163 Brown ‘Trout 
minutes she turns on her side with a flopping motion (Fig. 158), 
and during this time deposits the spawn. The male is generally 

FIG, 159.—Trout spawning-bed, showing the gravel heaped up. 
beside her throughout the process of spawning, which usually occupies 
from two to four days, according to the nature of the water and the 
