CuHapter XVII. 
PROPAGATION. 
Among fish culturists it is the universal custom to divide fishes 
into two classes according to the season in which they spawn; we 
thus have summer spawning and winter spawning fish. They are 
further more distinguished as they differ in the mode of depositing 
the eggs, as some are laid on or in receptacles usually called ‘‘ nests,” 
especially prepared by the fish for that purpose, and others again are 
dropped loosely into the water without any precautions having been 
taken for their protection. In the latter case they again differ in 
being either ‘‘adhesive” or ‘‘ non-adhesive,’ in the one instance 
adhering to anything they may happen to touch and remaining until 
hatched, in the other sinking to the bottom or floating about at 
random on the surface. 
The goldfish belongs to the summer spawning class, builds no 
nest and its eggs are adhesive in the full sense of the word. In those 
fish depositing non-adhesive eggs, the extrusion of them by hand, 
and their artificial impregnation is profitable, but with the carp-like 
fishes, a higher percentage of young is obtained when the spawning 
is allowed to proceed in its natural manner. Besides, their eggs not 
being mature all at the same time, would make the operation of 
extrusion an oft-to-be repeated affair, and which, furthermore, would 
greatly endanger the life of the fish and require much time and 
attention. 
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