What kind of food does jellyfish eat

Jellyfish is the general name of the jellyfish genus of the jellyfish family jellyfish. It floats in the ocean, the adult umbrella bulges in a hemispherical shape, the surface of the body umbrella is smooth and the glue layer is thick, and it is widely distributed along the coast of Zhejiang and Fujian. Groups of jellyfish haunt the sea from August to September every year, which can be cultivated artificially. Let's take a look at what jellyfish eat.

What kind of food does jellyfish eat

The jellyfish does not feed at the floating wave larva stage and does not begin to feed until the metamorphosis is a 4-tentacle polyp larva, which is a predatory organ that feeds on small zooplankton. The discoid larva has a square mouth and feeds on small plankton. With the growth and development of mouth and wrist formation, about 20 mm umbrella diameter, the central mouth closed, for young stings. From the young sting to the adult stage, the small zooplankton is fed by many suctions on the mouth, wrist and shoulder plate, and there are many kinds of bait. mainly copepod, cladocera, ostracod, amphipod, ciliates, shellfish larvae and other zooplankton larvae.

Can jellyfish sting people to death?

Jellyfish can sting to death. The thin and tender part of the human skin is the most prone to stinging. Generally, the electric shock-like tingling sensation can occur in a few minutes, and the electric shock-like tingling sensation gradually appears in the injured area after a few hours. After a few hours, the injured area gradually appears a blood rash with erythema arranged in line, itching and burning pain. The mild one can heal itself in about 20 days. Patients with strong sensitivity may have erythema edema, wind masses, blisters, ecchymosis, and even epidermal necrosis. The patient's whole body performance may have restlessness, chills, abdominal pain, diarrhea, low spirits and chest tightness and shortness of breath. Severe cases often have cough and asthma attacks, spitting white or pink foamed sputum, accompanied by signs of anaphylactic shock, such as weakness of pulse, cyanosis of skin and decrease of blood pressure. If the rescue is not timely, patients with this kind of sting can die in a short period of time.

Species classification of jellyfish

1. Macular jellyfish: macular jellyfish is very similar to jellyfish, the main difference is that there are many short and sharp warts on the surface of the outer umbrella, and there are yellow-brown spots on the surface of the outer umbrella. The rod-shaped appendages on the mouth and wrist are short and small, and the ends of the appendages are spherical or rod-shaped. The reproductive process is large and oval, with spiky protuberances on the basal surface. The adults are milky white, and there are many small yellow spots scattered on the surface of the umbrella. This is a tropical species, mostly distributed in Fujian, Guangdong and other southern coastal areas.

2. Rod-shaped jellyfish: the rod-shaped jellyfish is smaller, with an umbrella diameter of 40mm and a height of 50mm. The outer umbrella is very smooth and thin. There are 14 to 16 slightly round and flattened marginal valves at the edge of each umbrella. There is no reproductive process, and the shoulder plate is very small. The vertical tube is very short, the mouth and wrist is about 35 mm long, the base is 3 mm, the wrist disc is 12 mm in diameter, the rod-shaped appendages inserted in the mouth and wrist are rare, and the end rod-shaped appendages are about 10 mm long. Filamentous appendages are underdeveloped, only born on the shoulder plate. The annular canal is underdeveloped, the reticular system of the inner ring is wide and obvious, the inner outline is roughly parallel to the gastric cavity, and the sensory canal is branched or reticulated. It is only distributed in the sea area of Xiamen in China.

3. Sand jellyfish: sand jellyfish is a large jellyfish with an umbrella diameter of 180mm to 980mm, showing a hemispherical shape, and the surface of the umbrella is covered with fine particles. The number of marginal lobes varies greatly, and there are usually 14 margin of umbrella in 1pm 8. 8 sensory organs. There are 16 radial ducts, and the terminal branches are connected to each other into a network. The inner umbrella has well-developed circular muscles. The mouth and wrist are 8, the base is healed, the free end is extended outward, the end is bifurcated, the lateral branches are long, and the mouth and wrist are attached with many filamentous appendages. Four separate reproductive acupoints without reproductive papillae. When living, the umbrella is brown and the appendages are dark brown. It is a cold water species, which is mainly distributed in the south of the Yellow Sea and the north of the East China Sea in China.

4. Square jellyfish: square jellyfish, also known as box jellyfish, sea wasps, etc., mainly live in the northern coastal waters of Australia and New Guinea, the Philippines and Vietnam, because of their slightly round shape, like a square needle named. Poisonous, if a person touches its tentacles, he will soon die. It is considered to be the deadliest jellyfish.