Alaska Fisheries Science Center (AFSC) surveys and fishery observer catch records provide biological information on shark species that occur in the Gulf of Alaska (GOA) (Table 20.1 and Figure 20.1). The three shark species most likely to be encountered in GOA fisheries and surveys are the Pacific sleeper shark (Somniosus pacificus), the spiny dogfish (Squalus suckleyi), and the salmon shark (Lamna ditropis).