Chromatophores enable an octopus to camouflage itself with its surroundings by changing the appearance of its epidermis. FACT: Octopi are cephalopods. Cephalopods are a class of mollusc that includes squids, cuttlefish, nautilus, and octopi. Cephalopods are bilaterally symmetrical and have a head, arms, and in some cases, tentacles. FACT: Octopi are highly intelligent.
The octopus also belongs to a sub-species of mollusks called the cephalopods. “Cephalopod means “head-foot,” in reference to the circle of arms or tentacles surrounding the head, which is well defined and bears the two prominent eyes. The head is hidden behind the bases of the arms. A mantle of thick skin and muscle surrounds a squat, dome-shaped or sometimes roughly egg-shaped body.” (Idyll 143) The body of an octopus is very complex and somewhat similar to the squid. “When all the modern cephalopods except the nautilus discarded their external shells, they lost something in protection.
At a whopping forty-six feet and a massive fifteen tons, you can see why the whale shark is called they whale shark. The whale shark is the biggest shark and the biggest fish in the ocean (The Whale Shark Bibliography – Tethys Marine). As you can see it is not a whale. It has a mouth, which is around 4 feet wide. Its mouth is at the front of the head and not underside like most sharks.
Most of the adult of this species are feeding on the marine plants life such as kelp and the algae while the young prefer more carnivores feeding style. In addition, they also may migrate in long distance in order to obtain their foods covered by from feeding ground to the hatching beaches. In addition, their adult can grow up to 1.5 metres long with the average weight from 68 to 190 kg. Physically they have the flattened body which covered by a large teardrop-shaped carapace with a pair of large paddle-like flippers that are usually light in colour. This reptiles also have the short neck.
2. Body mechanism • Respiration: Gas exchange takes place through the body surfaces. Cnidarians do not have gills or gill like structure • Reproduction: Sea Anemones reproduce by lateral fission (in which an identical animal sprouts out of the anemone's side) and by sexual reproduction (in which anemones release eggs and sperm, producing free-swimming larvae). Sea anemones reproduce by budding off baby sea anemones. The babies stay connected to the adult until it is old enough to go out on their own.
A shark’s and a whale’s fin helps it swim and glide in the water but a whale’s fin can move up and down because of the joints. A shark’s fin can’t move because its just cartilage, it stabilizes the shark in the water. That is a homologous structure between a whale and a shark. Vestigial Structure Whales are mammals just like humans, dolphins and cats. Mammals have lungs, breathe air, and have warm blood.
Animalia are also multicellular organisms, and they can sexually reproduce. The complexity of animalia range from the uncomplex sea sponges all the way to very advanced human beings. Phylum molluska is the third level of taxonomic classification of which octopus are a member. Mollusks are known for their bilaterally symmetric soft bodies. The soft mollusk body is usually protected by a hard outer calcium carbonate shell, however there are some variations regarding the shell as you will see in the following paragraphs.
Heather Capp Dr. Campese Psych 300 October 20, 2012 Electroreception in Sharks Electroreception is an acute sensitivity to bioelectric fields found primarily in aquatic vertebrates as either a passive or active skill. Electroreceptive animals make use of weak electric currents chiefly to locate objects around them, particularly prey .This ability can also be used to avoid predation and in geomagnetic navigation. Sharks, like other members of the Elasmobranch family, possess electroreceptors called ampullae of Lorenzini, which are scattered over their heads in distinct clusters. They are an extension of the lateral line, which is a long, hollow sensory organ stretching down sharks’ sides from gill to tail with perforated scale openings, allowing the sharks to sense water pressure, direction, and displacement. Ampullae of Lorenzini are used in passive electroreception, which utilizes the animate and inanimate electric fields generated by the activity of nerves and muscles in other animals in order to detect them.
They also have very large eyes. In proportion to any other animal they have the largest eye-to-body ration of any animal in the world. Vampire squid move through the water by propulsion (sucking in and pushing out water through a specialized siphon jet located under its mantle) and by later flapping fins at the top of its body that closely resemble ears. What’s interesting about these fins are that they change size, shape, and position as the squid matures. After they reach a size of 15-25 mm in length, they begin to develop a pair of fins above the aforementioned pair.
December 1, 2011 Paul Guernsey College Composition Final Conservation of the Bluefin Tuna Bluefin Tuna, or Thunnus thynnus by its Latin name, is one of the largest, fastest swimming, and beautifully colored fish in the entire ocean. Their coloring is made to camouflage themselves from both above and below with metallic blue on top and shimmering silver-white on the bottom. Their bodies are torpedo shaped and built for speed and endurance while hunting for food, or being hunted (National Geographic). bluefin Tuna are prey only to some marine life such as, some whale, shark, and marine mammal species. With highly migratory species like bluefin tuna, management is complicated because these species migrate thousands of miles across oceans and international borders and are fished by many nations.