192 GROWTH OF SALMON-FRT. 



like a hairless caterpillar, or fringed larva of about 

 three quarters of an inch in length, and tapering 

 from head to tail, having a small sac attached to 

 it, near the throat, about the size of, or rather 

 less than, the original ovum, or single pea or 

 spawn. This sac is the remains of the incubated 

 ovum, or egg, and still, no doubt, contains vitel- 

 line, or matter equivalent, for the sustentation of 

 the infant salmon. In connexion with the sac and 

 incipient fish, several conduits, or veins are visible. 

 The sac remains attached to the imperfectly formed 

 fish for about a month, and is detached or con- 

 sumed by degrees. The gradual detachment may 

 be observed in a specimen of twelve days old, for 

 at that age it will be seen that the sac has visibly 

 decreased in volume, though it has not as yet be- 

 come undetached, or entirely consumed. 



At a month old the fish-foetus has grown in 

 length, and exhibits to the naked eye plain traces 

 of head, eyes, and tail. Still it is barely more 

 than a pale, misshapen, little longitudinal, half- 

 animated, substance. 



At two months old the "fry" measures about 

 one inch and a half, is of nearly perfect piscine 

 formation, having all its fins well defined, and on 

 its coat a slight appearance of transverse bars, com- 

 monly and erroneously termed " parr marks." In 



