Jung and Houde: Recruitment and spawning-stock biomass distribution of Anchoa mitchilli 65 



tions per survey ranged from 24 to 52 (six-year total=597). 

 Additional baywide surveys (August 1997 and September 



1998) and partial surveys (June 1997, July 1998, and July 



1999) also provided data (total stations =146). 



An 18-m 2 mouth-opening midwater trawl (MWT), with 

 3-mm codend mesh was deployed from the stern of the 

 37-m research vessel Cape Henlopen. All trawling was 

 conducted at night. Standardized tows of 20-min dura- 

 tion were conducted and the trawl was deployed at graded 

 depth intervals from surface to bottom ( 2 minutes at each 

 depth interval ) in order to provide a sample of fish from 



the entire water column. Fish catches (or subsamples) were 

 counted, measured (to the nearest 1.0 mm), and weighed 

 on deck immediately after a tow. 



Abundance and biomass of bay anchovy recruits and 

 spawners 



We separated bay anchovy catches into YOY and spawn- 

 ers based on total length (TL). The minimum length of bay 

 anchovy retained by the MWT was 21 mm TL, which we 

 also defined as the minimum TL for recruited YOY bay 



