Data Summaries and Limitations 



Spring and fall distribution plots and percentage young-of-the-year plots 

 display data for the entire geographical area. The graphs displaying catch 

 data (weight and number per tow) and the histograms displaying length 

 frequency data are also on a spring and fall basis, but the geographical area 

 considered in this report was divided into six sub-areas, based on depth and 

 latitude. This method was used to highlight any depth or north-south 

 distributional differences that may occur with each of the studied species. 

 Three offshore areas, and three corresponding inshore areas (separated by the 

 28 m contour) were established: Strata Set 1 (New York Bight Inshore) 

 consists of inshore strata 1-23, 45 and 46; Strata Set 2 (Delaware-Chesapeake 

 Inshore) consists of inshore strata 24-38; Strata Set 3 (North Carolina 

 Inshore) consists of inshore strata 39-44 (Figure 1); Strata Set 4 (New York 

 Bight Offshore) consists of offshore strata 1-8 and 73-76; Strata Set b 

 (Delaware-Chesapeake Offshore) consists of offshore strata 65-72; Strata Set 6 

 (North Carolina Offshore) consists of offshore strata 61-64 (Figure 2). 



All compilations and calculations for this report were done with the aid 

 of a Xerox Sigma-7 computer using a Honeywell CP-V operating system. The 

 software used were Northeast Fisheries Center in-house programs. The 

 coastline plots were generated using the following programs: MAPRET, PREMAP, 

 LINKSURV5, and FISHMAP. The SUR 1 package, with its subroutines, was used to 

 analyze catch data. Subroutine LSTS produced station listings, subroutine 

 LSTB was used to process the catch data (number and weight per tow), and 

 subroutine LSTL was used to process length frequency data. Results of the 

 analyses were plotted on histograms and XY graphs using the program GRAPH. 

 Program documentation is on file with the Automated Data Processing Unit of 

 the Northeast Fisheries Center. 



