Marine Life: Most Popular Articles
Starfish - sea stars - are marine invertebrates that are a variety of colors, shapes and sizes, although all resemble a star. Starfish are familiar marine animals and fascinating creatures. Here are 10 facts about starfish, including one about how they are not actually a fish.
There are about 86 species of cetaceans - whales, dolphins and porpoises in the Order Cetacea, which is further divided into two sub-orders, the Odontocetes and the Mysticetes. Learn about and see photos of featured cetacean species.
Facts about seahorses, including the number of seahorse species, where seahorses live, what they eat and how they reproduce.
Facts about scallops. Learn about where scallops live, how big they grow, what they eat and how they reproduce. When you eat a scallop, what part are you actually eating?
There are several hundred species of sharks, ranging in size from less than ten inches to over 50 feet. Learn shark facts about these amazing fish with a fierce reputation, but fascinating biology.
Learn why a killer whale - orca's - dorsal fin collapses, or flops over, when it is in captivity.
Do sharks lay eggs? Here you can learn about ways sharks reproduce, including whether they lay eggs or give birth to live young.
The whale shark is the world's biggest fish, maxing out at about 65 feet in length and weighing up to about 75,000 pounds.
What is the deepest part of the ocean? Learn about the ocean's deepest point, how deep it is, and what lives there.
What is the salary of a marine biologist? Learn about a marine biologist's job and salary range.
An adaptation is a physical or behavioral characteristic that has developed to allow an organism to better survive in its environment.
Sharks need to keep water moving over their gills so that they receive oxygen. So that seems to mean that they need to keep moving all the time...or do they? How do sharks sleep? Even though sharks need to keep water moving over their gills to receive oxygen, some sharks need to keep moving to do this, while others don't. Either way, sharks, like other marine animals, don't seem to fall in a deep sleep like we do.
Sea turtles are classified in the Class Reptilia, Subclass Anapsida and Order Testudines. There are seven recognized species of sea turtles, six of which (the hawksbill, green, flatback, loggerhead, Kemp's ridley and olive ridley turtles) are in the Family Cheloniidae, with only one (the leatherback) in the Family Dermochelyidae. All seven species of sea turtles are listed under the Endangered Species Act.
When you picture a marine biologist, what comes to mind? Many picture a dolphin trainer, or maybe Jacques Cousteau. But marine biology covers a wide range of activities and organisms, and so does the job of a marine biologist. Here you can learn what a marine biologist is, what marine biologists do, and how you can become a marine biologist.
When you think of lobster, do you think of a bright red crustacean on your dinner plate, or a territorial creature roaming caves in the ocean? Despite their fame as a delicacy, lobsters also have fascinating lives. Learn some lobster facts about this iconic marine creature here.
Marine algae, more commonly known as seaweeds, come in all shapes and sizes. Here is an introduction to brown, red and green algae with some examples of each type of seaweed.
There are thousands of species of marine life, from tiny zooplankton to enormous whales. Each is adapted to the specific habitat it occupies. Throughout the oceans, marine organisms must deal with several things that terrestrial life do not, including regulation of salt, obtaining oxygen, and adapting to water pressure. Learn about ways marine organisms survive in the oceans.
What is the fastest fish in the ocean? Learn the answer here.
The group of marine life known as crustaceans includes crabs, lobsters and shrimp - some of the most important marine life to humans. It also includes other animals such as amphipods and isopods. The crustaceans are in the Phylum Arthropoda and Subphylum Crustacea. Here you'll find the definition of crustacean and learn more about crustaceans.
What do seahorses eat? Marine Life.
Facts about the brittle stars, basket stars and serpent stars, marine invertebrates that belong to the Class Ophiuroidea, the group of marine invertebrates that contains the brittle stars and basket stars. Learn where brittle stars and basket stars live, how they feed, and how they reproduce.
There are seven recognized species of sea turtles, and all are endangered. Learn facts about sea turtles, including where they live, how they reproduce, and what they eat.
Seals are divided into two families, the Phocidae, the earless or ‘true’ seals (e.g., harbor or common seals), and the Otariidae, the eared seals (e.g., fur seals and sea lions). This article contains facts about both types of seals.
Red algae are, not surprisingly, red, purplish or reddish in color. There are about 6,000 species of red algae and they are classified as protists in the phylum Rhodophyta. Red algae species range from simple one-celled organisms to complex, plant-like organisms.
The intertidal zone is the area where land and sea meet, and often includes tide pools. Learn about the unique intertidal zone, tide pools, the types of marine life that live in the intertidal and threats to this habitat.
Learn about the term marine biologist - what a marine biologist is, what marine biologists do, steps to becoming a marine biologist, and how much marine biologists earn.
Whale shark facts. Facts about whale sharks, including where whale sharks live, what whale sharks eat, where to see whale sharks, and how whale sharks reproduce.
Whales are voluntary breathers, meaning they think about every breath they take. That means they can't sleep the way we do. Learn how cetaceans (whales, dolphins and porpoises) sleep, or rest.
Information about starfish, including facts about starfish species, images, starfish habitat, feeding and reproduction.
Echinoderms, or members of the Phylum Echinodermata, are some of the most easily-recognized marine invertebrates, many of which are found in tide pools or in the touch tank at your local aquarium. The Phylum Echinodermata includes 4 classes: Stelleroidea (sea stars), Echinoidea (sea urchins and sand dollars), Holothuroidea (sea cucumbers) and Crinoidea (sea lilies and feather stars.) They are a diverse group of organisms, containing about 6,000 species.
Almost three-quarters of the Earth is ocean. Here you can learn facts about the ocean, about the major oceans of the world, and what the ocean is like as a marine life habitat.
There are 32 species of seals. Here are 5, including Harbor seals (also called common seals). with links to further information.
Protists are organisms in the kingdom Protista. These organisms are eukaryotes, meaning they are made up of single or multiple cells which all contain a nucleus enclosed by a membrane.
Learn the definition of the term marine biologist. Learn where marine biologists work, what they do, how to become a marine biologist, and what marine biologists get paid.
Do starfish have eyes? Information about starfish (sea star) eyes. While it may appear that starfish have eyes, they do. Learn where the eyes are on a starfish.
Want to know the sex of a lobster you've caught or are about to eat? Here's how to tell. Lobsters have feathery appendages called swimmerets underneath their tail. These swimmerets help a lobster swim and are also where a female lobster carries her eggs. Swimmerets also can clue you in to the sex of a lobster.
How do dolphins sleep? Find out about how dolphins sleep - you may be surprised at the answer.
Green algae range from simple, one-celled organisms to complex, multi-celled organisms. They may also live in large colonies. There are both marine and freshwater green algae species, although we will focus on the marine species here.
What is a cartilaginous fish? Learn about cartilaginous fish - the group of fish that includes elasmobranchs: sharks, rays and skates.
Whales are mammals, and one of the characteristics common to all mammals is the presence of hair. There are over 80 species of whales, and hair is only visible in some. Whales have hair on their heads as fetuses, but they don't always keep it.
Learn about the ocean sunfish - mola mola - how big it is, where it lives, what it eats, and how it reproduces.
class="no-js" itemscope itemtype="http://schema.org/Article" > itemprop="description" >Definition: "Plankton"
Photo of a Basket Star. Marine Life. Page 3.
Brown algae is the largest, most complex type of algae. This type of marine algae is brown, olive or yellowish-brown in color. Brown algae contains contains chlorophyll a and c and a pigment called fucoxanthin, which gives it its color. Types of algae include kelp, rockweeds and wracks in the genus Fucus and free-floating algae in the genus Sargassum.
The whale shark is the world's biggest shark species. Growing to a length of about 65 feet and weighing about 75,000 pounds, this streamlined fish is really a gentle giant.
Cetaceans - whales, dolphins and porpoises - are a diverse group of animals ranging in size from just a few feet long to over 100 feet long. While most whales spend their lives offshore in the ocean's pelagic zone, some inhabit coastal areas and even spend part of their lives in fresh water. Learn about how whales feed, reproduce and explore their world.
The biggest animal in the ocean, and in the world, is the blue whale (Balaenoptera musculus), a sleek, light-colored giant. The blue whale gets its name from its skin, which is a mottled blue-gray color.
What do nudibranchs eat? How do nudibranchs reproduce? Learn more about these fascinating sea slugs that live in all the world's oceans.
Learn 10 fascinating facts about sea otters.
What type of sharks are most likely to attack? Of the hundreds of shark species, there are 3 most often implicated in unprovoked shark attacks on humans. Learn more about these three species, and how you can prevent a shark attack.
The Class Gastropoda includes snails, slugs, limpets and sea hairs - all animals referred to as 'gastropods.' Learn about gastropods and see some examples here.
Learn how pearls form, including species that make pearls.
Learn 10 facts about killer whales (orcas).
What do sea otters eat? Learn the answer here.
Conchs are a type of sea snail, and are also a popular seafood in some areas. The term 'conch' (pronounced
Where do polar bears live? Find out more.
Learn about the various species of hammerhead shark, all of which have an interestingly shaped head. They range in size from about 3 to 20 feet long.
Sea turtles are reptiles that live in a marine or brackish environment. Learn about sea turtle reproduction, distribution, classification and conservation status.
Manatees are herbivores, feeding primarily on aquatic plants. Learn about the types of food manatees eat.
Sea turtles have shells to protect them, right? So what would eat a sea turtle? A sea turtle's shell only goes so far to protect them. Unlike land turtles,
The term phylum is one of seven major categories that are used to classify organisms. In order of broad to specific, these seven categories are: Kingdom, Phylum, Class, Order, Family, Genus, and Species. This classification system was developed by Carolus Linnaeus in the 18th century
Facts about the hawksbill sea turtle, including information on the hawksbill turtle's natural history, reproduction, distribution and conservation. The hawksbill sea turtle (Eretmochelys imbricate) grows to lengths of 3.5 feet long and weights of up to 180 pounds.
Dolphin information - learn about dolphins through 10 fascinating facts.
Whales are mammals. They are endothermic (warm-blooded), give birth to live young and nurse them, breathe oxygen from air, and have hair. Details here.
Tunas are large, powerful fish that are distributed worldwide from tropical to temperate oceans. They are members of the family Scombridae, which includes both tunas and mackerels. Learn about the several species of fish known as tuna, and their importance commercially and as gamefish.
Is it a whale, dolphin or porpoise? These terms are often used interchangeably, but there is a difference. Learn about the terms whale, dolphin and porpoise and how they are used to describe different members of the order Cetacea.
The blue whale is the largest animal in the world. Learn where blue whales live, what they eat, how they reproduce, and how many are left in the world.
Did you know that sponges are animals? There are thousands of species of sponges, and here you can learn about why these organisms are considered animals, how sponges are classified, how they feed and reproduce, and where they live.
Profile of the common sea star or northern sea star, including information on classification, diet, reproduction, habitat and distribution.
Learn about types of marine mammals, including whales, dolphins, porpoises, sirenians including manatees and dugongs and pinnipeds including seals and sea lions.
Definition of ectothermic. An ectothermic animal is one who cannot regulate its own body temperature, so its body temperature fluctuates according to its surroundings.
Ovoviviparous animals produce eggs, but instead of laying the eggs, the eggs develop within the mother's body and are birthed live.
Learn about the types of sharks with this list of sharks species and facts about each.
description and characteristics of bony fish - marine life overview
The white shark, commonly called the great white shark, is one of the most iconic and feared predators of the ocean. With its razor-sharp teeth and menacing appearance, it certainly looks dangerous. But the more we learn about this creature, the more we learn they are not indiscriminate predators, and definitely don't prefer humans as prey. Learn here about the great white shark, its biology, feeding, reproduction and distribution.
The shortfin mako shark (Isurus oxyrinchus) appears to be the fastest shark species. Learn more about this speedy shark and other fast shark species.
Byssal, or byssus threads are strong, silky fibers made from proteins that are used by mussels to attach to rocks, pilings, or other substrates.
Many people became familiar with the disastrous effects of oil spills in 1989 after the Exxon Valdez incident in Prince William Sound, Alaska. That spill is considered the worst oil spill in U.S. history -- although the 2010 BP leak in the Gulf of Mexico could prove to be even worse. Overall, the effects of an oil spill on marine life depend on a variety of factors, but can include hypothermia, poisoning, increased predation and other stressors, as well as effects on marine habitat.
Learn about the type of marine life called skates. Where do skates live? How do they eat and reproduce? Find out more by reading this marine life profile of skates.
The term elasmobranch refers to the sharks, rays and skates, which are in the subclass Elasmobranchii and class Chondrichthyes. The Condrichthyes class includes only one other subclass, the Holocephali (chimaeras), which are unusual fish found in deep water.
Within the oceans, there are many different types of habitat, or environments in which plants and animals live, ranging from freezing polar ice to tropical coral reefs. These habitats all come with their unique challenges and are inhabited by a wide variety of organisms. Learn more about important marine life habitats including mangroves, the intertidal zone and tide pools, coral reefs, seagrasses, the open ocean - pelagic zone, the deep sea and hydrothermal vents.
All of our actions, no matter where we live, effect the ocean and the marine life it holds. Even if you live far inland, there are many things you can do that will help marine life. Learn about easy ways that you can help protect marine life, including recycling fishing line, eating sustainable seafood and reducing your carbon footprint.
Spiracles are found in bottom-dwelling sharks and rays. Spiracles are a pair of openings just behind the animal's eyes that allow it to draw oxygenated water in from above.
What is a dolphin? Learn about dolphins, including how many species of dolphins there are, and characteristics of dolphins.
Learn about the distribution of killer whales (orcas), and where you could see killer whales.
Learn about whales - what are they, how many kinds of whales are there, and other facts about whales.
What is inside a sand dollar shell? Here you can find out.
Learn about the Phylum Mollusca - the mollusks.
Currently, there are 47 recognized species of seahorses. This article gives a sampling of some of these species, including some most common in the United States. There is basic identification and range information in each description, with links to more detailed profiles.
Definition of radial symmetry. Learn what radial symmetry is and in which marine organisms it occurs.
Learn 5 facts about the leatherback turtle - the largest sea turtle.
Marine biology is the scientific study of plants and animals that live in salt water. When many people think about a marine biologist, they picture a dolphin trainer. But marine biology is so much more. Learn about the field of marine biology, a marine biologist's tools and the importance of studying the oceans and their marine life and habitats.
Learn about the characteristics of kelp, and its importance. including examples and links to further reading, with our expert guide to marine life.
Learn about Winter, the bottlenose dolphin with the artificial tail. Winter is a bottlenose dolphin that lives at the Clearwater Marine Aquarium in Florida, and stars in Dolphin Tale.
Sea Star Image - Photo of a Sea Star. Page 10.
Starfish, or sea stars, are star-shaped animals that are a variety of shapes, sizes and colors. You might be most familiar with the starfish that live in tide pools in the intertidal zone, but some starfish live in deep water. Learn about sea star classification, reproduction and feeding here.
Cetacean is a word used to describe all whales, dolphins and porpoises in the order Cetacea. Learn about the characteristics of cetaceans, including baleen whales and toothed whales and how they survive in the oceans.
What is the largest fish? Learn about the largest fish in the world.
Coral reefs provide some of the most spectacular underwater scenery, and marine life biodiversity in the world. Here you can learn about coral, how coral reefs form, and threats to coral reefs such as coral bleaching and ocean acidification.
Find a sand dollar shell (test) on the beach? Here you can learn all about sand dollars - what they are, where they live, what they eat and how they reproduce.
What do polar bears eat? Learn more about the species that polar bears eat along with other facts about polar bears.
Learn about the 14 species of baleen whales,and click through to species profiles and images.
An apex predator is an animal who, as an adult, has no natural predators in its ecosystem. The great white shark is an example of an apex predator. Apex predators play an important role in keeping ecosystems in check. Learn more about apex predators and why they are important.
Sea Star Regenerating Three Arms. Page 6.
A mollusk is an animal classified in the Phylum Mollusca. Here you can learn more about mollusks and find examples of mollusks.
Definition of endothermic. Endothermic animals are those that must generate their own heat to maintain their body temperature. These animals are commonly referred to as warm-blooded.
Information about the cnidaria - the phylum that contains corals, jellyfish, sea anemones, sea pens and hydras. Learn about cnidaria facts, life cycles, where cnidaria are found and examples of cnidarians.
Learn about coral reefs. Coral reefs are a center for biodiversity and an important marine habitat. Tropical corals, cold-water corals, the marine life species that inhabit them and the natural and human threats to coral reefs in the oceans are discussed here.
Learn about the diverse group of whales known as the toothed whales, which includes the dolphins and porpoises. Click through to profiles of each species to learn even more.
Review of Clearwater Marine Aquarium in Clearwater, FL, the home of Winter the dolphin and her friend Hope, and a number of other rescued dolphins, sea turtles and other marine life. Learn what to expect at Clearwater Marine Aquarium, a rescue and rehabilitation facility.
Learn 10 facts about polar bears.
While its name may be deceiving, the whale shark is actually a shark, and the largest fish in the world. Whale sharks can grow to 65 feet in length and up to about 75,000 pounds in weight. Females are generally larger than males
Facts about the green sea turtle, including information on the green turtle's natural history, reproduction, distribution and conservation. The green sea turtle (Chelonia mydas) weighs up to 350 pounds and their carapace can be many colors, including shades of black, gray, green, brown or yellow.
Sea turtles are reptiles that live in a marine or brackish environment. The flippers of sea turtles are long and paddle-like, making them excellent for swimming but poor for walking on land. There are seven species of sea turtles, several of which inhabit U.S. waters. View images of sea turtles here.
starfish, sea star, echinoderm, marine invertebrates. Page 4.
Overfishing is, simply put, when so many fish are caught that the population can't reproduce enough to replace them. Overfishing can lead to depletion of or extinction of fish populations.
Baleen is a strong, yet flexible material made out of keratin, a protein that is the same material that makes up our hair and fingernails.
There are over 80 recognized species of whales, dolphins and porpoises, or cetaceans, and these species are divided into two main groups: the baleen whales and the toothed whales. While they are all considered whales, there are some important differences between the baleen whales and toothed whales.
Do you know the names of the world's oceans? Here you'll find a list of the oceans of the world, along with where the oceans are found and how big they are.
The killer whale, also known as the orca
Gastropods are animals in the Class Gastropoda - the group of organisms that includes snails, slugs, limpets and sea hares. There are over 40,000 species in this class. Envision a sea shell, and you're thinking about a gastropod, although this class contains many shell-less animals as well. Here is a round-up of information on gastropods, including their taxonomy, feeding, reproduction and examples of gastropod species.
Read about the meaning of placoid scales and how they differ from the scales of bony fish. Know the alternative name for these scales.
Some think of lobster as a bright red delicacy served up with a side of butter. But the American lobster
There are over 80 species of whales, and each has their own movement patterns, but in general, whales migrate toward the colder poles in the summer and toward the more tropical waters of the equator in the winter. This pattern allows whales to take advantage of the productive feeding grounds in colder waters in the summer, and then when productivity lowers, to migrate to warmer waters and give birth to calves.
The mantle is an important part of the body of a mollusk. It forms the outer wall of the mollusk's body and encloses the mollusk's visceral mass (internal organs), and secretes calcium carbonate to form the mollusk's shell.
The leatherback turtle is a in a class of its own. Rather, it is in its own family. Out of the 7 species of sea turtles, the leatherback is the only one in the family Dermochelys. This is the largest sea turtle, and could also dive alongside some of the deepest-diving whales.
The bowhead whale (Balaena mysticetus) got its name from its high, arched jaw that resembles a bow. Bowheads are a cold-water whale that lives in the Arctic. Bowheads are still hunted by natives whalers in the Arctic. Learn about the bowhead whale's distribution, feeding habits, reproduction and conservation status.
The deep sea includes the deepest, darkest, coldest parts of the ocean. Eighty percent of the ocean consists of waters in the deep sea greater than 1,000 meters in depth. Deep sea areas are cold, dark, and inhospitable to us humans, but support a surprising number of species that thrive in this deep sea environment. Learn more about what is considered the deep sea, how deep the deepest part of the ocean is, and what challenges marine life face in the deep sea.
Lobsters are usually a brownish-green in the wild. What happens between the sea and the dinner table to turn them bright red?
What is a starfish? Learn about starfish, or sea stars.
Information about the animals in the Phylum Chordata, which includes the vertebrates and animals that have a notochord at some stage in their development. Includes examples of animals that are in the Phylum Chordata.
Northern Sea Star (Asterias vulgaris). Page 9.
Atlantic bluefin tuna are a large, fast, streamlined fish that lives in the pelagic zone. They are a popular sportfish due to demand for tuna for sushi and other dishes. Atlantic bluefin tuna can swim at speeds up to 50 mph. Learn facts about bluefin tuna, including tuna classification, habitat, distribution and conservation.
Tough scales that cover the skin of elasmobranchs (sharks and rays). Even though similar to scales,they're really modified teeth,covered with a hard enamel.
Facts about the flatback sea turtle, including information on the flatback turtle's natural history, reproduction, distribution and conservation.
Information about stony corals, the corals that form coral reefs. Stony corals, also called hard corals (as opposed to soft corals, like sea fans), are the reef-builders of the coral world. Learn more about stony corals - what they look like, how many species there are, and where they live.
The basking shark is the second-largest shark species, and can reach lengths up to 30-40 feet and weights up to about 8,000 pounds. They are filter-feeders who are often seen feeding near the surface with their huge mouths agape.
Seagrass is an angiosperm (flowering plant) that lives an a marine or brackish environment. There are about 50 species of true seagrasses worldwide and they are found within the plant families Posidoniaceae, Zosteraceae, Hydrocharitaceae, and Cymodoceaceae. Seagrasses require lots of light, so the depths at which they occur in the ocean are limited by the availability of light. Seagrasses are found in protected coastal waters such as bays and lagoons.
Image of Northern Sea Stars and Green Sea Urchins. Page 7.
Facts about cuttlefish, a cephalopod that lives in tropical and temperate waters and has amazing camouflage abilities.
A body of water created where fresh water from a river mixes with the salt water of the ocean.
The Class Reptilia refers to the reptiles - a diverse group of animals that are "cold-blooded" and have
Learn about the blue whale - the largest creature on the planet. Facts about blue whales include the blue whale's size, diet and conservation status.
Definition of bilateral symmetry as it is used in referring to marine life, with examples.
The open ocean, or pelagic zone, is the area of the ocean outside of coastal areas, and where you’ll find some of the biggest marine life species, including whales, bluefin tuna, and giant squid.
Want to learn about invertebrates? Here you can learn the definition of invertebrates, characteristics of invertebrates, and examples of invertebrates.
Humpback whales (Megaptera novaeangliae) are found in all the world's oceans. Learn about the humpback whale and its behaviors, including feeding, reproduction and communication.
Brittle Star Image Marine Life. Page 8.
Information about the blue button jelly, which is not really a jellyfish, but a hydroid. Learn where blue button jellies are found, what they eat, how they reproduce, and if they're dangerous to humans.
Chordata is the phylum that includes all the animals that have a notochord, or nerve cord, at some stage of their development. Animals in this phylum are known as chordates. The most well-known chordates are the vertebrates - animals that have a spine.