Length, weight, sex, gonad weight and maturity stage of Rutilus rutilus and Perca fluviatilis from the Ob River basin, Western Siberia

Excel file contains data on the total length, standard length, total weight, eviscerated weight, sex, gonad maturity stage, and gonad weight of roach Rutilus rutilus and perch Perca fluviatilis sampled in 2011 and 2012 in the Ob River basin. Fish were collected in 12 lakes and 2 rivers using gill-nets with 22 and 28 mm mesh sizes. Measurements for a total of 250 roaches and 274 perches are given.