Anicricaii lushcrics Society 99 



CONCLUSIONS. 



Reviewing the results of the xarioiis tests and measure- 

 ments, we find the following axerage increases in the size of 

 the se^'eral species : 



Whitefish 15 i)er cent 



Pike perch 8 and 11 per cent 



Chinook salmon 11 per cent 



Brook trout 5 to 10 per cent 



Blueback salmon 9 per cent 



Lake trout 6 to 14 per cent 



Landlocked salmon 1 per cent 



Rainbow trout 



Lobster eggs apparently increase in size more than any of 

 the fish eggs tested, the figures being 13 and 20 per cent for 

 the period of incubation exclusive of the final swelling just 

 prior to hatching. 



In presenting these figures, preference of course is given 

 to actual count. Measurement In- water displacement is 

 doubtless second for accuracy, and is recommended as 

 against the von Bayer gauge, for the reason that the latter 

 depends for its accuracy u])on unifoimity in the spherical 

 outline of the egg, whereas indi\idual eggs of all species \ar_\- 

 in this respect and there is often further \ariation when the 

 eggs are out of water, due to softness or \veakness of the 

 membrane. The graduated scale or stick, a])])lica1)lc only to 

 jars of eggs, and the measurements l)y weight ha\e not l)een 

 specially considered here, pro1)al)ly ])eing less accurate than 

 the (jther methods mentioned. Aside from actual count true 

 determinations w^ould perhaps best be made with a micro- 

 meter applied to eggs which ha\'e been carefully treated w ith 

 proper killing fluids, their normal size and shape being thus 

 preserved. This method, however, is not ordinarily within 

 the reach of practical fish culturists. 



With due allowance for inexactness, the figures obtained 

 establish one important fad — namely, that after water 



