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Wednesday, January 21, 2015

21/01/2015: Global: channel catfish

First published in International Aquafeed November - December 2014

Interest in channel catfish began when the United States Fish and Fisheries Commission began stocking fish collected from the wild in the 1870s. Channel catfish were native primarily to the Mississippi River Valley but were widely introduced throughout the nation by the Commission. Spawning was first achieved in 1890 in aquaria, at which time it was learned that the male guards the eggs during incubation.

http://issuu.com/international_aquafeed/docs/iaf1406_w1/48

Pond spawning was first observed in 1914 at a government hatchery. Spawning nests (nail kegs) were first used in 1916 and the numbers of fingerlings produced per stocked female increased. Indoor hatching of channel catfish eggs in troughs equipped with paddlewheels to move the water in a manner that simulates the fanning of the eggs by the male fish was first accomplished in 1929.

Commercial aquaculture was first considered to be economically practical in the late 1950s. Catfish farming developed rapidly during the 1960s and 1970s as improvements in pond management, disease identification and control, and prepared feeds were developed and adopted by farmers. The commercial industry developed in the southern United States within the original range of the species. At least 90 percent of the farmed fish are produced in the Mississippi River Valley region.

Channel catfish have been introduced into Europe, Russian Federation, Cuba and portions of Latin America. The primary interest in many countries appears to be recreational fishing.

Channel catfish are reared in ponds, cages, and circular tanks or linear raceways in both the United States and China. Monoculture dominates in the U.S., while both monoculture and poly-culture with traditional species such as carp occurs in China. Formulated feeds are employed in both nations. The details presented below refer to channel catfish culture in the United States of America.

The market has been impacted by an influx of unrelated species of catfish from Viet Nam in recent years. This has led to intense competition with domestic channel catfish in the marketplace to the extent that prices paid to many producers do not offset production costs. Predictions are that some producers may be forced out of catfish farming, though legislation to require country of origin branding may provide some relief. Country of origin labelling may aid in moving retail grocery stores and restaurants towards a preference for domestic catfish. There is also a movement by the catfish farmers to encourage legislation that would place a tariff on imported catfish. Prices in the marketplace are fairly stable.

While the catfish industry is quite mature, research continues on disease control, nutrition, genetic improvement, and other aspects associated with the farming of the species. Research is also being conducted to reduce the level of nutrients in pond effluents by developing diets that are better utilised by the fish.

The future of the catfish industry in the United States is unclear. Until the situation with respect to imported exotic catfishes is resolved, it is difficult to determine whether the industry will grow in the future, remain at its current level, or decline.

The market for channel catfish in the United States is well developed. Once considered a product of interest only in the southern states, catfish can now be found in restaurants and on menus in grocery stores throughout the nation. Consumers see it as being a healthy choice food. Market expansion may be possible through development of new product forms and value added processing.

Since channel catfish are produced almost exclusively on private land there are few environmental issues associated with production of the species. In cases where ponds or intensive culture facility effluents enter public waters, there is an issue of eutrophication that is being addressed, in part, through development of feeds that are better utilised by the fish. The issue of potential eutrophication also exists with respect to cage culture.

Source: www.fao.org

Read the magazine HERE.

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