BIGELOW: EXPLORATIONS OF THE COAST WATERS. 



31' 



the same (Fig. 95), except that the region nortlnvest of Cape Cod was 

 rehitively less productive. 



The hauls for the past three years show that copepods must l>e by 

 far the most important summer food for pelagic fishes in the Gulf of 

 Maine. But the number of these animals as a whole is not a fair 

 index to the fertility of different regions as feeding grounds, l)ecause 



Fig. 95. — Copepods per cubic meter, July-August 1914. 

 4, rich 900 + 



3, intermediate 200-900 

 1, scanty less than 200 



of the great difference in size between different species; one large 

 Euchaeta or adult Calanus, for example, being equivalent to many 

 young Calanus, Pseudocalanus or Temora, (Farran, 1911). Large 

 Calanus were abundant (30,000+) per square meter over the whole 

 western and southwestern parts of the Gulf, extending northeastward 



