The exportation of wild-caught cardinal tetras from the Rio Negro (Brazil), is actually
helping the local ecosystems and people. Instead of cutting down trees, mining, and ranching, locals harvest these fishes. Cardinals (in the wild) are annuals, meaning that the adults die off every year, that and their extreme numbers make the current ornamental fishery sustainable. The fishing season correlates with their life cycle, (after they breed), so it surprisingly dosen't affect the ecosystem much. Plus, the flooded forest where the cardinal lives is too shallow for anything but canoes and people with hand nets, which prevents mass collecting. This is the work of Project Piaba (slogan: "Buy a Fish, Save a Tree"), a conservation group in Brazil (
www.angelfire.com/pq/piaba), I am going to the Amazon with them in January.
To boycott these fishes would be to persuade the Brazilians to find more lucrative means of income (timer harvest, strip mining, cattle ranching, slash and burn farming, illegal wildlife trade, etc.).