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Dogfish Shark

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by

Jimmy Zitnik

on 17 October 2014

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Transcript of Dogfish Shark

Squalus acanthias
"Spiny Dogfish"
-Nick-named the dogfish by fishermen who observed them chasing down smaller fish in packs.
-Average just over one meter in length, and a maximum weight of 9.8 kilograms.

Spiny Dogfish
Temperate and Subarctic waters
-Dogfish sharks are found all over the world, due to the wide range of waters that they tolerate.
-The fish can live in temperatures of 40-60 degrees Fahrenheit.
-The spiny dogfish can reach depths of up to 900 meters.

Adaptations
As pictured here, the main digestive organs of the shark are the liver, gall bladder, pancreas, stomach, esophagus and spleen.
This image exposes the Cerebrum, Cerebellum, diencephalon, olfactory lobes and sacs, and the optic lobe.
The gills of the dogfish are the respiratory organs of the shark. Arteries from the heart pump deoxygenated blood into the gill lamellae, and here it is diffused from the water and then into the blood.
Ecosystem
Reproduction and Development
Reproduces sexually in the winter resulting in a litter of 2-15 babies.
3 Ecological Problems
Three ecological problems that could effect the Dogfish Shark are coastal development, wetland loss and degradation, and sewage disposal are a factors that are a threat to the Dogfish.
Preserving the Ecosystem
The shark is important to our economy; making medicines, providing cartilage for therapies, providing fins for soup and more.
Ecological Relationship
The Dogfish Shark helps its ecosystem because it can be consumed by humans either fresh or salted. The liver of the shark can be used medically.
The shark does not harm it's environment, but its large population can interfere with commercial fishing.
Interesting Facts
-Dogfish meat is disguised as “rock salmon” in Britain.
-The spiny dogfish is the most abundant shark in the world.
-Has the longest gestation period of all vertebrates.
-Most commonly dissected shark.

The diet of the dogfish ranges from teleost fishes like hake and salmon, to Ragworms.
The Spiny Dogfish is cold blooded- meaning that it cannot regulate its own body temperature.
The liver of the shark is divided into three lobes- the right, median, and left lobe
Dissection
-The spikes on the fins are a defensive mechanism.
-Dorsal fin is mildly poisonous.
-Teeth are layered in rows so that the shark always has backups.
After the female has mated, the embryo develops inside of an egg while remaining in the mother, otherwise known as ovoviviparous development.
After 4-6 months the membrane providing nourishment to the embryo breaks down
After anywhere from 21-25 months, the baby dogfish is born.
-Shark: (Habitat)Temperate waters-subarctic. (Niche)Most activity occurs at dusk- carnivores- reproduce sexually.
-Turtle: (Habitat) Live in temperate waters, but can survive on land. (Niche) They reproduce sexually, and the female lays eggs on land-
-Seaweed:(Habitat)Estuary.(Niche)Producer
-Phytoplankton: (Habitat)Near coasts of the ocean.(Niche)Producer and photosynthesize.
Development
Full transcript