|
Implantation
The sturgeons belong to the most primitive group of osseous fish and one does not count less than 26 species in Asia, Russia and North America. In France, nowadays, the Sturgeon is more present only in the Garonne-Dordogne mining area. Its migration of reproduction currently stops on the level of on the Garonne and Bergerac on the Dordogne. Apart from the period of abrasion, the sturgeon is present close to the coasts, in shallow water of certain estuaries.
Lifestyle
The Sturgeon nourishes shellfish and of worms while excavating in the vases, and with the age, its fuel supply with fish supplements that them Lançons.
If the male are mature between 7 and 9 years, the females are it more tardily, between 8 and 14 years. For the ones like the others, they will measure approximately 1, then. After being itself approximate coasts, the sturgeons seek to go up the rivers between April and June to clear.
|
|
Scientific name:
Family:
Other names:
Maximum weight: 170
Maximum size: up to 3,eters
Lifespan: 60 to 100 years
Period of abrasion: May at July
Bridge: 86000 per kg of the female
The body of the sturgeon is lengthened. It is covered with 5 longitudinal lines of osseous plates (), the skeleton is only partially ossified. The back is gray-ashy with gray-brown with green reflections, the belly is yellowish with silver plated reflections. The muzzle is pointed, the mouth is presented in the form of a protractile tube, it is preceded by 4 .
Certain works mention specimen of more than 6 to eters for more than g which could be a few 100 years old of age. But nowadays, the beautiful subjects do not exceed the eters.
|
|
Some will reach that point, by making tens of , without meeting obstacles, others will remain not far from the mouth. The females will seek gravel funds located at depths from 2 to eters.
While the adults turn over at sea, the youthful ones will wait between 1 and 3 years before going down again towards the estuaries and the sea. the sea-bream leaves the coasts to gain the open sea. The female can lay to 206 011 ovules per kilo of its weight. The sea-bream lays its egg in a “nest” dug by the male and which will also take care of the guard.
Fish
Very threatened species, the fisheries and the sale are prohibited in France by the interministerial decree of January 25th, 1982.
|
