Data on total weight and standard length of freshwater bream and perch. two of the most abundant fish species in the Volga River basin. were collected monthly from April 2016 to May 2017. Fish were caught using gill-nets with 50 and 80 mm mesh sizes. https://www.bekindtopets.com/quick-find-ICON-39290-Adjustable-Track-Bar-Kit-1999-2004-F250-F350-flash-buy/