Zebra Mussel Quiz

Where is the zebra mussel originally from?

• Hudson River

• Caspian Sea

• Great Lakes

• North America

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When did zebra mussels first become established in the Great Lakes?

• In the mid-1980s

• In 1991

• By the end of 1992

• Before the 1980s

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Why do ships carry ballast water?

• To balance the ship when there is no cargo

• To increase the speed of the ship

• To clean the ship's storage areas

• To transport invasive species

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What can happen when ballast water is taken into the ship?

• It can increase the ship's speed

• It can cause the ship to sink

• It may contain organisms that can become invasive species

• It cleans the ship's cargo hold

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How do zebra mussels spread to new areas?

• Through air currents

• By attaching to the hulls of ships

• By being transported in ballast water

• By swimming against water currents

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What are veligers?

• Adult zebra mussels

• Fertilized zebra mussel eggs

• Free-swimming larvae of zebra mussels

• The eggs of zebra mussels

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What is the frequency at which zebra mussels filter water in the freshwater part of the Hudson River?

• Every 2-3 days

• Every 2-3 weeks

• Every 2-3 months

• Every 2-4 days

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By what percentage have phytoplankton levels decreased in the Hudson River due to zebra mussels?

• 70%

• 80%

• 60%

• 50%

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What negative effect have zebra mussels had on native mussel populations?

• Native mussel populations have increased

• Native mussel populations have remained stable

• Native mussel populations have decreased

• Native mussel populations have migrated

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Which of the following species have suffered due to decreased phytoplankton levels caused by zebra mussels?

• Shad and herring

• Trout and salmon

• Carp and catfish

• Bass and pike

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