Putting several conibear 330s in the output of my pond that feeds in a larger creek is where I catch the most otters. They tend to use it to access the pond. I also put a few on the slides they use once the get in the pond. I've been pretty successful in catching them. If one gets in the pond I can usually shoot them if I put in some effort. Had one sneaky one that managed to last about a month this fall. I'd see him chasing fish underwater but he would rarely surface. Finally got him in a trap.