Abstract
Abstract We evaluated an electronic fry counter (Jensorter, Inc., model FC 2) for accuracy, precision, ease of use, and effects on survival of walleye fry (Stizostedion vitreum). Average electronic counts of fry differed from hand counts by no more than 4.9%; fry numbers estimated volumetrically differed from hand counts by 90.2% and from gravimetric estimates by 17.2%. Survival of electronically counted walleye fry after 66 h (96.7%) did not differ significantly (P > 0.05) from survival of fry counted by hand (97.1%), gravimetrically (97.4%), or volumetrically (97.8%). The electronic counter records debris as well as fry, so the water must be free of egg fragments, sediment, and other particles. With this constraint, the electronic counter was easy to use, faster than hand counts, and more accurate than gravimetric and volumetric methods of enumeration. Its effect on survival was low. The device may be useful for counting larvae of other species besides walleye.
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