CULTUEE OF YELLOW PEECH 197 



The average spawning-period of the yellow 

 perch is from twelve to fifteen days, although, 

 as with the eggs of all other fish, the time may 

 be shortened or lengthened according to the 

 rising or lowering of the temperature of the 

 water. 



Yellow-perch Fry. Newly hatched yellow 

 perch are minute and almost colourless, and can 

 scarcely be seen in the water. Their yolk-sac 

 is not heavy, so that they swim freely almost 

 from the moment they emerge from the egg. 

 On account of the tiny size of the newly hatched 

 fry the out-flow of the tank into which they are 

 carried from the battery must be screened with 

 some very finely meshed material, as copper- 

 gauze wire or cheese-cloth. 



The absorption of the yolk-sac and early 

 growth of the yellow perch are very rapid, and 

 by the end of a month the fry will be a sturdy 

 youngster nearly an inch long and schooling 

 with thousands of his kind in shoal water ; and 

 by the end of the year under favourable con- 

 ditions he will be four or five inches long. 

 After that the growth, as with most other 



