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Dogfish Shark (Alternative Dissection)

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Anna Ingram

on 8 May 2015

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Transcript of Dogfish Shark (Alternative Dissection)

Opportunistic feeder
Whatever they can easily eat
Prey such as capelin, cod, haddock, hake, herring, menhaden, ratfish, krill, crabs, worms, jellyfish, squid, octopus
First 2 rows of teeth for prey
Smooth teeth are located in rows which rotate into use as needed
Other rows rotate in place as needed
If teeth are broken or lost, new ones rotate in and replace them
28 upper teeth and 22-24 lower teeth
Sharks use their gills to filter oxygen from the water, making them capable of breathing under water
Spiracles are gill slits behind the eyes, which give oxygen directly to the eyes and brain
All sharks have five to seven gill slits
Internal Transport
Dogfish sharks have 4 heart chambers
Single looped circulatory system
Closed circulatory system
Sharks retain high concentrations of urea and trimethylamine oxide in their body tissue because they are important in regulating a shark’s internal salt-to-water balance
Lateral Line for water pressure
Skin for touch and temperature
Mouth and nose for touch and temperature
Ampullae of Lorenzini for electro-perception
Upper-lobe caudal is well developed
Lower caudal lobe is not well-developed
Cartilage skeletons to stay lighter
Large livers full of low-density oils
Dogfish Shark
General Info
Part of the dogfish family of sharks
Chondrichthyes ( sharks, rays, and skates)
Cartilage skeletons
Variety of habitats, it can handle many ranges of temperature and salinities (salt content)
Males are 2-3 feet
Females are 3-5 feet
Digestive Organs
The mouth grinds food
The pharynx is the intersection of the digestive tracts (passage way for food)
The anterior intestine is part of the digestive tract just after the stomach
The stomach is the part of the digestive tract that helps break down food
Posterior intestine helps broken down food travel (like the anterior intestine)
The liver produces bile
Oviparous - Eggs are formed and hatched inside the mother before live young are born into the surrounding water.
Viviparous - live birth, developed inside of mother
Ovoviviparous - Young develops in eggs that remain in the mother's body
Pregnant for 22 months
Number of young born in a litter is dependent on the size of the female
Usually 2-16 individuals
Male sexual maturity - 11 years
Female sexual maturity - 18-21 years
Birthed ready to take care of themselves
Swim away quickly if the mother doesnt eat them
First and second dorsal fin - stabilize the animal against rolling and to assist in sudden turns
Pectoral fin - helps control direction or movement
Pelvic fin - helps with direction
Caudal fin - helps swim and movement through water
Smooth muscles
Youtube Video
all pictures from google images

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