A brook trout, a freshwater fish found in cool streams and lakes, popular with anglers.
Informal diminutive of 'brook trout,' using the suffix '-ie' to create a casual, colloquial name. The term became common among fishermen in the 20th century.
In fishing culture, diminutive names like 'brookie,' 'bluegill,' and 'smallmouth' are so universal that many anglers don't even know the formal scientific names—it's a parallel language of sport.
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