51813_Sturgeon biodioversity an.PDF

Vutskits, G. 1913. Classis Pisces. Fauna Regni Hungariae. 1. Ver- tebrata Regia Soc. Sci. Natur. Hungarica. Budapest. 42 pp. Wei ...

Environment Biology of Fishes 48:201-207, 1997. ©1997Kluwer Academic Publishers. Printed in the Netherlands. Endangered migrator ...

Figure 1.Mapof the lower and portions of the middle Danube River and some major tributaries to show features related to sturgeon ...

caught here. You would not believe it if you have not seen it with your own eyes’ (Giurescu 1964). In 1652, the traveler Robert ...

About 300 reservoirs in the Danube Basin were threaten to further alter the flow of the lower Da- formed by damming. These lakes ...

from the Vienna basin to the Ural Mountains. In the Pliocene, the Samnatic Sea was reduced to the smaller Pontic Sea, which incl ...

1930s, the macrozoobenthic fauna near the Crimea decreased from 38 to 11 species, and their density diminished from 245 to 99 in ...

and improved by Vadim Birstein and William E. nyi. 1994.MnemiopsismccradyiMayer, 1900 is a new inhabit- ant of the Black Sea. Gi ...

Sturgeons from the Danube river (Black Sea) collection at the ‘Grigore Antipa’ Natural History Museum, Bucharest: a – Acipenser ...

EnvironmentalBiologyofFishes48:209–219,1997. © 1997KluwerAcademicPublishers. Printed in the Netherlands. Present status of comme ...

Figure1.Map showing lower portions of the Volga and Ural rivers, northern part of the Caspian Sea, and adjacent regions referred ...

Population changes and status Beluga Historically, beluga were harvested more intensive- ly than were Russian and stellate sturg ...

Figure 4. Estimated numbers of sturgeons in the Northern Caspian Sea from the Volga and Ural river populations. river than they ...

number of stellate sturgeon harvested varies from 194 000 in 1967 to 884 000 in 1986. From 85 000 to 388 000 individuals (20–44% ...

The number of spawning fish in the Ural River is critical for the survival of this population. Factors affecting sturgeon stocks ...

spawning beluga or stellate sturgeon, that later en- tered the river. The number of Russian sturgeon juveniles re- leased from s ...

cle atrophy. The most common oil products, diesel fuel, and hexachlorocyclohexane, are known to cause anomalies in muscles of ju ...

(5) Since 1990, declines in sturgeon populations have occurred due to poaching and overfishing in the Volga River and Caspian Se ...

ical Status of the Volga River-Caspian Sea Acipenserids in Normal Individuals and in the Individuals with Muscle Degen- eration ...

genesis in Caspian sturgeons. Voprosy Ikhtiologii 32:176–180 (in Russian, English translation J. Ichthyol. 33: 127–133). Romanov ...