Fig. 35. Overflow apparatus for counting fish eggs and brood, 

 egg pipette and egg pincettes for sorting out dead eggs. 

 For counting eggs or brood the apparatus is filled to overfloTdng with 

 water. After the water flow stops, a measuring cylinder is placed under 

 the overflow tube, and the water running off from the filling of eggs 

 and brood is measured. A soldered-in sieve prevents the entry of brood 

 in the overflow tube. 



Fig. 3d, Brook trout fry capable of eating and swimming. 

 About 150-200 day-degrees after hatching, 2U mm. length. One 

 third of the vitelline sac remains. 



120 



