REPORT OF COMMISSIONERS OF INLAND FISHERIES. 



199 



of the United States Fish Commission at Woods Hole, due to the 

 much lower temperature of the water prevailing in the latter region. 

 This fact is shown by the following table: 



Table No. 21. 



Showing the effect of temperature upon the rate of development of lobsters in 

 the first three stages at Woods Hole. 



Experiment. 



Duration of the First Three Stages. 



Average 

 Temperature. 



1 

 2 

 3 

 4 



25 days. 

 21 days. 

 25 days 

 23 days. 



60.0° F. 

 59.5° F. 

 60.0° F. 

 59.8° F. 



Dannevig ('01) has found also, in his experience with the European 

 lobster, that alterations in the temperature of the water make great 

 differences in the frequency of the molting periods. From him we 

 translate the following to demonstrate the influences of water tem- 

 perature upon the rapidity of the first two molting processes during 

 a period of 9 days : 



Water at 8-10° C, no molts. 

 Water at 12° C, one molt completed. 

 Water at 14° C, second molt begun. 

 Water at 16-22° C, second molt completed. 



The following table demonstrates the difference in the rate of 

 growth of lobsters at different points on the Atlantic seaboard: 



