Salmonid fishes viz. pacific salmon (oncorhynchus sp.) Atlantic salmon (Salmo sp.)
Trouts are grown in cold areas of world. Both pacific salmon & Atlantic salmon are Anadromous fishes and they need saline environment for growth.
But trouts can be grown in inland waters.
Contribution of salmonid to global aquaculture production of fishes is next to that of carps. Hundreds of hatcheries operate in several parts of cold areas of the world which are meant not only for providing stocking materials for aqua farms but also for stock enhancement in natural waters through ranching.
Hatcheries of oncorhynchus and Salmo sp.Are engaged in the production of smolt for farming and ranching.Trouts hatcheries are established in several cold regions of the world including India. In India trouts were introduced from other countries. Mahseer found in the cold streams and lakes are endogenous fishes in India.