Fertilization in the dogfish shark is internal, usually taking place within the shell gland of the oviduct. The fertilized eggs continue to move posteriorly to the uterus. As they grow the pups are attached to the egg, now known as the yolk sac, by means of a stalk.
What structure is unique to dogfish?
A feature peculiar to our specimen, the spiny dogfish, is the presence of two spines, one immediately anterior to each dorsal fin. When captured, these sharks will arch their backs and attempt to pierce their captor with these long sharp spines.
What is the structure of a shark?
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.
What structure is posterior to the stomach dogfish shark?
The posterior pleuroperitoneal, visceral or abdominal cavity, houses the liver, digestive tract, and gonads.
What external structures can be used to determine the gender of a dogfish?
Examine the pelvic fins to determine its sex. A male has a long, rigid structure called a clasper on the inside edge of each pelvic fin. The clasper is inserted into the female’s cloaca to transfer sperm during reproduction. Locate the cloaca between the pelvic fins.
Can you eat dogfish?
You can eat dogfish without a problem. Dogfish are edible and are regarded by some as one of the tastiest sea foods out there. If someone was to ask me what dogfish tastes like, I would tell them that smooth dogfish in particular have a flaky, firm texture, with a mild sweet flavor.
Are dogfish poisonous?
Meet the Pacific spiny dogfish
As their name suggests, spiny dogfish sharks sport sharp, venomous (poisonous) spines in front of each dorsal fin. Their bodies are dark gray above and white below, often with white spotting on the sides.
Do sharks have balls?
Testes. Most male fish have two testes of similar size. In the case of sharks, the testes on the right side is usually larger. The primitive jawless fish have only a single testis, located in the midline of the body, although even this forms from the fusion of paired structures in the embryo.
Do sharks poop?
So, do sharks poop? They sure do! Every living animal that consumes food has to have a way of getting rid of waste.
Do sharks have 2 Hearts?
Sharks possess a single-circuit circulatory system centered around a two-chambered heart. Blood flows from the heart to the gills where it is oxygenated.
What structure is the connection between the pharynx and the stomach?
Esophagus: The esophagus is a muscular tube that connects the pharynx (throat) to the stomach. The esophagus contracts as it moves food into the stomach. A “valve” called the lower esophageal sphincter (LES) is located just before the opening to the stomach.
What is the skeleton of a dogfish made of?
Like all sharks lesser-spotted dogfish don’t have bones. Instead they have skeletons made of cartilage which is often calcified to make it stronger.
Where is the pancreas located on a dogfish shark?
Digestive Organs
Pancreas, consisting of two lobes; a ventral lobe overlying the duodenum, and a dorsal lobe, in the curve between pyloric stomach and duodenum. The pancreatic duct is usually difficult to locate, it runs from the junction of the lobes into the duodenum.
Do sharks have tongues?
Do sharks have tongues? Sharks have a tongue referred to as a basihyal. The basihyal is a small, thick piece of cartilage located on the floor of the mouth of sharks and other fishes. It appears to be useless for most sharks with the exception of the cookiecutter shark.
What sensory organs do sharks have?
Sharks have a complex electro-sensory system. Enabled by receptors covering the head and snout area. These receptors sit in jelly-filled sensory organs called the ampullae of Lorenzini. These tiny pores are extremely sensitive and can detect even the faintest of electrical fields.
What does a dogfish shark use its pectoral fins for?
Pectoral fins originate behind the head and extend outwards. These fins are used for steering during swimming and help to provide the shark with lift.
Do dogfish pee through their skin?
Without a bladder, dogfish basically urinate through their skin by osmosis. Once dogfish die, bacteria can quickly convert the urea in their blood and tissue into ammonia.
Do dogfish bite humans?
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. They are considered one of the most abundant living shark species in the ocean, but are harmless to humans.
Do dogs fish bark?
The bowfin, commonly called dogfish in the Midwest, is truly a one of a kind fish. It is scientifically known as Amia calva, which is derived from the Greek, Amia meaning fish and calva meaning smooth.
Do dog fish 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 sharks be blue?
Blue sharks are recognizable for their exceptionally slender body and bright blue coloration. They are dark blue on the back, bright blue on the sides, and white on the underside.
Marilyn Medina is a food expert with over 15 years of experience in the culinary industry. She has worked in some of the most prestigious kitchens in the world, including The Ritz-Carlton and The French Laundry.
What makes Marilyn stand out from other chefs is her unique approach to cooking. She believes that food should be accessible to everyone, regardless of their budget or dietary restrictions. Her recipes are simple, delicious, and healthy – perfect for anyone who wants to cook like a pro!