The scorpion, decaying skeleton, mosquitoes, a pygmy barracuda, a swamp leach, a giant swamp leach, a barracuda, and an Iksar outcast are all found in a secret tunnel in Cabilis East. I strongly recommend hunting there in the low levels, especially if you are a monk. You can bank and sell right outside this tunnel. The way you get in it is you jump into the water. Then you swim to the east end of the lake. You should find a tunnel there with barracudas and pygmy barracudas. In this tunnel you will find I believe 5 different places you can jump up and fight. Jump out of the water in the fourth one. Then follow a one way path till you reach the fifth one (you cannot jump into the fifth one for some reason). Here you should find the room. There is another secret room if you walk into one of the walls. When you want to sell/bank, just jump into the water and swim out.
They are there I have killed a few... They are found in the Tunnle thing on the left. If you have no idea what i am talking about try swimming all the way around the edge of the water in East Cabilis - in the big area near the bank. There is a big long tunnel they swim along, with the normal barracuda as well. It ends in a spot with low lvl NPC's like decaying skele's.
Good hunting 11th whatchamakallit Necromancer Ratax
If you want an unending spawn (and I mean back-to-back-to-back-to-back) go to pos 580 neg 980 neg 25 in the underwater tunnels (east side of the harbor).
Great....good for you. Now maybe some one can post something useful....like where in the hell you find one of these things, because I swam all over, and didn't see a single one.