they can provide employment, a tax base for local services, and cultural value. Seafood (from aquaculture and fisheries) accounts for only a small percentage of total caloric intake in almost all countries, but in many countries it accounts for 20 percent or more of protein intake and is cheaper than alternative protein sources. Many southern islands and coastal nations and Japan are highly dependent on fisheries for their food security. People in Global North countries on average eat 27 kilograms of seafood per year, while those in the Global South, nine kilograms. The reasons for this disparity include differences in human population and fishery productivity, fishery exports and imports, and the harvest of fish by foreign versus domestic fleets.

Fish also contribute to human nutrition indirectly through fishmeal. Some 30 million tons a year, a third of global catches, are reduced into about six million tons of fish meals and oils; the majority goes to feeding livestock like pigs and chickens, while aquaculture and industrial purposes get smaller portions.

Geographic Distribution

Geographic distribution of fisheries stocks is very uneven. Some species are immobile or localized, like mollusks or shrimp, while others like tuna are highly migratory. Estuarine and reef ecosystems can equal the most prolific terrestrial ones in terms of productivity. Upwelling zones—where currents at continental margins push up deep water and mix it with surface layers—are also highly productive. The oceans as a whole are estimated to produce two-fifths of the earth's total primary productivity. In marine ecosystems, a productive plant biomass feeds a proportionately larger standing stock than terrestrial ecosystms. Since much of that stock consists of zooplankton that are not harvested by people, fisheries are more dependent on secondary and tertiary consumers, which are more abundant in the water than on land per unit of primary productivity. Target species on the high seas tend to be trophically more distant from primary production than those of estuarine and inland fisheries.

...

  • Loading...
locked icon

Sign in to access this content

Get a 30 day FREE TRIAL

  • Watch videos from a variety of sources bringing classroom topics to life
  • Read modern, diverse business cases
  • Explore hundreds of books and reference titles

Sage Recommends

We found other relevant content for you on other Sage platforms.

Loading