In 2010, Greenpeace International added the spiny dogfish to its seafood red list.

In the recent past the European market for spiny dogfish has increased dramatically, which led to the overfishing and decline of the species.

Other large species in the tank are spiny dogfish, skates, and three ocean sunfish.

"Trash fish" with little commercial value, like spiny dogfish, skate and mackerel, have replaced them.

The spiny dogfish has dorsal spines, no anal fin, and white spot along its back.

Two sharks most at risk - spiny dogfish and porbeagle - are the most sought after in Europe for their meat.

Spiny dogfish sharks eat fish, squid, and octopus.

Along with the spiny dogfish (Squalus acanthias), the little skate is often used as a model organism in biomedical research.

Spiny dogfish are bottom-dwellers.

This drastic increase led to the creation and implementation of many fishery management policies placing restrictions on the fishing of spiny dogfish.

They have also been observed in captivity catching spiny dogfish (Squalus acanthias) of up to four feet in length.

Northern hemisphere populations of the Spiny dogfish (Squalus acanthias)

In aquariums, they have been seen eating Spiny dogfish (Squalus acanthias), a type of shark 3-4 feet long.

Spiny dogfish, also called sand shark (the fish of fish and chips in England), is cheap, delicious and abundant, he said.

Squalus acanthias (Spiny dogfish)

Squalus griffini (Northern spiny dogfish)

Squalus raoulensis (Kermadec spiny dogfish)

Squalus suckleyi (Spotted spiny dogfish)

The populations which are in decline are: middle-trophic level predators such as rockfish, spiny dogfish, Pacific cod, and hake.

Similarly, current knowledge of the stock biomass of spiny dogfish and skates is based only on surveys, since catch-at-age based studies have not been undertaken.

Various shark species are being over-fished, in particular the porbeagle and the spiny dogfish, but other shark species are also affected by this.

In that vein, the European Union has tabled proposals to regulate trade in two shark species: porbeagle and spiny dogfish.

The Spiny dogfish (Squalus acanthias), a very common species, reaches the largest sizes of the "true dogfish" family.

For example, both the spiny dogfish and the Port Jackson shark have spines in their dorsal fins which are capable of secreting poison.

Squalidae (dogfish sharks), particularly the spiny dogfish (Squalus acanthias)

Virtually nothing is known about the natural history of the bighead spurdog.

The roughskin spurdog is ovoviviparous with 21 to 22 young in a litter.

The blacktailed spurdog has been seldom studied for parasites.

Allin was still intent on the Spurdog.

I could still smell the rank sweat of my own fear and the charring of the burning Spurdog.

Wizardry or just chance swept a sheaf of blazing arrows back into the Spurdog's sails.

The eastern highfin spurdog, Squalus albifrons, is a dogfish which was described in 2007.

The bighead spurdog is a robustly built, spindle-shaped shark with a hump behind the head.

Parrail risked a glance over the stern rail and saw a second hungry pack come fanning out on either side of the Spurdog.

Longboats surged out from behind the Spurdog, each packed with pirates, blades cutting bright swathes in the sunlight.

The fatspine spurdog is a rare, small and slender dogfish with a broad head and short snout.

Allin took a resolute breath and magefire leapt from the Spurdog to the Thornray.

The western highfin spurdog, Squalus altipinnis, is a dogfish of the family Squalidae.

As the Spurdog ran a vivid scarlet pennant up its mainmast, the Thornray answered with its own.

The shark at the beakhead below the bowsprit identified it as the Spurdog and it looked unholy imposing in these confined waters.

Squalus japonicus (Japanese spurdog)

The helmsman glanced over his shoulder as the Spurdog's sails stole what little breeze the Tang could hope for between the confining islands.

The Spurdog was burning with a furnace roar and, with the Thornray helpless, the pirate vessels drifted apart.

Cirrhigaleus asper (Roughskin spurdog)

Squalus albifrons (Eastern highfin spurdog)

Squalus altipinnis (Western highfin spurdog)

Squalus blainville (Longnose spurdog)

Squalus bucephalus (Bighead spurdog)

Squalus chloroculus (Greeneye spurdog)

Squalus crassispinus (Fatspine spurdog)

Mud sharks, that's what pigs seemed like to her.

According to Zappa this is supposed to replace "The Mud Shark" (a song from the live album Fillmore East - June 1971) in Zappa mythology.

On the Frank Zappa / Mothers of Invention album Fillmore East - June 1971, the above described events form the storyline of the song "Mud Shark."

In the tale, a mud shark is caught by one of the members of Vanilla Fudge or its crew and, when combined with a groupie and a movie camera, depravity ensues.

In some primitive cartilaginous fishes, such as the spiny dogfish or mud shark (Squalus acanthias), there is a terminal nerve numbered zero, since it exits the brain before the traditionally designated first cranial nerve.

The spiny dogfish, spurdog, mud shark, or piked dogfish, Squalus acanthias, is one of the best known of the dogfish which are members of the family Squalidae in the order Squaliformes.

The most famous part of the album is "The Mud Shark", a telling of a story told to Mother Don Preston by some members of Vanilla Fudge about a hotel, Seattle's Edgewater Inn, where guests could fish from their rooms.

Although not stated in "The Mud Shark," this 1969 incident, now referred to as "the Shark episode," also involved Led Zeppelin's drummer John Bonham and road manager Richard Cole, with Vanilla Fudge's singer/keyboardist Mark Stein operating the movie camera.

The spiny dogfish, spurdog, mud shark, or piked dogfish, Squalus acanthias, is one of the best known of the dogfish which are members of the family Squalidae in the order Squaliformes.

Northern hemisphere populations of the Spiny dogfish (Squalus acanthias)

Squalidae (dogfish sharks), particularly the spiny dogfish (Squalus acanthias)

Cephalopods, particularly squid, also form an important component of its diet, while smaller sharks such as spiny dogfish (Squalus acanthias) and tope sharks (Galeorhinus galeus) are rarely taken.

To crack their shells, the horn shark generates the highest known bite force relative to its size of any shark, well in excess of other measured species such as the spiny dogfish (Squalus acanthias) and the blacktip shark (Carcharhinus limbatus).