it is price and demand... These fisherman would love to say it came from the correct river to get more money out of a "high quality LEO". just sayin that we dont ever "KNOW for sure"
If you have good exporters you will. The rivers are also miles apart from each other. Fisherman fishing in the xingu are miles from Bd land(the river name escapes me right now). The exporters want continued buisness so why try and deal with a fisherman that doesnt fish in the same river as the BDs. Also they only let were letting out a quota of rays. This means all the exporters want rays from the specific river that Bds come from as they fetch higher price tags. I am assuming this had something to do with why they are now on the Ban list again. To many people taking from the same river.