What CJB2003 said is correct. They are all based off the eurpean or German browns as they are called by the hatcheries around my area of Canada. There are a few different strains though of browns and some are better in the warmer waters. This strain I am trying this year is the same that is stocked in our rivers in the area for sport fishing. My local river (The Grand) has a world class brown trout fishery and is just 5 minutes down the road from my place. Last years browns I got were a strain that is more commonly stocked in the Great Lakes where the water is fridged all year long.