Rainbow trout are Cold water fish that have long been symbolic of mountain streams and lakes in North America. Because of their ability to thrive in hatcheries, rainbow trout has been introduced into much of the United States and now inhabit many streams and lakes throughout the country. The popularity of rain-bow trout among anglers has placed it among the top five sport fishes in North America, and it is considered by many to be the most important game fish west of the Rocky Mountains. The Parks and Wildlife have done an excellent job over the last two years to bring Grand Lake's Rainbow trout population's to good numbers. Any removal of nutrients from Grand lake could effect all the work and time put in.