Author Edgar Ravenswood Waite (1866–1928)
English: Squalus fernandinus
Subject: Sharks, Spiny dogfish
Tag: Fish
Date 1921
Source/Photographer
English: Waite, Edgar R. (1921) Illustrated Catalogue of the Fishes of South Australia, Adelaide, Australia: G. Hassell & Son
Source: https://commons.wikimedia.org/wiki/File:FMIB_45543_Squalus_fernandinus.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.