Troutslayer97 give the following bait shop a call they should be able to tell you species of fish in Waneta Lake.
Fur,Fish & Feather 109 Debruce Rd. Livingston Manor,NY. (845) -439-4476
I do not know if the following shops are still in business, but worth a try giving a phone call.
Manor Sport shop 54 Beaverkill,rd. Livingston Manor (845)-439-3002
Betz's Sport shop route 28 Arkville (845)-586-3699
Steve