218 



Fishery Bulletin 104(2) 



runs where surveys were weighted equally within the 

 models. Table 2 lists the three fishery-independent mod- 

 els (referred to as FI) and the four fishery-dependent 



models (referred to as FD) used in production model 

 applications and the CV and weighting of each survey 

 within the models. 



a. 

 o 



30 



25 



20- 



1 5- 



1 



05 



0.0 



-0.5- 



-1 



-1 5 



Hand harvest CPUE 

 Dredge harvest CPUE 



1991 1993 1995 1997 1999 2001 



Year 



Figure 2 



Fishery-dependent abundance indices based on catch-per-unit- 

 of-effort data for the Delaware hand and dredge horseshoe crab 

 tLimiiliiti polyphemus) fisheries. 1991-2002. standardized by index 

 for comparison. 



Harvest 



We obtained horseshoe crab harvest data for 

 Virginia, Maryland, Delaware, Pennsylvania, 

 and New Jersey from 1995 to 2003 (NMFS'; 

 Michels*). We combined harvests among states 

 for regional-scale production model runs. We 

 estimated the regional harvest from 1991 to 

 1994 from available Delaware landings data 

 (Fig. 3). Reporting of harvest was not manda- 

 tory during this time period, and harvest data 



NMFS (National Marine Fisheries Service). 

 2004. Fisheries Statistics and Economics Divi- 

 sion, Silver Spring, MD. Landings data (by state 

 and year) obtained in August 2004 from http:// 

 www.st.nmfs.gov/stl/commercial/index.html. Web 

 page was last modified 24 September 2003. 

 ' Michels, S. Personal commun. 2004. DE Div. 

 of Fish and Wildlife, 89 Kings Highway, Dover, 

 DE 19901. 



