Aquaculture for all

How Aquaculture and Science Changed Nepal

Technology & equipment Economics Carp +5 more

NEPAL - To produce more fish, the government encouraged cage fishing. Cage culture-like raising chickens in coops but under water-began in 1972 in Nepal's Pokhara Valley at Lakes Phewa, Begnas and Rupa. The plan worked, but yielded modest fish harvests. People remained undernourished.

Today, the Nepal interior economy is thriving because of a small, but significant, change in production technique. Families not only have food, but a surplus to sell for cash. Tourists flock to the area to sample the catch, bringing in more money. All that was needed was a little science from a University of Missouri aquatic ecologist.

In 1985 Jack Jones, now the Dunmire Professor of Water Quality in the University of Missouri College of Agriculture, Food and Natural Resource's Department of Fisheries and Wildlife Sciences, wanted to add an international component to his emerging career. He noticed Nepal's developing aquaculture and thought his expertise could help. With a National Science Foundation grant, he traveled to the country between Tibet and China.

An expert in limnology, the inland version of oceanography, he saw problems. There was a shortage of fingerlings to stock the lakes and the rural families who farmed the fish, one of the lowest of the country's castes, couldn't afford feed pellets. They relied on naturally-occurring plankton for the fish to eatan iffy thing.

Jones set up shop in a stone building and collected data. Teamed with fellow scientists from the Integrated Fishery and Fish Culture Development Project, part of the United Nations Food and Agriculture Organization, he saw a puzzling fact. Cages on one lake yielded twice the bighead and silver carp.

To find the secret, he investigated those things that promote healthy fishtemperature, food, water oxygenation and sunlight. While the scientific variables were complex, graphs showed the optimum cage location was not just under the surface, as commonly done, but a few feet deeper where oxygen, light and naturally-occurring algae were close to prefect.

Moving cages to this depth was simplicity itselfthe farmers merely tipped their 15 x 6-ft. cages into a vertical position. The fish easily swam to their best depth. It didn't take long to see results. Jones and colleagues inspected the horizontal control cages and found the expected growth of fish. The vertical cages, by contrast, teemed with dramatically larger and healthier carp. The initial count showed a doubling of fish growth.

"We let out a war whoop," Jones said. "Word got out almost overnight and the other families began switching their cages to the vertical position."

The excitement was justified. Nepal is among the world's poorest and least developed countries with almost one-third of its population living in poverty. Primitive agriculture is the mainstay of the economy, providing a livelihood for three-fourths of the population and accounting for almost 40 percent of gross national product Its population of less than 30 million, according to the CIA Fact Book, has a median age of less than 21 years. It's young because most of the population dies before 60.

Yet, it is rich in interior lakes where some 186 fish species thrive, which is why the government invested in cage fishing. Approximately 400,000 hectares of water are available for aquaculture development.

"By driving fish production up you drive down price," Jones said.

Today, reports the fisheries journal, one family can operate a five-cage system that adds 9,000 to 14,000 Nepali rupees ( $6,300 to $10,000 ) to their annual incomean enormous boost in a country where the average annual household income is still under $300 per year. The fish harvest has also changed a largely landless people to a home-owning one with houses with toilets, gas stoves and TVs. Some can buy a motorbike.

"Now, fish farmers own farmland and are sending their sons and daughters to college," Jones said. "The caste now boasts its first college graduate. Before, the kids were sent overseas to oilfields for hard work and to send money home."

In 2000 in Nepal, according to government information, about 142,000 males and 223,000 females are involved in fisheriesup from the 1980s when about 80,000 people depended on fish. Cheap start-up costs mean even the poorest Nepalese can cage fish. As fewer than half of the population is literatea situation worse among the lower castesany job skill taught via on-the-job training is particularly prized.

For Jones, his two decade project has come full circle. He recently was honored as a Senior Fulbright Fellow at the Nepal Agriculture and Forestry University in Rampur. There, he'll collaborate with the next generation of scientists looking at ways to make cage aquaculture even more efficient.

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