Analysis of the spawning run of osetr, Acipenser gueldenstaedti, in the Volga River

Veshchev, P.V.; Novikova, A.S.

Voprosy Ichtiologii 26(2): 285-293

1986


ISSN/ISBN: 0042-8752
Accession: 004744311

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Abstract
The analysis of 1,061 individuals in May-Sep. 1977-1982 has shown that 6.24% of Acipenser gueldenstaedti females spawned prior to the flow regulation and 73.3% of male spawners appeared under changed hydrological conditions. The weight loss in spent males and females during the migration and reproduction period averaged 21.4%. The condition factor of males and females remained stable, which is indicative of an adequate food availability in the feeding grounds at sea. Males constituted 63.6% of the spawning stock.