What is the information about the creatures under the sea?

Underwater animals include: sharks, whales.

Dolphins, jellyfish, manatees, etc., their characteristics are as follows:

1. Sharks. Sharks have hard, muscular bodies that are spindle-shaped to varying degrees. The muzzle and nose parts vary depending on the species, from pointed to large and rounded. The tail (caudal fin) that rises vertically upwards is roughly crescent-shaped, and the upper part of the caudal fin is much larger than the lower part in most species.

2. Whales. Whales are large, some with large bodies, and the largest can reach a length of up to 30 meters. The whale is shaped like a fish and is in the shape of a shuttle.

The head is large, the eyes are small, and the ear shells are completely degenerated. The neck is not noticeable. The forelimbs are fin-shaped, and the hindlimbs are completely vestigial; Most species have fins on their dorsal backs; The tail is horizontally finned and is the main locomotor organ.

3. Dolphins. The dolphin is meters long and weighs 23,225 kilograms. Dolphins generally have a pointed mouth and upper and lower jaws.

Each has about 100 thin teeth, mainly small fish and squid.

Shrimp and crabs are fed.

4. Jellyfish. Jellyfish do not have a spine, but they have a very large body, relying mainly on the buoyancy of the water to support their huge body. The body shape is like a transparent umbrella, and the diameter of the umbrella body can be large and small, and the diameter of the umbrella body of the large jellyfish can reach 2 meters.

5. Manatee. Due to their adaptation to life in the water, manatees specialize in cones on their forelimbs, but they still have vestigial hooves at the ends, which are closer to ungulates. The hind limbs gradually degenerate and disappear, and the tail is a round broadwhale.

1. Blue whaleIt is a marine mammal of the baleen whale family and the genus Baleen Whales. There are 4 subspecies. The blue whale is believed to be the largest animal known to have ever survived on Earth, reaching up to 33 meters long and weighing up to 181 tons.

The blue whale has a slender body and a blue-gray back, although it can sometimes be lighter in the water.

2. Killer whalesIt is the largest species in the mammalian and dolphin families. It is found in almost all ocean areas, from the equator to the polar waters. There is no limit to its range by water temperature or depth.

The distribution extends to many closed or semi-enclosed seas, such as the Mediterranean, the Sea of Okhotsk, the Gulf of California, the Gulf of Mexico, the Red Sea, and the Persian Gulf.

3. Weasel shark, often near estuaries and harbor activities; Nocturnal, feeding at night to shallow water and daytime to deep water. Ferocious and greedy, it preys on bony fish, other sharks, stingrays, marine mammals, turtles, seabirds, etc. It is widely distributed in the world's oceans between north and south latitudes of 40°.

In China, it is distributed in the Yellow Sea, the East China Sea, the northeast and southwest seas of Taiwan, and the South China Sea.

4. Hexigill sharkIt is a species of shark of the phylum Vertebrates, Subphylum Vertebrates, Cartilaginous Fishes, Subclass Plategils, Hexagill Sharks, Hexagillidae, and Hexagills. It was found at a depth of 1,400 meters in the Coral Sea of Australia.

5. Atlantic bluefin tunaIt is an oceanic pelagic migratory fish. It can withstand a considerable range of temperatures, living both above and below the thermocline at depths of more than 9,850 meters. Tie the knot and swim fast.

When juvenile, Atlantic bluefin tuna exhibit a strong social swimming habit.

The above content reference: Encyclopedia - Atlantic bluefin tuna.

The above content reference: Encyclopedia - Hexagill Shark.

The above content reference: Encyclopedia - Weasel Shark.

The above content reference: Encyclopedia - Killer Whales.

The above content reference: Encyclopedia - Blue Whale.

Cetaceans, dolphins, seals, sea lions, dugongs, horseshoe crabs, shrimps, crabs, turtles, mussels, pearl oysters, scallops, oysters, clams, squid, octopuses, turtles, sea otters, sponges, anemones, etc. A total of 20,278 species of marine life have been recorded in the waters under China's jurisdiction. These sea creatures belong to 5 kingdoms and 44 phyla.

Among them, the animal kingdom has the largest number of species (12,794 species) and the prokaryotic kingdom has the least (229 species).

Cetaceans, dolphins, seals, sea lions, dugongs, horseshoe crabs, shrimps, crabs, turtles, mussels, pearl oysters, scallops, oysters, clams, squid, octopuses, turtles, sea otters, sponges, anemones, etc. A total of 20,278 species of marine life have been recorded in the waters under China's jurisdiction. These sea creatures belong to 5 kingdoms and 44 phyla.

Among them, the animal kingdom has the largest number of species (12,794 species) and the prokaryotic kingdom has the least (229 species). The species of marine organisms in China account for about 10 of the total number of marine species in the world.