DIFFICULTIES OF YOUKG FISH. 113 



and are like drops of white barley-sugar. 

 This depends, I find, on the colour of the oil 

 globule in the umbilical vesicle being different. 

 Both kinds of trout are very much more 

 quick and active than the young salmon ; 

 when touched with the brush they jump up 

 instantly, like a hare from its form ; and 

 having (also like the hare) run in a ring two 

 or three times, drop down again to the 

 bottom. The form of the umbihcal bag of 

 the common trout is much more round than 

 that of the salmon, rendering it, therefore, 

 more difiicult for the fish to get rid of his egg- 



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case ; the little creatures often get their bodies 

 out of the Qgg^ but not their umbilical vesicles, 

 and this seems to annoy them much ; and I 

 have every day to lend a hand to lots of these 

 little fellows to enable them to make a decent 



