• growth rate;
  • counter gradient variation

Growth rate coefficients estimated for channel catfish Ictalurus punctatus, emerald shiners Notropis aherinoides, freshwater drums Aplodinotus grunniens, river carpsuckers Carpiodes arpio and saugers Stizostedion canadense collected in 1996–1998 from nine river sections of the Mssouri and lower Yellowstone rivers at two life-stages (young-of-the-year and age 1+ years)were significantly different among sections. However, they showed no river-wide latitudinal trend except for age 1+ years emerald shiners that did show a weak negative relation between growth and both latitude and length of growing season. The results suggest growth rates of fishes along the Missouri River system are complex and could be of significance in the Management and conservation of fish communities in this altered system.