There is a habit of eating eels on the day of the ox ox, but in fact it is often not known about eels.In fact, there are some parts that have not been elucidated, and ecology.
Therefore, here is a creature called eel, which is surprisingly familiar but is not known!
What is eel?
Eel is a fish classified as eel geniaceae, and is a creature that lives all over the world.
Compatible with the environment from the tropical zone and can actually live in the river, lake and sea.I summarized what kind of fish the eel is.
How many eels are in the world?
It is said that there are 19 types in the world, such as European eels and American Kaigi, and it seems that about four types are used for food.
Some of the named "eels" are named eels, such as Denki -nagi, Fusen eel, and eel.
These are derived from the long and narrow appearance of eels, but are a separate group creature in categorized science.
In Japan, there are two types of Japanese eel and gouregi as a native species.In addition, in recent years, European eels, which have been released, are inhabited although they are outpatient.
The nuts and snails are named "eel", but they are also different classifications.
Unusual ecology
The oscillation of the eel is in its ecology.
There are many facts that have finally been found in recent years, so here are the unknown ecology of eels.
Until now, research was unknown, so the details of the detailed ecology were unknown.
Meanwhile, in recent years, the ecology of eel has gradually been revealed and attracted attention.
Eel is a fish called river -river migration fish, and has the habit of growing in rivers and lakes and descending to the sea to lay eggs.
This is a very rare ecology in the world.That's why more attention is attracting.
In fact, the eel born in the sea seems to have spent several years in freshwater areas such as rivers and lakes, and descends to the sea to determine the spawning place.。
There are quite a few ecology fish that grows in the sea, such as salmon and ayu, and then returns to their hometown and lay eggs, but eel has the unusual ecology of vice versa.
It's not very famous, but in fact, eel is a very good sense of smell and senses the prey with a smell.
The sense of smell is comparable to dogs, and some ingredients have a sense of smell that surpasses dogs!
With that in mind, characters that seem to have just attached two creatures, a seemingly united connection, may have been born as the ultimate sense of smell due to the sense of smell.
The spawning place was a mystery
Originally, the eel was unknown where the spawning place was.It seems that there were few people who saw them on rivers and lakes, but few people saw spawning.
Unlike salmon, etc., it seems that it was difficult to identify the place because spawning in the sea.That has finally been elucidated in recent research.
Among the 19 kinds of eels in the world, about half of the spawning places have been known, and the other seems to have not yet known the detailed spawning place.
It was recently found that the spawning place was found, and a survey has revealed that it hatched off Mariana in 1991.
The spawning was found in 2005 in the west west of the West Mariana Sea Mt. Sluga Sea.
And it was in 2009 that eggs were first collected in the waters for the first time in the waters.In other words, it is recently that it has been known.
From there, it seems to grow in East Asia, riding the Mindanao and Kita -Red Past Sea current, and returns to Japan on the Kuroshio.
Japanese eels have been eaten in Japan for a long time, but it is very recent that various ecology, such as spawning places, has been found!
Completely cultured is difficult
There are many cultivated eels on the market, but they are not completely cultured.In fact, eel is a creature that is very difficult to completely culture.
More than 99 % of edible eels, which are available in Japan, are farmed.However, this is not a complete aquaculture.
The original completely aquaculture must be performed from the hatching of the eggs, but it is said that eel is quite difficult to fully cultivate to lay eggs in the sea.
Then, the mainstream is to buy eel fry, eel, and release it to the aquaculture pond, and ship it large in those farms.increase.
Kinki University is famous in the field of aquaculture research, but it has become a hot topic to fully cultivate bluish tuna.And in 2019, eel was successful.
However, the cost of aquaculture is too high, so the sale of completely aquaculture eels is not yet realistic.
If you sell it, it will be more than 10 times the natural eel.
summary
Eel has a lot of unknown ecology, and in recent years the spawning place has begun to be identified.However, there are still ecology that I do not know, and research is being conducted day and night.
In particular, Japanese eels are currently designated as endangered species, and you may not be able to eat eels as they are.
In order to prevent this from happening, there are expectations for the establishment of eel completely farming!