1, freshwater eel is a descending river migratory fish, native to the sea, anadromous to the freshwater to grow up, and then return to the sea to spawn. Every spring, a large number of young eels (also known as white children, eel line) from the sea into the mouth of the river in groups.
2. The eel spawns and breeds in the deep sea and grows up in a freshwater environment. Fierce temperament, voracious, active, day and night, tend to spin light strong, like running water, good warm.
3, eel fry can not be cultivated by artificial propagation, this is mainly because the eel has a very special life history, it is difficult to simulate in an artificial environment. The Japanese eel grows into an adult eel in a freshwater river, and in the summer it begins to migrate down to the sea, that is, from the river to the ocean to spawn, and trout and salmon from the ocean back to the river to spawn anadromous migrations are just the opposite of the anadromous migrations.
4, the eel's young body length of about 6 centimeters long, weighing 0.1 grams, but its head is narrow, the body is high, thin and transparent like a leaf, so it is known as "willow leaf fish". Its body fluid is almost the same as that of seawater, so it can be drifted along with the ocean current for long distances with little effort.
5. It takes about half a year to drift from the spawning grounds back to the Kuroshio Current and then back to the coast of Taiwan, and only a month before it reaches the shore does it begin to metamorphose into the slender, transparent eel threads that are also known as the "glass fish". Therefore, from December to January every year, fishermen will be busy catching eel threads that are about to go back to the river by using hand nets along the coast near the estuary and sell them to breeders.
Expanded InformationLife Habits of the Freshwater Eel
The eel is a diadromous migratory fish that originates from the sea and grows up in freshwater, then returns to the sea to spawn. In the spring of every year, a large number of young eels enter the river mouth from the sea in groups. The male eel usually grows up in the mouth of the river; while the female eel goes upstream into the dry and tributaries of the river and the lakes connected to the river, and some even travel thousands of kilometers to reach the upper reaches of the river body of water.
The eel is a general term for species belonging to the order Anguilla, also known as the eel. Also known as eel, it is a fish that looks like a long snake and has the basic characteristics of a fish. In addition, eels have migratory characteristics similar to salmon.
When processing eel, it should be noted that its serum is poisonous. Although the toxin can be destroyed by heating or gastric juice, drinking raw eel blood can sometimes cause poisoning. Its role is mainly to poison the nervous system, producing spasms, heart weakness, resulting in respiratory arrest and death; also can make the blood coagulation disappear and produce hemolytic phenomenon, damage to the kidneys to produce hematuria.
Three, freshwater eel's medical effects
Eel's meat, bone, blood, swim bladder, etc. can be used as medicine. The meat is sweet, flat, nourishing and strong, the effect of the wind to kill insects. It can be used in the treatment of pulmonary tuberculosis caused by prolonged weakness, tuberculosis fever, leucorrhea, rheumatism, bone pain, body weakness and other diseases. According to Li Shizhen, "the eel is the main disease, its function is specialized in killing insects to wind".
Four, basic information
Adapted to different salinity of the freshwater eel: freshwater eels are often born to face a period of the worst water career. After being born in the brackish waters of the Sargasso Sea near the West Indies in the North Atlantic, they will swim to some freshwater rivers in the United Kingdom and the east coast of North America. During this migration, their kidneys adapt to the varying salinity of the water.
V. Species
There are 18 species of eels in the world, including four families in Taiwan: the Japanese eel, the perch eel, the Celebes eel and the short-finned eel. They have all survived on earth for tens of millions of years, but our understanding of them is only in recent decades. The sex of eels is controlled by environmental factors and density, and when the density is high and there is not enough food, they will become males, and vice versa, they will become females. In Taiwan's rivers, eels are mostly females because of their low abundance.
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