Caledonia Fish Hatchery, also known as “Spring Brook” and the Seth Green State Hatchery, is a historic fish hatchery and national historic district located at Caledonia in Livingston County, New York. The district encompasses five contributing buildings, one contributing site, five contributing structures and two contributing buildings associated with the oldest fish hatchery in the Western Hemisphere. 

It is still in use by the state of New York and named for Seth Green (1817-1888), an American pioneer in fish farming and who established the hatchery in 1864. It was listed on the National Register of Historic Places in 2015.

Over the years, the Caledonia Fish Hatchery has evolved into a multifaceted center for fish conservation. Its core function remains the propagation of native fish species like Chinook salmon, steelhead trout, and rainbow trout. The hatchery utilizes sophisticated techniques to raise healthy fish from fertilized eggs to fingerlings, a critical stage in their development. These fingerlings are then released into carefully chosen streams and lakes, restocking depleted populations and restoring the ecological balance.

Beyond its role in fish propagation, the Caledonia Fish Hatchery actively contributes to fisheries research and education. Hatchery staff conduct vital research on fish biology, habitat restoration, and the effects of environmental changes on fish populations.

According to iloveny.com; en.wikipedia.