What is the special meaning and significance of jellyfish?
Jellyfish is a kind of lower invertebrate zooplankton and carnivore, which belongs to Acanthoptera and Cephalopoda in taxonomy, with about 250 known species. The term jellyfish also refers to jellyfish-shaped (bell-shaped or dish-shaped) stinging animals, such as hydra jellyfish, tube jellyfish, Deming jellyfish (including capuchin jellyfish), comb jellyfish and sea urchin, which do not belong to the class of algae-eating.
Extended data jellyfish appeared earlier than dinosaurs, dating back to 650 million years ago. There are many kinds of jellyfish with different shapes, ranging in diameter from 10 cm to 100 cm, which are common in the oceans all over the world. The vast majority of marine products, only a few species are produced in fresh water, and the shallow waters of tropical and subtropical oceans are the most abundant.
Smaller species can be used as bait; Jellyfish become food after pickling, and some kinds can be used as medicine; Some floating jellyfish can be used as indicators of current; However, some large jellyfish (such as jellyfish and Rhizopus) will block or destroy fishing nets when they appear in large numbers. Few species live in fresh water, but most species live in the ocean, most live in shallow water, and a few are deep-sea species.
Jellyfish is a kind of cellular animal, with simple structure and no muscles and bones. Its body is 98% water, but some jellyfish can emit light. For example, a jellyfish (Ctenopharyngodon medusa) swims in the sea, and its body shows a spherical blue light, and several long tentacles behind it flash with slender light bands. With the bending and swinging of the body when swimming, the light is also very beautiful and moving.
It turns out that the light source of jellyfish is different from other animals. Most other animals emit light by catalyzing oxygen with fluorescein and luciferase.
However, jellyfish glow by a magical protein called Hawk Hook Line. This protein can emit strong blue light when it meets calcium ions. According to scientists' research, each jellyfish contains about 50 micrograms of jellyfish luminescent protein, which shows that jellyfish rely on it to emit light. For studying the luminous principle of jellyfish, Shimomura and others won the 2008 Nobel Prize in chemistry.
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