Otters inhabit are streams and lakes.
The only time they become a nuisance seems to be when home owners stock ponds with fish or ducks or in commercial fish ponds that raise fish. It is in these cases that they have to be relocated as they can quickly wipe out the ponds duck or fish population. Bait with fresh fish and otter lure. Otter like fresh food, so if you want to catch an otter in a live trap you are going to have to be patient and replenish with fresh fish until you lure the otter in the live trap. Sometimes otter may take several days before they travel thru your area again.