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
Invasive Insects Cost the World Billions Per Year
04.10.2016 | University of Adelaide
Malaysia's unique freshwater mussels in danger
27.09.2016 | The University of Nottingham Malaysia Campus
Physicists from the University of Würzburg have designed a light source that emits photon pairs. Two-photon sources are particularly well suited for tap-proof data encryption. The experiment's key ingredients: a semiconductor crystal and some sticky tape.
So-called monolayers are at the heart of the research activities. These "super materials" (as the prestigious science magazine "Nature" puts it) have been...
Ultrafast lasers have introduced new possibilities in engraving ultrafine structures, and scientists are now also investigating how to use them to etch microstructures into thin glass. There are possible applications in analytics (lab on a chip) and especially in electronics and the consumer sector, where great interest has been shown.
This new method was born of a surprising phenomenon: irradiating glass in a particular way with an ultrafast laser has the effect of making the glass up to a...
Terahertz excitation of selected crystal vibrations leads to an effective magnetic field that drives coherent spin motion
Controlling functional properties by light is one of the grand goals in modern condensed matter physics and materials science. A new study now demonstrates how...
Researchers from the Institute for Quantum Computing (IQC) at the University of Waterloo led the development of a new extensible wiring technique capable of controlling superconducting quantum bits, representing a significant step towards to the realization of a scalable quantum computer.
"The quantum socket is a wiring method that uses three-dimensional wires based on spring-loaded pins to address individual qubits," said Jeremy Béjanin, a PhD...
In a paper in Scientific Reports, a research team at Worcester Polytechnic Institute describes a novel light-activated phenomenon that could become the basis for applications as diverse as microscopic robotic grippers and more efficient solar cells.
A research team at Worcester Polytechnic Institute (WPI) has developed a revolutionary, light-activated semiconductor nanocomposite material that can be used...
14.10.2016 | Event News
14.10.2016 | Event News
12.10.2016 | Event News
28.10.2016 | Power and Electrical Engineering
28.10.2016 | Physics and Astronomy
28.10.2016 | Life Sciences