Fig. 27. Zuger Glass Incubator (Self Selector) for the incubation 

 of small fish eggs. Catchinc boxes (painted white inside and barred 

 by a hair sieve) are placed under the outflow for catching the 

 hatched brood. 



Fig. 28, Incubation Plant of a lar^e central German Trout Fishery. 

 Front right the filter, behind this the level trough. In the front 

 center undercurrent apparatus, behind this the feeding boxes. The 

 arrangement of the incubation houses is essentially similar. In the 

 background, a trout spawning pond. 



Fig. 29. Filtering arrangement of a hatch house. Front, 2 pre-filters, 

 behind 3 filters. 



113 



