In Bordeaux, researchers were rushing to build up stocks of parent fish and set up artificial reproduction methods in an attempt to produce sturgeon fry. This objective was met on 25 june 2007 at the Cemagref fish station in St-Seurin-sur-l’Isle, in the Gironde area.
Sturgeon fry under close surveillance
The parent's are part of the sturgeon stock created from young fish born in the mid 1990s and kept in captivity since that time. After more than 10 years of daily care and effort on the part of the research team, a female (Francine, born in 1994 and weighing 8.5 kg) and two males (Justin, born in 1984, 24 kg, and Emile, born in 1994, 17.6 kg) provided slightly more than 11,000 larvae.
Depending on how successful these early-stage fish are, very fragile until they begin taking on food, and limited by the mother's weight and young age, this first reproduction should provide a few thousand fry.
Part of these fish are expected to reinforce the two stocks in captivity as part of the species’ preservation and restoration programme in Europe: one in France (the Cemagref fish station at St-Seurin-sur-l’Isle) and the other in Germany (the Freshwater Institute of Berlin). Depending on the success rearing these fry, the remainder should be released into the wild in the Garonne and Dordogne rivers, undoubtedly at the beginning of September, to sustain the wild population whose numbers are currently at their lowest.Towards other artificial reproduction to stimulate reimplantation of the species
The sturgeon in captive stocks, progressively built up since the mid-1990s, are now approaching sexual maturity. This first success in artificial reproduction of the European sea sturgeon, from fish reared in captivity, demonstrates the soundness of this solution. It compensates the absence of any natural reproduction since 1994, given the rarity of parent fish returning to the rivers for reproduction. There is now reasonable hope that the coming years will see the release of sufficiently abundant numbers to boost this last world population of the species.Partners united in a single objective: restore and protect the species
Work is currently coordinated by the WWF France within a consortium grouping (in addition to the scientific organazations) public institutions of the EPIDOR basins (the Dordogne river basin), SMEAG (the Garonne river basin) and SMIDDEST (the Gironde estuary) and the CNPMEM (National Committee for Marine Fishery and Marine Fish Rearing).
Efforts have been made to raise awareness to this situation, aiming notably at preserving the habitats used by this species and at limiting accidental capture,conditions indispenable to the restoration of the population. This work has finally benefitted from the involvement of professional and institutional organazations of the maritime and continental fisheries sector, environmental protection groups, and specific groups working towards preserving sturgeons.Maximum level of protection for the European sea sturgeon
Marie Signoret | alfa
Litter is present throughout the world’s oceans: 1,220 species affected
27.03.2017 | Alfred-Wegener-Institut, Helmholtz-Zentrum für Polar- und Meeresforschung
International network connects experimental research in European waters
21.03.2017 | Leibniz-Institut für Gewässerökologie und Binnenfischerei (IGB)
The Institute of Semiconductor Technology and the Institute of Physical and Theoretical Chemistry, both members of the Laboratory for Emerging Nanometrology (LENA), at Technische Universität Braunschweig are partners in a new European research project entitled ChipScope, which aims to develop a completely new and extremely small optical microscope capable of observing the interior of living cells in real time. A consortium of 7 partners from 5 countries will tackle this issue with very ambitious objectives during a four-year research program.
To demonstrate the usefulness of this new scientific tool, at the end of the project the developed chip-sized microscope will be used to observe in real-time...
Astronomers from Bonn and Tautenburg in Thuringia (Germany) used the 100-m radio telescope at Effelsberg to observe several galaxy clusters. At the edges of these large accumulations of dark matter, stellar systems (galaxies), hot gas, and charged particles, they found magnetic fields that are exceptionally ordered over distances of many million light years. This makes them the most extended magnetic fields in the universe known so far.
The results will be published on March 22 in the journal „Astronomy & Astrophysics“.
Galaxy clusters are the largest gravitationally bound structures in the universe. With a typical extent of about 10 million light years, i.e. 100 times the...
Researchers at the Goethe University Frankfurt, together with partners from the University of Tübingen in Germany and Queen Mary University as well as Francis Crick Institute from London (UK) have developed a novel technology to decipher the secret ubiquitin code.
Ubiquitin is a small protein that can be linked to other cellular proteins, thereby controlling and modulating their functions. The attachment occurs in many...
In the eternal search for next generation high-efficiency solar cells and LEDs, scientists at Los Alamos National Laboratory and their partners are creating...
Silicon nanosheets are thin, two-dimensional layers with exceptional optoelectronic properties very similar to those of graphene. Albeit, the nanosheets are less stable. Now researchers at the Technical University of Munich (TUM) have, for the first time ever, produced a composite material combining silicon nanosheets and a polymer that is both UV-resistant and easy to process. This brings the scientists a significant step closer to industrial applications like flexible displays and photosensors.
Silicon nanosheets are thin, two-dimensional layers with exceptional optoelectronic properties very similar to those of graphene. Albeit, the nanosheets are...
20.03.2017 | Event News
14.03.2017 | Event News
07.03.2017 | Event News
29.03.2017 | Materials Sciences
29.03.2017 | Physics and Astronomy
29.03.2017 | Earth Sciences