NOTE Bilkovic et al Spawning of Alosa sapidissima and Moione saxatilis 



635 



Mattaponi 1997: American Shad Eggs 



30- Apr 

 16 Apr 

 ■Apr 

 29-Mar 



Mattaponi 1 998; American Shad Eggs 



_ May 

 May 



31-Mar 



Mattaponi 1999: American Shad Eggs 



^"Vo'9 7o^,98 

 94 



18-Apr 

 11 -Apr 



Pamunkey 1997: American Shad Eggs 



Stations (km) 



106 

 102 



'29-Apr 

 ;-K-g-ax^l7-Apr 



' ^^'JJ'^I 1 -Apr 



BT ~-'---C~C>^^04-Apr 

 80 76^^27-Mar'^ 



Pamunl<ey 1998: American Shad Eggs 



May 

 May 



02-Apr 



Pamunkey 1999: American Shad Eggs 



120 



May 

 ''■^ 104 



Figure 2 



American shad egg density and distributions for 1997-99 bongo and pushnet collections. Stations 

 are denoted as their distance (in kilometers) from the mouth of the York River 



and Hoenig^). In contrast, striped bass stocks are at record 

 levels of abundance (Field, 1997) and support a large rec- 

 reational and commercial fishery in the York River. 



Despite the proximity and resemblance of the Pamun- 

 key and Mattaponi Rivers, patterns of spawning and 

 recruitment of American shad and striped bass are op- 

 posite for each tributary. We observed annual differences 



in abundance of eggs and larvae of these species that are 

 concordant with indices of juvenile production. In our 

 surveys, eggs and larvae of American shad were more 

 abundant on the Mattaponi River and striped bass eggs 

 and larvae were more abundant on the Pamunkey River 

 (Tables 1 and 2). Similarly, mean recruitment (the mean 

 index of juvenile abundance or JAI) of American shad 



