By Ramón Carmona, Alberto Domezain, Manuel García Gallego, José Antonio Hernando, Fernando Rodríguez, Manuel Ruiz-Rejón
Sturgeons are thought of “living fossils”, sharing many morphological and organic beneficial properties with ancestral fish. in addition, sturgeons are of the maximum curiosity from an fiscal viewpoint, not just for the caviar yet for the flesh. besides the fact that, the wild populations of the vast majority of the species are at severe threat of extinction worldwide. So, it truly is pressing to boost techniques for either farming tradition and conservation and restoration in normal habitats.
This booklet presents a entire view of the biology and sustainable improvement of sturgeons placing emphasis at the Southern Europe autochthonous species similar to Acipenser nacarii and Acipenser sturio that proportion geographical distribution. different correct species (such as Huso huso, A. oxyrhinchus, A. ruthenus, A. stellatus) and parts (Germany, Russia, North the US) also are thought of. The contents are organised in 3 sections: Taxonomy and Biogeography (including the morphological and genetic analyses that make clear the taxonomy and phylogeny of sturgeons, fascinated with these from Southern Europe), Biology and Aquaculture (where numerous facets of the developmental biology, feeding, and replica are thought of with regards to the advance of sturgeon farming), and restoration and Conservation (that collates and analyses assorted restoration learn activities, the ecology of the rivers for recovery in addition to the issues on the topic of the alternate of caviar).
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Extra info for Biology, Conservation and Sustainable Development of Sturgeons
Sturio, A. naccarii and A. oxyrinchus Manuel A. Garrido-Ramos, Francisca Robles, Roberto de la Herrán, Esther Martínez-Espín, José A. Lorente, Carmelo Ruiz-Rejón, and Manuel Ruiz-Rejón Abstract Today, with all the sturgeon species almost disappearing all over the world, it is necessary to undertake their recovery under the programs for the conservation of genetic resources. The complete absence of these fish from most rivers increases the difficulties in carrying out such programs, hampering the genetic identification of specimens and their correct species assignment.
Naccarii has had a broader distribution area than the Adriatic Sea, extending throughout the Western Mediterranean, and even reaching the waters of the Iberian Peninsula. Using forensic techniques, we have isolated authentic DNA from several museum sturgeon specimens (Fig. 5). Seven of these specimens were caught in the Iberian Peninsula (six from the Guadalquivir and one from the Ebro) all of them catalogued as A. sturio. Six specimens were from Italian museums, of which two specimens from the Adriatic coast were catalogued as A.
In this sense, the robustness of mitochondrial DNA as a phylogenetic marker has proved successful in shedding light in several studies on the evolutionary pathways leading to current extant sturgeon species. However, the use of mitochondrial sequences can be problematic when specimens are F1 hybrid (maternal mitochondria and maternal/paternal nucleus) or the result of a process of genetic introgression (maternal mitochondria and paternal nucleus). , 2003). The development of newer and more powerful nuclear markers is necessary for both evolutionary and taxonomic genetic analysis in sturgeons.