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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.piny dogfish are fished for food in Europe, the United States, Canada, New Zealand and Chile. The meat is primarily consumed in England, France, the Benelux countries and Germany.
Description: Pupfish are ray-finned fish with have striking coloration. The Devils Hole pupfish (Cyprinodon diabolis), for example, is bright blue with purplish accents.The White Sands pupfish has yellow and orange fins. Size: Most pupfish are very small, some less than an inch in length.Diet: Pupfish feed on algae, plants, aquatic invertebrates, and insects.ife History and Reproduction: The Devils Hole pupfish lives in a relatively constant habitat, so it can breed year round. The mating system is polygynous, and males may prevent other males from breeding with a female. When larvae hatch, they are less than a centimeter long.