Figure 6. — Spiny dogfish egg collected July 1961 in Ipswich Bay. Note the embryo, probably about 4 months old. 



West Coast of North America, Quigley (1928b) 

 reported 3 to 11 (average 7), Clemens and Wilby 

 (1961) reported 3 to 14, and Bonham est, al. (1949) 

 reported 2 to 17, mostly 7 to 8. Female spiny dog- 

 fish collected about 100 miles west of the Orkney 

 Islands contained 2 to 13 pups, with an average of 

 6.2 pups per female (Aasen, 1964b). 



In the Gulf of Maine, Bigelow and Schroeder 

 i L953) state that the number of pups per female 

 may be as many as 8 to 11, or as few as 2, but 

 mostly 4 to 6. Data collected in July-August 

 1961, in the inner Gulf of Maine (Ipswich Bay), 

 show the females may contain from 1 to 11 pups, 

 mostly 4 to 7. 



To examine the relation between the size of 

 pregnant female and the size and number of pups 

 Eel use.-) per female, I grouped the data by length 

 of females by 3-cm. groups (table 7). In addition 

 to the data for fetuses, the measurements and 

 numbers of embr3 T os are also included. 



The data suggest that the larger females tend 

 to have slightly more and slightly larger pups 

 than the smaller females. This, in general, agrees 

 with the reports from other parts of the range of 

 the spiny dogfish. A comparison between the aver- 



542 



U.S. FISH AND WILDLIFE SERVICE 



