When you do trap them (otter) make sure it's in a 330. They are a buggar in a foothold if not a drowner set up. Osky
IMO a 330 size trap is a poor choice for otter unless it is fully submerged.
For fast moving otter’s a 330 size trap quite often closes on them to far back. My experience with the smaller 280 is that it closes faster and results in fewer, if any, poor catches. The 280 will also capture more of the incidental mink and muskrats that often trigger 330 beaver and otter sets without getting caught. Thus, it is the ultimate otter trap IMO.