FOR PLEASURE AND PROFIT. 141 



eggs ; for, although Byssus only attacks dead eggs, its growth 

 from them in all directions is very rapid, and surrounding 

 eggs are soon covered. Therefore, I repeat, remove all 

 white eggs at once, and no trouble will arise. But there 

 is a worse danger than an attack of Byssus to be feared, if 

 constant care is not exercised; this is an attack of fungus 

 proper, Saprolegnia, which spells disaster wherever it occurs. 

 As prevention of even this is possible, on no account neg- 

 lect the precaution. I must also impress upon all 

 the vast importance of subdued light only being admitted 

 to the hatchery. 



Having advanced the eggs to the hatching stage, our next 

 consideration is the care of the alevins and young 1 fry. 



