John, they aren't endangered, they are "protected" under the 1918 Migratory Bird Treaty Act.

As for RBT, I have my best success catching them when the water temps are between 55�F and 68�F providing the O2 levels stay high.

www.hoosierpondpros.com

[Linked Image from lh6.ggpht.com]
http://www.pondboss.com/subscribe.asp?c=4
3/4 to 1 1/4 ac pond LMB, SMB, PS, BG, RES, CC, YP, Bardello BG, (RBT & Blue Tilapia - seasonal).