Biology Project

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Biology Project
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Introduction

• Chinese white dolphins/pink dolphins are a
  cetacean species living in Hong Kong and southern
  China waters. They are pale white, nearly pink in
  colours, and enjoy swimming in estuaries (river
  mouth) among the islands of Hong Kong. One of the
  dolphins primary homes today is found in the
  waters north of Lantau Island, and around the
  smaller islands of Lung Kwu Chau(???) and Sha
  Chau(??).

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External features of the dolphin
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External features of the dolphin

• Body Shape Chinese white dolphins have no
  hair on their bodies. This helps to reduce the
  resistance resulting from their quick movements
  in the water. Their streamlined body shape also
  helps the dolphins to move easily in waters.
  Chinese white dolphins have no external ears or
  necks.

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Internal features of the dolphin
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Threats on Dolphins

• Loss of habitat This is often caused by land
  reclamation, for example, the West Kowloon
  Reclamation, Central Reclamation, etc., and
  dredging(removing mud from the river/sea bed).
  Both can destroy the dolphins' habitat.
• Reduction in food supplies This can be the
  result of overfishing, destruction of fish
  nursery.

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Threats on Dolphins

• Marine Traffic Boat engines and other noises
  in the sea can affect dolphin's ability to
  communicate and hunt. Remember dolphins travel by
  means of echolocation. Therefore, it is not
  uncommon to find dolphins bump into boats and
  other traffic at sea.

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Threats on Dolphins

• Pollution Toxic materials e.g. DDT, PCB,
  mercury, and other chemical waste from factories,
  and bacteria and viruses in untreated sewage
  sometimes flow into the sea and kill a lot of
  marine life.
• Oil spill Sea animals can also be killed
  by oil spill in the sea. The oil can damage the
  lung tissues of the animals.

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Threats on Dolphins

• Fishing Although many fishermen would not
  intentionally catch or kill dolphins, many
  dolphins are accidentally trapped in fishing nets
  and are choked to death or drowned.

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1.Protect their habitats

• Giving them places free from marine traffic where
  they can rest, nurse the young, and find food
• For example, Lung Kwo Chau, and Sha Chau have
  been marked as marine parks for dolphins

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2. Provide adequate food supply

• Not allowing dredging in prawn and fish spawning
  ground
• Not fishing in areas where dolphins will look for
  food
• Protecting young fishes and prawn as they are the
  basic food of the dolphins

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3. Keep marine traffic out of areas where
dolphins are usually found

• Stop ships from coming into the marine parks
• Set and enforce speed limits in the "dolphin
  areas
• Make sure that ships and boats do not make a lot
  of noise

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4.Keep our ocean clean

• Treat the sewage properly before it flows into
  the sea
• Stop using DDT, PCB, detergents and make sure
  they do not flow into the sea.
• Do not dump contaminated sludge in the sea. Treat
  it on land first

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5. Revise fishing practices

• No trawling in coastal waters

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6.Public Education

• Reduce waste (rubbish) production
• Recycle waste products
• Throw plastic products away properly (as they may
  be carried to the sea by strong winds which will
  then be harmful to the dolphins)
• Inform the public that it is illegal to harm,
  possess or trade Chinese White Dolphins