Dp. Lemarie et al., EVALUATION OF AN ELECTRONIC FRY COUNTER WITH STRIPED BASS EMBRYOS ANDLARVAE, The Progressive fish-culturist, 59(1), 1997, pp. 71-74
We evaluated an electronic fry counter (Jensorter, Inc., model FC-2) f
or accuracy, precision, and effects on embryo hatchability and larval
survival of striped bass Morone saxatilis. Hatching success of embryos
and 96-h survival of 5-d larvae passed through the counter did not di
ffer significantly (P > 0.05) from controls. Mean electronic counts of
embryos and larvae differed from hand counts by -5.2% and -9.7%, resp
ectively. Precision was estimated by the coefficient of variation of r
epeated counts and ranged as high as 4.43% for embryos and 8.62% for l
arvae. Site- and species-specific factors may have increased variabili
ty that resulted in the reduced levels of accuracy and precision. The
advantages of greatly increased speed of counting and ease of use, as
well as potentially better performance under other conditions, warrant
further evaluation of this counter with other species and water suppl
ies.