Quote Originally Posted by RedPearl View Post
"It could be from disease, a parasitic infection, incompatible water temperatures, pollution or a combination of factors, Pérez-Fuentetaja said."

Translation: We don't have a clue. It might even be an off year due to mother nature. But let's put part of the blame on man-made structures that have been there for how long, and only recently has there been a problem.
Your right Red they don't have a clue