A more thorough explanation:

Definition: Common of fishery is a legal right that allows a person to fish in waters on another person's land. It is also known as common of piscary.

Example: If a person owns a piece of land that has a river running through it, and they grant their neighbor the right to fish in that river, then the neighbor has a common of fishery.

This example illustrates how common of fishery works. The landowner has given their neighbor the legal right to fish in the river on their land, even though the neighbor does not own the land. This is a common right that is granted to the neighbor.