Broadnose Sevengill Shark

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Ecologists are naturally concerned when record-setting rain this year altered the Broadnose Sevengill shark nursery grounds in San Francisco Bay.

About Broadnose Sevengill Shark

  • It is a large seven-gilled with a wide head and short, blunt snout shark.
  • It is related to sharks that lived in the Jurassic Period about 300 million years ago.
  • They prefer tropical temperate, shallow waters
  • Distribution:
    • Found in all oceans except the North Atlantic and the Mediterranean Sea.
    • In the eastern Pacific Ocean, they are found from southeastern Alaska to southern Baja California, Mexico and from Colombia to Chile.
  • Biology and Behaviour
    • They can grow to a maximum length of 2.9 m. Females grow longer than its male counterparts.
    • They feed on anything such as other sharks, rays, chimaeras, bony fish, hagfish, dolphins and porpoise meat, seals, shark egg cases and sea snails.
  • Conservation status
    • IUCN: Vulnerable


Q1) What is a tropical region?

A tropical region, often referred to simply as the tropics, is a geographical area of the Earth located between the Tropic of Cancer and the Tropic of Capricorn. These two imaginary lines are located approximately 23.5 degrees north and 23.5 degrees south of the equator, respectively.

Source: In San Francisco Bay, ecologists work to protect sevengill sharks