There is no anal fin on the spiny dogfish. The dorsal surface of the spiny dogfish is slate-colored and may have a brownish cast. There is a lateral row of small white spots along each side from above the pectoral fins to above the pelvic fins.
What is absent in shark?
So, the correct answer is ‘Air bladder‘.
Which fin does the dogfish shark not have?
anal fin
They do not have an anal fin but they do have a special fin. Because of its name, this spiny dogfish has two spines that are in front of each dorsal fin. The two spines are known for their venomous nature used as protection against enemies such as other sharks, humans and even whales.
What are the characteristics of a dogfish shark?
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. Males grow up to 3.3 feet, and females grow up to 4 feet.
Which among the following is absent in cartilaginous fishes?
The operculum is a bony flap covering the gills in bony fishes. It regulates the direction of water flow over the gills. It is not found in cartilage fishes.
Which of the following characters are absent in a fish but present in angel fish?
>>Air bladder is absent in fishes.
Is Air bladder present in shark?
The gas/tissue interface at the swim bladder produces a strong reflection of sound, which is used in sonar equipment to find fish. Cartilaginous fish, such as sharks and rays, do not have swim bladders.
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.
Does a 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.
Do dogfish have spines?
Two large, sharp, mildly poisonous dorsal spines are located in front of each dorsal fin. The spiny dogfish uses its spines defensively by curling up its body and striking at an enemy. Spiny dogfish skin is rough and covered by a tooth-like, scaled surface called dermal denticles.
Does dogfish have swim bladder?
Chondrichthyeans lack the swim bladder or lung that evolved early among the bony fishes, and modern sharks all possess a large, oil-filled liver that dramatically reduces their specific density.
Do dogfish have eyelids?
Upper and lower eyelids protect the eye. Just inside the lower lid is a membrane that extends over the surface of the eye to cover the cornea. Large spiracle openings are located posterior and dorsal to the eyes. A spiracular valve, permits the opening and closing of the external spiracular pore.
What have you learned about the dogfish shark in terms of physical characteristics?
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.
Which is uncommon between cartilaginous and bony fishes?
However, the most obvious disparity between the two types of fish is the composition of their skeleton. As the name suggests, “bony fish” have a skeleton composed of only bones while a cartilaginous fish has a skeleton made entirely of cartilage. Read on to discover more differences between the two.
Which feature is found in bony fishes but not in cartilaginous fishes?
Notochord. 10. One particular feature found in bony fishes but is absent in cartilaginous fishes: A. Scales.
What are the differences between cartilaginous fishes and bony fishes?
The main difference between bony fish and cartilaginous fish is that bony fish have an endoskeleton completely made up of bones whereas cartilaginous fish have an endoskeleton primarily made up of cartilages.
In which fish Air bladder is absent?
The swim bladder is missing in some bottom-dwelling and deep-sea bony fish (teleosts) and in all cartilaginous fish (sharks, skates, and rays).
Which of the following is not a characteristic features of cartilaginous fish?
Cartilaginous fishes do not contain gill cover/operculum. So, the correct answer is ‘Gill cover/operculum’.
What are 4 characteristics that all cartilaginous fish have in common?
The cartilaginous fish are jawed fish with paired fins, paired nostrils, scales, two-chambered hearts, and skeletons made of cartilage rather than bone.
What do sharks have instead of a swim bladder?
All sharks are slightly negatively buoyant, which means they sink. Unlike many bony fishes, sharks do not have a swim bladder to provide buoyancy. To help compensate for their tendency to sink, their livers contain large amounts of oil that is less dense than seawater.
Which fish is present in air bladder?
bony fish
It is a sac-like outgrowth from the dorsal wall of the oesophagus. It is hydrostatic in function and in some cases respiration as well. It provides bouncy to the fishes and helps them in swimming. Flying fish is bony fish, therefore present in them.
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