Check this out. If you live in New York, basically you have to pay the state to allow you to catch the fish you paid for and put in the pond you paid for.

http://www.dec.ny.gov/outdoor/7975.html

"Prior to stocking fish in your pond, you should obtain a Farm Fish Pond License from DEC. The license allows the licensee, his immediate family, and his employees to take fish at any time, in any size, in any number, and in any manner as stipulated in his license. The farm fish pond license also serves as a stocking permit, eliminating the need to obtain a separate DEC fish stocking permit which is required to stock fish into any waters of the state.

The Farm Fish Pond License is free and is good for five years. You can obtain an application for the license from any DEC Regional Office.

Pond owner's should be aware that the laws governing fishing require all persons 16 years of age and older must have a fishing license except citizen-resident landowners and lessees or members of their immediate families actually occupying and cultivating farm lands when fishing on such lands. This means that guests or friends of the pond owner must have a license to fish the pond even though it is privately-owned. Laws pertaining to seasons, size limits and daily take also apply to owners of private fish ponds unless a farm fish pond license is obtained."