STANDARDS

CCSS: 3.MD.B.3, 3.MD.C.7.B, 4.MD.A.3; MP2, MP3, MP7

TEKS: 3.8A, 4.1D, 4.5D, 5.4H

Queen of Manta Rays

This scientist goes diving to study some of the world’s biggest fish

Andrea Marshall/Wired.com

Marshall snapped this photo of a diver posing with a manta ray off the coast of Ecuador. Remoras, also known as suckerfish, are attached to the mantaʼs underside to feed on skin bacteria.

Andrea Marshall was 17 the first time she saw a manta ray. She was scuba diving in Costa Rica when one of the huge, diamond-shaped fish swooped right over her head. “It completely took my breath away,” she says. “It was the most beautiful and strange and graceful animal I’ve ever seen.”

Marshall has loved the ocean since she was a little kid in California. She became certified as a diver on her 12th birthday—the soonest it was allowed. Now, as a marine biologist, Marshall travels the world studying manta rays. She’s one of the lead scientists at the Marine Megafauna Foundation in the southeast African country of Mozambique.

Andrea Marshall was 17 when she saw her first manta ray. She was scuba diving in Costa Rica. The huge, diamond-shaped fish swam right over her head. “It completely took my breath away,” she says. “It was the most beautiful and strange and graceful animal I’ve ever seen.”

Marshall has loved the ocean since she was little. She grew up in California. She became certified as a diver on her 12th birthday. That was the soonest it was allowed. Now Marshall is a marine biologist. She travels the world studying manta rays. She’s one of the lead scientists at the Marine Megafauna Foundation. It’s based in Mozambique, a country in southeast Africa.

Marshall started out studying sharks, manta rays’ close relatives. But when she was in graduate school, she joined a study to count the manta ray population. She was surprised to learn that scientists knew very little about the animals. “I was like, ‘How is that possible?’” she says. She decided to make learning about manta rays her career.

Marshall used to study sharks. They’re closely related to manta rays. Then she went to graduate school. She joined a study to count the manta ray population. She learned that scientists knew very little about the animals. That really surprised her. “I was like, ‘How is that possible?’” she says. She decided to study manta rays herself.

Courtesy of Andrea Marshall

Andrea Marshall

Marshall started making dives to observe manta rays in 2006. At first, she thought the fish stayed in shallow coastal waters and never traveled far from home. In 2008, she started fitting the rays with GPS tags that reported their location. The first one she tagged moved 680 miles in 10 days and dove 4,500 feet—making it one of the deepest-diving ocean animals. “Everything we thought we knew about mantas changed,” she says.

Marshall started diving to observe manta rays. Her first dive was in 2006. At first, she thought mantas stayed in shallow water. She didn’t think the fish ever traveled far from the coast. In 2008, she started putting GPS tags on manta rays. The tags tracked the location of each fish. The first manta she tagged moved 680 miles in 10 days. It dove 4,500 feet underwater. That made it one of the deepest-diving ocean animals. “Everything we thought we knew about mantas changed,” says Marshall.

Courtesy of Andrea Marshall

Photographing manta rays helps Marshall identify them. Each individual has a different set of markings.

Manta rays are curious animals, says Marshall. When they see her in the water, they swim over to check her out. Unfortunately, humans can also harm the animals. Some fishermen kill mantas for their gill rakers, the feathery mouthparts mantas use to catch food in the water. The parts are sold as medicine in some areas of Asia. Manta ray numbers are decreasing as a result of this threat.

Now Marshall is doing everything she can to help manta rays. She works with people in different countries to create protected areas where fishing isn’t allowed. She also keeps diving and studying the animals. “There’s so much left to discover,” she says.

Manta rays are curious animals, says Marshall. They often notice her in the water. They swim over to check her out. Unfortunately, humans can harm the animals. Some fishermen kill mantas for their gill rakers. Mantas have these feathery parts in their mouths. They use them to catch food in the water. The parts are sold as medicine in some areas of Asia. Manta ray numbers are decreasing as a result.

Now Marshall is doing everything she can to help manta rays. She works with people in different countries to create protected areas. Fishing isn’t allowed in these places. That means more mantas survive. Marshall also keeps diving and studying the animals. “There’s so much left to discover,” she says.

1. Press the foil square flat on the desk. Use the ruler to measure one edge of the square. Then measure the other edge next to it. Multiply the two measurements to calculate the area of the foil. Record the area.

2. Fill the mixing bowl three-quarters full with water. Lay the foil in the water so it floats.

3. One by one, gently drop pennies into the center of the foil. Count how many pennies you can add before the foil sinks. Record this number.

4. Remove the pennies from the water, then lift out the foil and place it on a paper towel. Carefully press it flat.

5. Take each corner of the foil and fold it into the center to make a smaller square. Then repeat steps 1 through 4.

6. Fold the foil again to make an even smaller square. Then repeat steps 1 through 4.

1. Press the foil square flat on the desk. Use the ruler to measure one edge of the square. Then measure the other edge next to it. Multiply the two measurements to calculate the area of the foil. Record the area.

2. Fill the mixing bowl three-quarters full with water. Lay the foil in the water so it floats.

3. One by one, gently drop pennies into the center of the foil. Count how many pennies you can add before the foil sinks. Record this number.

4. Remove the pennies from the water, then lift out the foil and place it on a paper towel. Carefully press it flat.

5. Take each corner of the foil and fold it into the center to make a smaller square. Then repeat steps 1 through 4.

6. Fold the foil again to make an even smaller square. Then repeat steps 1 through 4.

How many pennies could the foil hold at each size? Display your results in a bar graph.

How many pennies could the foil hold at each size? Display your results in a bar graph.

1. Which foil square held the most pennies?

2. The weight of the foil didn’t change during this experiment. How did its ability to float change as you changed the square’s size?

3. Based on your results, why do you think a manta ray is shaped the way it is?

1. Which foil square held the most pennies?

2. The weight of the foil didn’t change during this experiment. How did its ability to float change as you changed the square’s size?

3. Based on your results, why do you think a manta ray is shaped the way it is?

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