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
Safeguarding sustainability through forest certification mapping
27.06.2017 | International Institute for Applied Systems Analysis (IIASA)
Dune ecosystem modelling
26.06.2017 | Albert-Ludwigs-Universität Freiburg im Breisgau
Physicists working with researcher Oriol Romero-Isart devised a new simple scheme to theoretically generate arbitrarily short and focused electromagnetic fields. This new tool could be used for precise sensing and in microscopy.
Microwaves, heat radiation, light and X-radiation are examples for electromagnetic waves. Many applications require to focus the electromagnetic fields to...
Strong light-matter coupling in these semiconducting tubes may hold the key to electrically pumped lasers
Light-matter quasi-particles can be generated electrically in semiconducting carbon nanotubes. Material scientists and physicists from Heidelberg University...
Fraunhofer IPA has developed a proximity sensor made from silicone and carbon nanotubes (CNT) which detects objects and determines their position. The materials and printing process used mean that the sensor is extremely flexible, economical and can be used for large surfaces. Industry and research partners can use and further develop this innovation straight away.
At first glance, the proximity sensor appears to be nothing special: a thin, elastic layer of silicone onto which black square surfaces are printed, but these...
3-D shape acquisition using water displacement as the shape sensor for the reconstruction of complex objects
A global team of computer scientists and engineers have developed an innovative technique that more completely reconstructs challenging 3D objects. An ancient...
Physicists have developed a new technique that uses electrical voltages to control the electron spin on a chip. The newly-developed method provides protection from spin decay, meaning that the contained information can be maintained and transmitted over comparatively large distances, as has been demonstrated by a team from the University of Basel’s Department of Physics and the Swiss Nanoscience Institute. The results have been published in Physical Review X.
For several years, researchers have been trying to use the spin of an electron to store and transmit information. The spin of each electron is always coupled...
26.07.2017 | Event News
21.07.2017 | Event News
19.07.2017 | Event News
27.07.2017 | Life Sciences
27.07.2017 | Life Sciences
27.07.2017 | Health and Medicine