190 



BULLETIN OF THE BUREAU OF FISHERIES 



In April of that year Calanus was more evenly distributed, with the coastal belt 

 supporting about as many per square meter as the basin, but with three circum- 

 scribed centers of abundance — (1) from Cape Cod out over the western basin (sta- 



400 - 



600 

 500 



Fig. 64. — Numbers of the copepod Calanus finmarchicus per square meter of sea area, February and March, 1920, as calcu- 

 lated fron the vertical hauls. The single hatched curve incloses the area where there were usually upward of 1,000; 

 the double hatched curve upwards of 100,000 



tions 20114, 20115, 20116, and 20117), (2) in the northern channel (station 20105), 

 and (3) on the eastern peak of Georges Bank (station 20108) — reminiscent of the 

 local March swarm. From April on reproduction of Calanus takes place so much 



