The record of biggest freshwater fish ever caught goes as far back as 1966 when Dana Deblois caught a 19 pound, 10 ounce brown trout in the Wachusett Reservoir in Worcester County. As for western Massachusetts, the biggest fish ever caught and recorded was a 27 pound tiger muskellunge in 2001, caught by James Lambert. Here are the records for largest freshwater fish ever caught in the Commonwealth.