I know it's hard to protect everything, but there's solar powered electric fence chargers for less than $100 on e-bay. Gotta use them around here for new orchards to protect the seedlings from the deer.

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).