Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 561907
Title First Observation of a Spontaneously Matured Female European Eel (Anguilla anguilla)
Author(s) Palstra, A.P.; Jéhannet, P.; Swinkels, W.; Heinsbroek, L.T.N.; Lokman, P.M.; Vesala, S.; Tulonen, J.; Lakka, T.; Saukkonen, S.
Source Scientific Reports 10 (2020)1. - ISSN 2045-2322
DOI https://doi.org/10.1038/s41598-020-59331-6
Department(s) Animal Breeding & Genomics
WIAS
Animal Breeding and Genomics
Publication type Refereed Article in a scientific journal
Publication year 2020
Abstract

This study reports on the first observation of a spontaneously matured female European eel. The 43-year-old eel, together with eleven other females, resided at an aquarium house since their capture in 2002 and stocking as glass eels in 1978. In June 2019, the girth of the belly of the female increased as a sign of oocyte maturation. The specimen had an estimated gonadosomatic index (GSI) of 47, only half of the oocytes were hydrated and matured, indicating that European eels are polycyclic batch spawners. The live eels of the cohort were still in the previtellogenic phase but their eye sizes were close to that of the matured eel. We hypothesize that substances released by other maturing and spawning fishes may have triggered puberty of the eel. This first observation, and the possibility of more eels maturing in the near future, provides a natural reference for the sexual maturation of the European eel.

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