^J 



Fig. 176. Stages in the development of the Salmon which may be followed in 

 rearing boxes at school. 



1, the egg ; 2, the egg just before hatching ; 3, the newly hatched salmon ; 4 and 

 5, stages of growth illustrating the gradual absorption of yolk ; 6, the young salmon 

 with yolk all used up ; only now does it commence to feed. From stage 3 to 6 

 occupies about six weeks. The small figures at the side Indicate the natural sizes 

 (y.s. = yolk sac). 



333 



