Marine Life

A:

Of the 15,000 species of bivalves known as clams, some have life cycles of only one year. Individuals of one species called the ocean quahog, or Arctica islandica, however, are among the oldest living animals on Earth, with one captured specimen measured to be more than 500 years of age.

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  • How do sea stars eat?

    Q: How do sea stars eat?

    A: Sea stars eat either by turning their stomachs inside out and releasing digestive enzymes onto prey or by catching drifting food items and moving them down to their mouths. Sea stars are slow-moving animals, so any prey must be similarly slow-moving or even unmoving. Many sea stars specialize in feeding on slow-moving or sessile bivalves such as clams and mussels or even on other sea stars.
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  • How do dolphins use echolocation?

    Q: How do dolphins use echolocation?

    A: Dolphins use echolocation for communicating with one another and for locating objects in their surrounding environments. Regardless of whether dolphins use echolocation for social purposes, such as communication, or for finding and avoiding obstacles, the mechanism of echolocation uses the same techniques. Dolphins generate beams or waves of clicking sounds, then pause to wait for a response, either from another dolphin or from an object.
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  • Where do sharks live?

    Q: Where do sharks live?

    A: Sharks are found in every ocean in the world and are sometimes found out of their habitat in rivers and streams. There are around 368 species of sharks in the world.
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  • How do crayfish protect themselves?

    Q: How do crayfish protect themselves?

    A: Crayfish, which are freshwater crustaceans closely related to lobsters, have large claws with which they threaten predators and protect themselves. In addition, when crayfish are frightened, they make menacing gestures with their claws, propel themselves backwards and use their tails to throw mud at their enemies.
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  • What do sand dollars eat?

    Q: What do sand dollars eat?

    A: Sand dollars eat tiny bits of organic material they find on the sea floor. Sand dollars are echinoderms, which means they have spines. They get the name "sand dollar" because their skeletons look like large coins when they wash up on the beach.
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  • What are types of aquatic animals?

    Q: What are types of aquatic animals?

    A: Types of aquatic animals include marine mammals such as whales, dolphins, sea lions, seals, manatees and walruses. Other types are fish, including bony fish such as groupers and cartilaginous fish such as sharks and rays. Invertebrate aquatic animals include sponges, corals, sea stars, sea anemones, sea urchins and sea cucumbers. Other examples include sand dollars, jellyfish and colony animals such as the Portuguese man-of-war, marine worms, clams, mussels and barnacles.
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  • What is the function of gills in crayfish?

    Q: What is the function of gills in crayfish?

    A: Crayfish use their gills to breathe. A crayfish has a gill at the base of each leg. These gills are very delicate and are covered by the crayfish's carapace, or shield. This carapace is aligned backwards from the head, allowing water to run through in a channel over the gills, which provides a continuous source of oxygen that allows the crayfish to breathe.
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  • How much food does a baby seahorse eat a day?

    Q: How much food does a baby seahorse eat a day?

    A: Like adult seahorses, seahorse babies, which are also known as fry, eat a lot of food in a single day; these tiny creatures can eat as much as 3,000 pieces of food a day. As adults, seahorses will typically eat on no fewer than 30 occasions per day, with as many as 50 eating episodes taking place in a 24-hour period. This voracious appetite is related to the fact that the seahorse has no stomach and has a digestive system that has been described as inefficient, meaning this sea creature must eat a lot in order to stay properly nourished.
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  • What are some facts about manatees?

    Q: What are some facts about manatees?

    A: Manatees are large, slow-moving aquatic mammals. They swim at speeds of about 5 mph, although they can triple that speed in very short bursts. Although slow, they are excellent swimmers, and are able to perform nimble water gymnastics.
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  • What are the types of eels?

    Q: What are the types of eels?

    A: There are several species of eels, which fall into the families of either freshwater or saltwater eels. The two eel families are the family Anguillidae and the family Moninguidae. Eels in the first family share a common genus and reside primarily in North America; those in the latter class generally live in tropical locales and have different body shapes.
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  • What are the differences between dolphins and porpoises?

    Q: What are the differences between dolphins and porpoises?

    A: A dolphin's slimmer body, beak-like nose and curved fins distinguish it from the porpoise's stout build, rounded face and triangular fins, according to the National Ocean Service. Although they are different species, dolphins and porpoises both belong to order Cetacea. Approximately 32 dolphin species have been discovered, while only six known porpoise species exist.
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  • How does a whale shark protect itself?

    Q: How does a whale shark protect itself?

    A: A whale shark protects itself with its enormous size and its skin of up to 6 inches in thickness. The whale shark grows very quickly. It is a filterfeeding species of shark.
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  • What do seahorses eat?

    Q: What do seahorses eat?

    A: Seahorses feed on small crustaceans. Some of the favorites for seashores are shrimp and zooplankton, though they will eat nearly any live food.
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  • What is the biggest animal in the ocean?

    Q: What is the biggest animal in the ocean?

    A: The biggest animal in the ocean, and possibly the largest animal ever to live on Earth, is the blue whale. The maximum recorded weight for a 98-foot blue whale exceeded 209 tons. Longer whales, up to 110 feet, have been seen but not weighed.
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  • What do piranhas eat?

    Q: What do piranhas eat?

    A: Piranha are carnivores that eat live prey and can also feed on insects, plants and even their own kind. These voraciously hungry fish tend to have a lurk-and-ambush style of attack that occurs en masse, with large groups of piranha feeding at once.
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  • What kind of predators does a sea snake have?

    Q: What kind of predators does a sea snake have?

    A: Birds of prey, sharks, large fish, eels and crocodiles are predators of the sea snake. Sea snakes live in shallow waters and breathe air using a long lung that also assists in buoyancy. Although the sea snake isn't aggressive, it produces some of the deadliest venom in the world.
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  • What do bottle nose dolphins eat?

    Q: What do bottle nose dolphins eat?

    A: Coastal bottlenose dolphins prefer bottom-dwelling fish and invertebrates, while offshore dolphins eat a variety of fish and squid. More ingenious feeders have been known to trail fishing boats, in the hopes of snagging some leftovers.
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  • How do animals communicate underwater?

    Q: How do animals communicate underwater?

    A: According to Discovery of Sound in the Sea, animals use sound to communicate underwater. They emit different types of sounds and gather information on their surroundings by the echoes from those sounds, a process called echolocation.
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  • How big was the largest lobster ever recorded?

    Q: How big was the largest lobster ever recorded?

    A: The biggest recorded lobster ever caught weighed 44 pounds, 6 ounces and was caught in 1977. According to the Guinness Book of World Records, it was taken from the waters off the coast of Nova Scotia, and it measured 3 feet 5 inches from the tip of its largest claw to the end of its tail fan.
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  • How long can a leopard seal hold its breath?

    Q: How long can a leopard seal hold its breath?

    A: According to National Geographic, a leopard seal can hold its breath for up to 10 minutes. This is due to an adaptation that allows the seal to store an extremely large amount of oxygen within the blood and muscles, about three times as much as humans based on weight.
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  • What color is coral?

    Q: What color is coral?

    A: Coral is a colorless marine animal that lives on the ocean floor and can be red, orange and other colors. Any color that appears to be present on coral is a buildup of algae that live on the coral. Like other animals of the sea, coral can change color with emotion.
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