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For the first time in history, scientists have observed a spontaneously matured female European eel. She was caught in and has since lived in the Finnish aquarium house Maretarium in Kotka. The gained insights will contribute to the closing of the production cycle of eels in aquaculture.
The information is also very important for conservation of the natural population. At the end of their life, European eels migrate from the European freshwaters to the Sargasso Sea to reproduce.
When they leave the continent, they are 5 to 50 years old but still pre-pubers. After a 5 to 6, km swim trip, they reproduce and die afterwards. Two day old larvae have been caught in the Sargasso, to date still the most convincing evidence that reproduction should be occurring there.
Naturally matured eels have never been caught, in the Sargasso Sea or elsewhere. In captivity only by long-term hormonal treatment eels can be matured artificially. She was part of a batch of twelve eels that was re-caught again in and which was then transferred to the Finnish Maretarium in Kotka.