Nederlands: twee doornhaaien (Squalus acanthias)
English: 2 spiny dogfish (Squalus acanthias)
Date 11 December 2016
Source http://www.ecomare.nl/
Author Ecomare/Salko de Wolf
Source: https://commons.wikimedia.org/wiki/File:Ecomare_-_doornhaai_(doornhaai-814-sw).jpg

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.