TROPICAL AQUARIUM FISHES 231 
by the edge, bring the water as high as possible in funnel, place female 
fish in funnel and cover over with screen. The wire will prevent the 
mother fish from becoming jammed in the outlet, but will allow the young 
to pass through and collect in the lower portion of jar. 
Very excellent breeding glasses come from Germany. These have 
a long narrow slit in the bottom and may be hooked on the inside of any 
receptacle. See Fig. 177. 
Spawning Net. In the spawning season aquarium space is often 
limited, particularly among amateur breeders who have perhaps a single 
aquarium. The breeding fish should be separated from the others, as the 
idle fish would eat the spawn. An easy way over this difficulty is the 
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Fic. 178. Spawninc NET 
use of the spawning net. This is simply a square bag of cheesecloth sus- 
pended in the aquarium. Figure number 178 will clearly show how this 
may be done. The four corners should be weighted down with bits of 
lead or stone sewed in. The plants and spawning fish are simply trans- 
ferred into the net. Confined in this comparatively small space the 
chances of the eggs becoming fertilized are increased, while the netting 
is sufficiently open to allow the aquarium water to flow slowly through 
it and prevent suffocation. In this way the large amount of dirt usually 
stirred up in an aquarium at spawning time, and which can do the 
adhesive eggs no good, is entirely avoided. The size of the net will 
depend somewhat on the proportions of the aquarium, but the capacity 
