i caught a small mouth on the detroit river hand lining it was 20 inches long ,had no scle in the boat any body have any idea what that would hve wieghed

On the eastern end of Lake Erie we have a 20 inch size limit during the early season.  Tournaments during this time I have seen 20" fish go anywhere from 4 1/2 to 6 1/2 pounds.   I set a club record a few years back at 6.42 pounds and it measured 20 1/8".   

Next time you catch a fish measure the length and the girth. That way you can use the weight calculator in the tools toolbar on top of this page. You`ll have a better idea how much it weighted.

thanks guys. never seen one that big.

Great Catch! River fish tend to be alot leaner than lake fish so I'm thinking 4-4.5lbs unless it was incredibly fat.