The spiny dogfish shark is a small shark that is deep gray with some white spots; the belly is off-white. It had two dorsal fins, each preceded by a mildly poisonous spin. It has a short snout, large eyes and no anal fin. The smooth teeth are located in rows which rotate into use as needed.
What are the characteristics of dogfish?
The spiny dogfish has a slender, elongate body and a moderately flattened head. The snout is narrow, tapering to a pointed tip. The eyes of this dogfish are moderately large. The first dorsal fin is located about halfway between the pectoral and pelvic fin origins and behind the rear tips of the pectoral fins.
What is unique about the dogfish shark?
The spiny dogfish may go by many names, including piked dogfish, rock salmon and spiky dog, but only one truly represents this shark’s unique defense strategy. Using sharp, venomous spines in the front of each dorsal fin, the spiny dogfish is a small but mighty predator that isn’t afraid to take a jab at passing fish.
What other common names are used to describe the dogfish shark?
The spiny dogfish, spurdog, mud shark (Squalus acanthias) or piked dogfish, is one of the best known species of the Squalidae (dogfish) family of sharks, which is part of the Squaliformes order.
What are dogfish sharks?
dogfish, (order Squaliformes), any of several small sharks making up an order of chondrichthyian fishes composed of the families Centrophoridae (gulper sharks), Dalatiidae, Echinorhinidae, Etmopteridae, Oxynotidae, Somniosidae, and Squalidae. In North America the name is also used for a freshwater fish, the bowfin.
Is a characteristic feature of fishes?
All fishes are cold-blooded or ectothermic organisms. Due to this feature, the fishes are unable to regulate the temperature of their body. They depend on the outside environment for the purpose of the regulation of their body temperature.
How is the dogfish shark classified by body type?
How is the dogfish classified by body type? Is the shark a protostome or deuterostome? Deuterostome because it has a true body cavity.
Do dogfish have teeth?
The small teeth of the smooth dogfish are flat and blunt, similar in both the upper and lower jaws. They are asymmetrical with a rounded apex or cusp. Large mature smooth dogfish has tooth crowns that are low, hiding the cusps.
Can dogfish hurt you?
These “dogs” may not bite, but they sure can sting. On the leading edge of their dorsal spine is a big, white, needle-sharp spine, a formidable weapon capable of inflicting agonizing pain.
What is a dogfish look like?
Appearance. Spiny dogfish are slim, with a narrow, pointed snout and characteristic white spots. They are gray above and white below. They have two dorsal fins with ungrooved large spines.
Do dogfish have good eyesight?
The fact that its refractive index is high (1.66) suggests that the static optical system of this eye is very similar to that of the teleosts.
How long can a dogfish live out of water?
2-3 days
They can survive out of water for 2-3 days. Their diet consists of anything that looks edible, but is mainly other fish. They prefer water bodies with heavy vegetation, but do inhabit clear water lakes.
Do dogfish have lungs?
The lungs are long, slender and saclike. They run along the dorsal sides of the pleuroperitoneal cavity and are attached to the body wall by the pulmonary ligament on the left side and on the right, the hepatocavopulmonary ligament that also supports the liver.
Why is it called a dogfish?
The name “dogfish” stems from their habit of feeding in packs — sometimes numbering in the hundreds or thousands. Gathered together, they sweep an area, eating the fishes in front of them. They’ll eat almost anything they can get their strong jaws and teeth on.
How long do dogfish sharks live?
Biology. Spiny dogfish live a long time, sometimes more than 80 years. They grow slowly, up to more than 4 feet and 22 pounds, although adults are generally 2½ to 3½ feet long.
What are the 7 main characteristics of fish?
CHARACTERS
- Fishes are aquatic; cold blooded vertebrates.
- Their body is divisible into head, trunk and tail.
- It has a spindle shaped body.
- The body is covered by scales.
- Respiration is by gills.
- On the head a pair of nostrils are present internal nostril are absent.
- On the head a pair of eyes is present.
Which is the common body characteristics in fish and bird?
Expert-verified answer
Both have streamlined body. Both lays calcareous eggs. Both have scales. Both belongs to group animilia.
How many characteristics do fish have?
Suggest that students memorize the initials “WGFB” to assist them in remembering the four main traits of fish: “Water, Gills, Fins, Backbone.”
What traits allowed the shark to adapt to its underwater environment?
A shark has fins and a streamlined body that help it swim through water. It has gills, which take in oxygen directly out of the water. Because of its gills, sharks can stay underwater and not have to come to the surface to breathe. Sharks also have a tremendous number of sharp teeth, which make them fierce predators.
What features of a shark’s anatomy of body will allow it to be able to survive in the ocean?
Shark skeletons are made of cartilage. This is strong and durable, yet much more flexible and lighter than bone. Being lighter helps a shark to stay afloat and reduces the amount of energy they need to move about. The flexibility of cartilage also allows them to make tight turns quickly.
Is dogfish a bony fish?
Cartilaginous fishes are jawed fish with paired fins, paired nares, scales, a heart with its chambers in series, and skeletons made of cartilage rather than bone. Shark fish are called dogfish because they travel and hunt in packs. Shark is a cartilaginous fish. Thus, the correct answer is option A.
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