CHAPTER XIII 

 HATCHING FISHES' EGGS IN JAKS 



THE national and state institutions hatch in 

 glass jars the bulk of the hundreds of millions 

 of fish which they plant every year. The eggs 

 of nearly all fresh-water and anadromous 

 fishes, excepting the trouts and salmons, are in- 

 cubated in this manner. No discovery yet 

 made in fish-culture has equalled that of the 

 hatching- jar. It has made possible fish-culture 

 in such huge proportions that the work to-day 

 is bounded only by the size of the hatching- 

 plants and the amount of money available to 

 secure eggs; and it has enabled national and 

 state governments to take up "field work" on 

 a scale commensurate with its importance, and 

 through it to save and hatch the almost count- 

 less millions of eggs of ripe fishes caught in 



nets by the commercial fishermen which pre- 

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