elver

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elver

a young eel, esp one migrating up a river from the sea
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Growth and mortality of European glass eel Anguilla anguilla marked with oxytetracycline and alizarin red.
b) The unprecedented exploitation of glass eel stocks in European waters was evident during the last 15 years, in order to fulfill the demand by Chinese farms; it resulted in sky-high prices glass eels (>1000 [euro]/kg) and dramatic decrease of natural stocks in European inland waters (ICES, 2008).
It spawns in the Sargasso Sea and the young willow leaf-shaped leptocephalus larva disperses over great distances before it metamorphoses into a transparent glass eel.
Our quarry this snowy March morning was glass eels.
Meanwhile, 4-inch glass eels, a juvenile life stage, have been found and fished in coastal streams in America and Europe for millennia, but it's just as much of a conundrum how they get there.
They return to sea in summer when the rivers are flowing, which is also when the new generation of glass eels arrive, change into elvers and migrate upstream.
These eels, known as "elvers" or glass eels due to their translucent appearance and small size at the juvenile stage in their life cycle, are reared to adult size for the food fish market.
When they finally arrive at our river mouths, they're transparent and called glass eels or elvers.
As they near the coast they change into little transparent eels called glass eels or elvers.
As unpigmented glass eels or newly pigmented elvers, they enter UK estuaries with the spring tides in April and May migrating upstream into freshwater where they stay and mature for up to 20 years,.
The new-born eels, known as glass eels because of their almost transparent bodies while they are in the sea, are carried by the Gulf Stream and reach Europe's river systems where they are now called elvers.
Trawling (fine-meshed trawls) was stopped, glass eels have been regularly introduced into the lake since 1956, and the protection of commercial fishes has been improved.