Thanks for the info esshup and poppy65.
I'll be trying that coating on the YP soon..
Poppy65, you are making me nervous about stocking the HBG. I was hoping they wouldn't reproduce, and if the experiment of having them in with my YP, SMB, and RES would be controlled. If it didn't work out, I thought once I had caught them, it would be over. Trapping offspring wasn't what I was hoping for. Oh well, we shall see.
I had a possum get in the live trap the other day. I've been catching all coons until now. Well he managed to Rick the trap down I to the water. When I pulled it out it had two HBG in it! I guess they were going after the possum. That is aggressive!

12 yr old pond, 1 ac, 15' deep.
RES, YP, GS, FHM (no longer), HBG (decreasing), SMB, and HSB (only two have been seen in 5 yrs)
I think that's about all I should put in my little pond.
Otter attack in 2023.