Author Irving Angell Field
English: Horned Dogfish (Squalus acanthias)
Subject: Spiny dogfish
Tag: Fish
Date 1906
Source/Photographer
English: Field, Irving A. (1906) Unutilized Fishes and their Relation to the Fishing Industries, Report of the Commissioner of Fisheries for the Fiscal Year 1906 and Special Papers, Washington, DC: Government Printing Office
Source: https://commons.wikimedia.org/wiki/File:FMIB_37726_Horned_Dogfish_(Squalus_acanthias).jpeg

The spiny dogfish, spurdog, mud shark, or piked dogfish (Squalus acanthias) is one of the best known species of the Squalidae (dogfish) family of sharks, which is part of the Squaliformes order. It is found mostly in shallow waters and further offshore in most parts of the world, especially in temperate waters.