Proposed standard-weight (W-S) equation and length-categorization standards for brown trout (Salmo trutta) in lentic habitats

We developed a standard-weight (W-s) equation for brown trout (Salmo trutta ) in lentic habitats by applying the regression-line-percentile technique t o samples from 49 populations in North America. The proposed W-s equation i s log(10) W-s = -5.422 + 3. 194 log(10) TL, when W-s is in grams and TL is total length in millimeters. The English-unit equivalent is log(10) W-s = - 3.592 + 3.194 log(10) TL, when W-s is in pounds and TL is total length in i nches. The equation is applicable for fish of 140-750 mm TL. Proposed lengt h-category standards to evaluate fish within populations are: stock, 200 mm (8 in); quality, 300 mm (12 in); preferred, 400 mm (16 in); memorable, 500 mm (20 in); and trophy, 600 mm (24 in).