Sturgeon and Paddlefish – US & Canada 
The wild Sturgeon populations of the U.S. and Canada are suffering from overfishing and habitat degradation. Because these species are long-lived, and little is known about habitat requirements, recovery will be slow. Management is weak because coordination of management agencies is poor, and there is insufficient data on populations to determine sustainable catch levels.
This fish may have high levels of mercury and PCBs that could pose a health risk to adults and children. More mercury and contaminant info here.