l)i"i'e(lcr is tn (le\isc \va}s and means to insure an abundance of such food. To tliis end special 

 waters must he a\ailable for tlie collection and retention of such creatures, and special efforts must 

 be made to encourage tlieir growtli in tlie goldfish ponds. 



The nidst striking feature of goldfish culture as practiced b\- the Koriyama scliool is the great 

 amount of effort and time dexoted to the collection and artifici;d production of crustacean food. 

 This subject of couise receives attention at Tokyo and elsewhere, hut is less characteristic and in 

 general mucli less elaborately worked out than at Koriyama. 



The simplest method of pro\iding these small crustaceans is to collect them in open waters — 

 reservoirs, ditches, ])onds, streams — if the culturist has con\enient access to such. The usual col- 

 lecting grounds are the reservoirs for the irrigation of rice lields, in which the conditions are 

 very faxorable for the existence of tJiese creatures. Many are produced also in the nuul p(jnds. 



The enterprising breeders, howex'er, do not depend mi the natural growth nf "miiinko." but 

 resort to artificial measures for maintaining a constant supply. This work is scarcely less note- 

 worthy than the cultivation of the goldfish themsel\-es, and is perhaps the most remarkable featr.re 

 of this industry, for the Japanese have gone far ahead of other jieople in this important branch, 

 As Professor Mitsukuri has said, "the Japanese goldfish breeders ha\'e the knack of producing 

 these water fleas in any quantit\- the\- need at an\- time they like." 



The essential point in the cultivation of "mijinko" is the fertilization of the pond, so that 

 the growth of the minute animals and plants that ser\e as the immediate or the ultimate food of 

 the crustaceans may be greatly stimulated. Gi\-en an abundant food supply, the little crustaceans 

 W'ill multiply with astonishing rapidity and soon acquire a Imlk which in the aggregate is very- 

 considerable. There are several ways of fertilizing the mud ]jonds. Reference has already been 



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