AT THE PLYMOUTH LABOKATORY. 



309 



within two days after the latter date may be attributed entirely to bad 

 cases of fungus, and its attendant disease, too far gone to remedy, and 

 apparently no ill effects resulted from this early return to sea water 

 beyond a falling off in feeding for a few days afterwards. 



Growth. — As previously stated the weight of the smolts when they 

 were brought to the Laboratory in February and March, 1906, may 

 be placed at 4 to 5 oz., and the length at 8 to 10 inches. On September 

 28th, 1906, one fish, taken as representing the average, weighed 1 lb. 

 8|- oz., and measured 16 inches in length. On November 26th, 1906, 

 twenty-seven fish were weighed prior to spawning, but not measured. 

 The weights of these fish were as follows : — 



It is remarkable that the above weights give an average which is 

 exactly the same as the weight of the fish selected for trial on 

 September 28th, viz. 1 lb. 8|- oz. It is quite conceivable that this 

 particular fish chosen on that occasion slightly exceeded the true 

 average, but it is evident that the average increase of weight in the 

 two months' interval must have been very small. On the same 



