operates the net, drawing it slowly through the water and gradually accumulating a mass of water 

 lleas and in addition insects, plants and various other kinds of material which must he separated 

 from the crustaceans. 



As man_\- species of entomostraca are entirely too large for the mouth and stomach of the 

 goldfish fry, it is necessary to sort them according to size, and this procedure is required during 

 all the stages of the fry period. The separation of the crustaceans into sizes adapted for the 

 different sizes of the fry is accomplished by means of sieves, of which 5 sizes are used, having 

 respectively 130 meshes, 100 meshes, 80 meshes, 60 meshes, and 20 meshes to the inch. The sieves 

 are 10 to 15 inches in diameter, and have either wire or cloth bottoms. Besides separating the 

 crustaceans, they serve to exclude foreign matter in the water; and the coarsest kind is used mostly 

 to exclude injurious insects that may Lie in the plankton. 



Other Foods ami their Preparation 



When entomostracans can not he supplied in sufficient quantities and of proper sizes for the 

 young and mature fishes, it is necessary to provide substitutes drawn from the animal and vegetable 

 kingdoms. In some special cases, certain of the other foods appear to serve a mosl useful purpose 

 and are more or less regularly employed, but as a general thing the substitutes are of decidedly 

 inferior value. 



Mosquito larvae are acceptable food for older fish and, when cut up, for young fish as well, 

 and they are often given. In the culture of the ranchu at Tokyo the brood fish for 10 days prior 

 to egg-laying are freely fed with these insects, which may he collected in almost unlimited numbers 

 in stagnant waters in all parts of the country. 



65 



