Since I received the reply from Omega One, I have found a few articles on the species "Brachyrostralis" and it appears that they are an "ice fish" native to the Yangtze River of China. The only references I can find to the species are Chinese. I find it very strange that there is so little information on a fish that is mass sold across the world. Could it be possible that there is another name for them?

Nevertheless, I don't feel comfortable with this source of "silversides" and will continue to be on the hunt for some of those other brands.