166 



Puget Sound Marine Sta. Pub. 



Vol. 1, No. 14 



Considering table 4, which is concerned with shrimps alone^ we note 

 that the shrimps of each species which were collected in shallowest water 

 live longest in the fresh water. It will also be noted that the shrimps 

 commonest in the shallower depths live for a longer time than those 

 commonest in deeper water. 



Table 4. Showing the resistance of shrimps of the same and different 

 species from differenth depths, to fresh water. 



Scientific Name and Common Name 



a 



o <! a> 

 So 



?3 



cy 

 ^o 



d 



CD fiS jj-W 

 (t> '—«.'* 

 T 3 O ^ 



& 



3?g 



Ml 



M 3 



Pandalus danae Stimp 



Coon-stripe shrimp 



Pandalus stenolepls Rath, 



Deep coon-stripe shrimp 

 Pandalus borealis Kroy 



Pink shrimp 

 Spirontocaris lamellicornis Dana. 



Crested shrimp 

 Spirontocaris polaris Sab 



Red-ringed shrimp 

 Crangon alaskensis Lock 



Frisco slirimp 

 Crangon munita Dana 



Saddle-back shrimp 



Crangon communis Rath 



Paracrangon echinata Dana .... 



Spiny shrimp 



4-146 P. J 



52-250 R. 

 40-165 P. 

 60-700 R. 



18-130 R. 



.|' 20-425 R. 



10-40 R. 



22-105 R. 

 15-80 P. 

 40-600 R. 

 25-96 R. 



I 15 



2 



I 1 



I 



I 1 



I 



I 5 



I 



I 1 



4-6 



12-20 



30-50 

 100-140 

 135-165 

 100-140 



36-80 



100 



I 



I n5-165 I 



25 

 23 

 13 



7 

 7 



24 

 2 

 2 



10 

 3 

 5 

 2 



14 

 15-20 

 15-20 

 35-75 

 90-140 

 40-100 



I 140-165 



85 

 I 120 

 54 

 24 

 10 

 25 

 6 



Experiments with crabs (table 5) showed results similar to those 

 shown by the shrimps (table 4). The method employed in the work on 

 crabs was slightly different as the crabs are more hardy but cease all 

 noticeable activity in the fresh water and still often recover after being 

 returned to the salt water. Thus as the table shows the crabs were put 

 into the fresh water for the period recorded and then returned to the 

 salt and the number dead and recovering noted as given. In general 



