(1) A foreign object (such as tool or pipe) lost in the borehole which obstructs routine functions performed in the well. Usually must be removed or by-passed.

(2) To attempt to retrieve the object lost in the well bore.

(3) A portable surface electrode, attached to the end of a line, making a remote ground electrical connection. The fish is usually placed in a shallow hole dug into the ground and filled with [[mud]]. Compare [[ground stake]].