Japanese people eat eel in the summer, but eel is so expensive that ordinary people cannot buy it. The reason why eel prices are high is because natural glass eels cannot be harvested and eel farming has not been established.
The larvae of eels and conger eels are called leptocephalus. In the case of eels, they are approximately 1 to 6 cm in size and look like transparent leaves. In aquaculture, most of the animals die at the leptocephalus stage.
夏になると日本人はウナギを食べますが、ウナギは値段が高くて庶民は買えません。ウナギの値段が高いのは天然のシラスウナギが取れないことと、ウナギの養殖が確立されていないからです。
ウナギやアナゴの幼生をレプトセファルスと呼びます。ウナギの場合では、大きさはだいたい1～6cmほどで、見た目は透明な木の葉のような形をしています。養殖ではレプトセファルスの段階でほとんど死んでしまいます。
The Western Mariana Sea, where Japanese eels spawn, is said to be 3,000 to 4,000 meters deep. The young Japanese eel, Leptocephalus, hatches from eggs here and travels to waters near the northeastern part of the Philippines, riding the North Equatorial Current, which flows westward just north of the equator. This time, riding the current of the Kuroshio Current, it will be washed away to East Asia and headed for Japan. At this time, Leptocephalus floats along with the ocean currents and grows by eating marine snow (carcasses of plant and animal plankton).
ニホンウナギが産卵する西マリアナ海溝の深さは3,000－4,000mです。ここで卵からふ化したニホンウナギの子レプトセファルスは、赤道のすぐ北側を西に向かって流れる北赤道海流に乗り、フィリピンの海域に移動します。今度は黒潮の流れ乗り、東アジアへ流され日本にむかいます。この時レプトセファルスはふわふわと海流に身を任せて漂いながら、マリンスノー（動植物プランクトンの死骸）を食べて成長していきます。
By the time it approaches Japan, it metamorphoses into a glass eel. When they approach Japan’s coast, they select a suitable river to go upstream and begin their journey upstream. Eels are carried over wide areas by ocean currents due to their long leptocephalus period and flattened bodies. Leptocephalus is also transparent and inconspicuous, giving it an advantage in being seen by predators.
日本に近づく頃にはシラスウナギに変態します。日本の沿岸域に近づくと、遡るのに適した河川を選び、遡上を開始します。ウナギはレプトセファルス期間が長いことと、体が扁平であることで海流によって広い範囲に運ばれます。またレプトセファルスは透明で目だたないため、捕食者にみつかりに利点があります。
I look forward to the day when eel farming is established and we can eat it cheaply as fast food.
早く完全養殖が確立されファーストフードで食べれる日を待ち望んでいます。
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