FOOD 39 



example pools of 400 to 500 gallon capacity. Their cul- 

 ture involves the addition of manure, hay or dried 

 yeast to the water and then innoculating with a cul- 

 ture of either D. magna or pulex. Daphnia may also 

 be reared indoors in large tanks. Indoors it is more 

 convenient to use dried yeast or bone meal. The tanks 

 should be aerated and kept at a temperature of about 

 70° F. One should guard against adding too much 

 food material. 



Brine shrimp (Artemia salina) are hatched from 

 eggs obtained from supply houses. The eggs are avail- 

 able in large quantities at reasonable cost. The shrimp 

 eggs are placed in salt water (eight tablespoons of 

 salt per gallon of water ) maintained at a temperature 

 of 70° to 80° F. and aerated. In one or two days they 

 hatch and are ready to be utilized. Several containers 

 of brine shrimp hatching in sequence will produce a 

 dependable supply of live food for small fish. This is 

 a good food and in most cases a more dependable 

 source of this size and type than Daphnia. Brine 

 shrimp are attracted to light and may thus be sepa- 

 rated from unhatched eggs. Microcrustaceans may 

 be concentrated for feeding by use of a dip net or 

 strainer made of ladies nylon hose. 



Tubifex worms (Tubifex tubifex) occur in ex- 

 tremely dense populations at the water's edge of 

 ponds and rivers which are polluted with sewage or 

 some other concentrated organic matter. These an- 

 nelids are approximately one inch in length. They are 

 excellent food for most fishes. Tubifex can be dipped 

 up with mud in which they stay partly buried. The 

 mud can be washed away and the worms acciunu- 

 lated in pure form. 



