I004 BULLETIN OF THE BUREAU OF FISHERIES 



The displacement made by the counted fish will be shown by a rise of 

 water in the glass tube above the zero point ; then by reading the number of 

 points to which the water rises the average number of fish per point may be 

 easily ascertained. To find the number of fish in an entire given lot, empty the 

 measure, replace the water to the zero point, put the fish in by the operation 

 above described, again read the number of points above zero, then multiply the 

 latter by the number of fish per point, previously ascertained. 



The measure should be held perpendicular, which may be accomplished by 

 suspending it between the thumb and index finger placed at the base of the 

 funnel. 



