wrap up on sharks. classification of sharks spiny dogfish

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Wrap Up on Sharks

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Page 1: Wrap Up on Sharks. Classification of Sharks Spiny Dogfish

Wrap Up on Sharks

Page 2: Wrap Up on Sharks. Classification of Sharks Spiny Dogfish

Classification of Sharks

Page 3: Wrap Up on Sharks. Classification of Sharks Spiny Dogfish

Spiny Dogfish

Page 4: Wrap Up on Sharks. Classification of Sharks Spiny Dogfish

Spiny Dogfish Shark, Squalus acanthiasOther Names: cape dogfish, spring dogfish, spiked dogfish, spur dog

Life History• Average lifespan: 35-40 years• Maturity: Males, 6 years Females, 11 years• They have the longest gestation period of any vertebrate,

which is about 18-24 months• Females have between 2-12 eggs and an average of six pups,

per spawning season• Females are larger in body size than males sexual

dimorphism

Page 5: Wrap Up on Sharks. Classification of Sharks Spiny Dogfish

Dogfish cont’d.Feeding• Opportunistic feeders: crustaceans, jellyfish, squid, schooling

fish (such as mackerel and herring)• Preyed upon by cod, red hake, goosefish, other dogfish, larger

sharks, seals, and orcas

Habitat/Range• Distributed throughout the North Atlantic and North Pacific,

occurring from Cape Hatteras (Maine) and can be found as far south as Florida

• Migrate north in the spring and summer, and south in fall and winter

• Travel in schools

Page 6: Wrap Up on Sharks. Classification of Sharks Spiny Dogfish

More Dogfish Facts:

• Most common and frequently studied shark in the world

• Can migrate more than 5,000 miles Equivalent to flying from NY to CA round trip!

Page 7: Wrap Up on Sharks. Classification of Sharks Spiny Dogfish

Other Species of Sharks We Should Know About

Great White Shark, Carcharodon carcharias

Page 8: Wrap Up on Sharks. Classification of Sharks Spiny Dogfish

Life History:• Average lifespan is unknown predicted to be up to 100 yrs.

however, this is not yet proven• 5,000+ lbs. and 15-20 ft. long 7,000 lbs. and 23 ft. long

(largest on record)• Pups can be over 5 ft. long at birth aplacental viviparity• Population status is vulnerable• No reliable data on these sharks

Great White Shark cont’d.

Page 9: Wrap Up on Sharks. Classification of Sharks Spiny Dogfish

Feeding:• Largest predatory fish on Earth up to 3,000 teeth at once• Feed on seals, sea lions, small toothed whales, and sometimes

sea turtles apex predators on the food web• Don’t chew their food meals can sustain them for 2 months

long

Habitat/Range:• Cosmopolitan range distribution temperate coastlines

around the world, but are also pelagic• Can swim up to 15 miles per hr very migratory• Solitary but occasionally travel in pairs• Protected on coasts of US, Australia, and South Africa

Page 10: Wrap Up on Sharks. Classification of Sharks Spiny Dogfish

Other Shark Species, cont’d.

Hammerhead Shark, Sphyrna mokarran

Page 11: Wrap Up on Sharks. Classification of Sharks Spiny Dogfish

Hammerhead Shark cont’d.

Life History• Average life span: 20-30 years• 500-1,000 lbs. and 13-20 ft. long • Viviparity one litter can range from about 6-50 pups• Mother immediately separates from young good percentage

survive

Page 12: Wrap Up on Sharks. Classification of Sharks Spiny Dogfish

Feeding:• Mostly stingrays, but also bony fishes, crabs, lobsters, and

squid• Solitary hunters may be seen in groups in the daytime, but

not at night• Uses its head shape to pin down stingrays• Predators: great whites, tiger sharks, orcas

Habitat/Range:• Cosmopolitan Distribution• Warm, temperate waters coastal and along continental shelf• Population status: Vulnerable

Page 13: Wrap Up on Sharks. Classification of Sharks Spiny Dogfish

Other Shark Species, cont’d.Whale Shark, Rhincodon typus

Page 14: Wrap Up on Sharks. Classification of Sharks Spiny Dogfish

Whale Shark cont’d.

Life History:• Estimated lifespan: 100-150 years• Largest fish in the ocean 20.6 tons and 18-33 ft long (40 ft. is

the largest on record)• Females larger than males• Viviparity up to hundreds of pups, each about 2 ft. long• Sexual maturity is 30 years old

Page 15: Wrap Up on Sharks. Classification of Sharks Spiny Dogfish

Feeding:• Have 3,000 teeth but are filter feeders plankton, krill small

fish, squid• They have gill rakers similar to baleen that some whales

have• Can process over 1,500 gallons of water per hour

Habitat/Range:• Found worldwide along the warm waters of the equator• Coastal and pelagic spend most time near the surface• Average speed is 3 miles per hr• Solitary

Page 16: Wrap Up on Sharks. Classification of Sharks Spiny Dogfish

What’s With the Remora?

Page 17: Wrap Up on Sharks. Classification of Sharks Spiny Dogfish

• The remora is a symbiotic “sucker fish” that attaches itself to sharks with a disc that was modified from the dorsal fin.

• They are harmless to sharks, and may attach to whales and marine mammals.

• They eat parasites off the shark and any leftover food from the shark

• Keeps the sharks clean, while they can travel, coexist, and feed all at the same time!