Humans have always depended on marine life for part of their food consumption, and during most of history this marine life grew faster than humans could consume it. However, the last half century has seen such an increase in marine catch (overfishing) that the numbers of many species are not being replenished. This increase has been due to a higher world population coupled with technology that enables fishing vessels to locate and land fish like never before, The boats must now go farther offshore, which increases fuel consumption at the same time that fuel prices are rising. One factor countering the overfishing has been the rise in aquaculture, or “fish farming.” (The 2012 global revenue from commercial fishing and aquaculture combined was about S370 billion.) The catfish industry in both the United State and Vietnam has been part of the aquaculture revolution. In other words, rather than being caught in the wild in nets or hooked on fish line, cat fish are grown in ponds and harvested when they grow to a certain size. As this change has taken place, the catfish have ceased to be traditional scavengers; instead, they are fed corn and soybean feed, Catfish growers in the United States,in turn, have publicized the feeding change to promote sales to consumers who do not want to eat scavenger fish.