1. 5/9/2016 Making fish farming more sustainable
http://phys.org/news/201604fishfarmingsustainable.html 1/7
Home Biology Ecology April 14, 2016
Making fish farming more sustainable
April 14, 2016 by Renee Cho, Earth Institute, Columbia University
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Fish farming in Marseille, France. Credit: marcovdz
The American Heart Association recommends that we eat fish at least twice a week,
since fish are high in protein, low in saturated fats and rich in omega3 fatty acids.
Global per capita fish consumption has almost doubled from the 1960s to 2012. And
today, about half of all the seafood destined for human consumption is produced
through fish farming, also called aquaculture.
The Food and Agriculture Organization of the
U.N. (FAO) projects that by 2030,
aquaculture, one of the fastest growing
methods of producing food in the world, will
be responsible for almost twothirds of the
fish we eat.
The most common type of aquaculture is
farming in net pens or cages anchored to the
sea floor in the ocean near the coast. There
are also closed systems of tanks or ponds
that float on water or operate on land. The
FAO estimates that over 600 aquatic species
are produced globally in a variety of
aquaculture systems using freshwater, brackish water or salt water.
In the U.S., over 91 percent of the seafood we eat is imported. China is the largest
exporter of fish globally, the third largest importer of fish and the biggest aquaculture
producer. As early as 2500 B.C., the Chinese practiced fish farming, putting carp in
rice paddies where they ate insects and weeds, fertilized the rice, and then were
eaten. Today, 88 percent of the world's aquaculture comes from Asia.
While fish are known for their omega3 fatty acid benefits, they do not actually produce
omega3s themselves. Microscopic algae that live in fresh or salt water or sediments
produce them. Herbivorous fish and forage fish like sardines, anchovies and herring
obtain omega3s by eating the microalgae. Larger carnivorous fish such as salmon or
sea bass then eat the forage fish. Because salmon and other popular carnivorous fish
need omega3s to grow, 30 to 50 percent of the fish feed traditionally used for these
species consists of fishmeal (ground fish) and fish oil. Over 50 percent of the world's
fish oil is used in feed for farmed salmon.
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Provided by: Earth Institute, Columbia University
feedback to editors
want to keep eating seafood, aquaculture is the only way, and we have to do it in a
more sustainable way."
Explore further: Scientists discover key to easing aquaculture's reliance on
wildcaught fish
More information: To make sure you are choosing sustainably farmed seafood, visit
Seafood Watch: www.seafoodwatch.org/
This story is republished courtesy of Earth Institute, Columbia University:
blogs.ei.columbia.edu/
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