http://www.fishobserver.com/aquariu...ide-for-aquarium-keepers-and-researchers.html Would be interesting to see if this study was ever conducted, and if so what results came from it.
I think the main concern for banning rays in CA (and other states) is the public health threat. There is certainly plenty of evidence of it in the Amazon Drainage.
I'm not familiar with the habitats of springs in CA, but have seen a few in FL. As I remember, they appeared to be rather sterile environments. I'm not convinced fw rays could become established and thrive in these environments. Stable water temperature year round would certainly benefit rays in spring habitats, but what about rivers and lakes in CA that potentially drop below the prefered temperature range of rays?
Again, keep in mind the reproductive mode of rays.
I think the main concern for banning rays in CA (and other states) is the public health threat. There is certainly plenty of evidence of it in the Amazon Drainage.
I'm not familiar with the habitats of springs in CA, but have seen a few in FL. As I remember, they appeared to be rather sterile environments. I'm not convinced fw rays could become established and thrive in these environments. Stable water temperature year round would certainly benefit rays in spring habitats, but what about rivers and lakes in CA that potentially drop below the prefered temperature range of rays?
Again, keep in mind the reproductive mode of rays.