Sagarese et al.: Spatiotemporal overlap of Squalus acanthias and commercial fisheries within the northeast U.S. marine system 
109 
Figure 2 
Annual centers of spiny dogfish (Squalus acanthias) abundance in the northeast U.S. shelf large 
marine ecosystem between 1989 and 2009 during (A) autumn and (B) spring as observed in the 
sink gillnet fishery (red line), otter trawl fishery (green line), and Northeast Fisheries Science 
Center (NEFSC) bottom trawl survey (black line). Shaded gray area indicates land mass. Gray 
lines represent depth contours (200-, 100-, 80-, 60-, 40-, and 20-m isobaths). Note that values for 
the sink gillnet fishery start in 1995 because of the commencement of the NEFSC Northeast Fish- 
ery Observer Program in the mid-Atlantic. Numbers on each colored line refer to years, where 
89=1989, 90=1990, 00=2000, and so on. 
