I have caught both otter and beaver in traps set on a half submerged log, a place which makes an ideal set on waters that are liable to vary in height, as the log moves with the change of height and the trap is always in order. Another good place for a trap is on a floating island when such can be found, but these favorable places are not always obtainable. A beaver or otter will be caught in deeper water in the spring than in the fall. In the spring they swim about with more vigor and consequently displace more water in front of their breasts, their feet thereby, setting off the pan in what would at other seasons be too deep water.
A piece of castorum is the general lure used by most trappers for the animals I am treating of. In fact castorum is used for almost any animal. But a stronger "draw" for beaver or otter is a drop or two from the scent bag of the animal. The contents of this sac can be emptied into a small vial and carried about in the trapper's pocket to be used when required.
A small twig dipped in this and stuck in the bank back of the trap will cause any otter or beaver swimming past to come straight for the trap, regardless of consequences.
In setting a trap for these animals care must always be taken to douce all about the trap before leaving. This can be done from the canoe or boat by flipping water with the flat of the paddle. A difficulty in setting spring traps is the planting of a picket to hold the trap. The banks are generally frozen even for considerable distance under water, and driving a picket or stake is impossible. One good way to overcome this condition when procurable is to fasten the trap chain to a good sized flat stone. Have a wire from this to the shore tied to some willow or root, and if anything is caught, with the wire you can drag everything ashore.
When stones are not to be procured a young spruce can be cut ten or twelve feet long of a size at the butt that the trap chain ring will pass over. Leave a good tuft of the head branches, removing all the rest down to the butt. The ring thus being assured of a clear run down to the tuft, the trap is set and the end of the pole made secure to the bank either by a piece of wire or by a cord. If the latter, care must be used to tie close down to the prong and the cord carefully covered with mud or something else to hide it from rabbits or other animals that would surely gnaw, thereby endangering the loss of your trap and animal.
Trapping, like everything else, to make it a success, must have proper attention. A man who sets a trap haphazard and visits it only occasionally cannot expect to be very successful.
SALT SET.
I use both the bait and blind set; the water set I think is the best, that is, in bitter cold weather when the ice is thick. My way of making, I call it the ice set, writes an interested trapper, is to take a piece of oil cloth or an old buggy top cover will do, and put about 5 pounds of salt in same and sew it up, having it about 2 inches thick. Don't make it too solid, leave it loose enough so you can work the most of the salt around the edges to bed the trap in.
Now puncture with a needle to let the fumes of salt through; cut a hole through the ice at edge of the water, scrape out hole to bed salt in; but first put a stone in the hole and bottom and side it up with stones to keep the mud from clogging the needle holes. Now you will wonder what the salt is for; simply to keep the ice from freezing the hole shut. I had nine of that kind of sets last winter and trapped 7 mink. The hole will never freeze shut. Always set trap under water.
Last winter I told my better half that I had better take my traps out of the run where I trap, as I couldn't make a water set, because they froze up over night. She said, "Why don't you put salt around your traps?" That put me to thinking so I got an old piece of oil cloth and got her to make four bags for me on the sewing machine; I put a sack of salt, 5 pounds in each one, and used them as I have described.