Present State and Perspectives of Stellate Sturgeon Brood Fish in the Romanian Part of the Danube
Identifieur interne : 000289 ( Istex/Curation ); précédent : 000288; suivant : 000290Present State and Perspectives of Stellate Sturgeon Brood Fish in the Romanian Part of the Danube
Auteurs : Cornel Ceapa [Roumanie] ; Patrick Williot [France] ; Nicolae Bacalbasa-Dobrovici [Roumanie]Source :
- International Review of Hydrobiology [ 1434-2944 ] ; 2002-11.
English descriptors
Abstract
This paper is presenting the results of a four years biometry study on the stellate sturgeon (Acipenser stellatus) brood fish in the Danube River. We calculated the growth rate, the length‐weight relationships and the age composition for the two sexes of the brood fish during the reproduction migration. Comparing with the age frequencies for the 1965–1968 period we noticed an appreciable shift in the proportion of the age classes toward the youngest ones and a rejuvenation of the population (average age of 7.2 years for the males and 10.9 years for the females). The average total length for the 1997–2000 period (mean TL = 119,73 cm) is much smaller compared to the 30 years earlier value (mean TL = 131.16 cm). The maximum frequency age class was the 7th years class for the males and the 8th and 11th for the females. These data are a classical expression of overfishing.
Url:
DOI: 10.1002/1522-2632(200211)87:5/6<507::AID-IROH507>3.0.CO;2-W
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ISTEX:85759EF4C89F15AAC92C1E346C6D9CDCF2198FAALe document en format XML
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<front><div type="abstract" xml:lang="en">This paper is presenting the results of a four years biometry study on the stellate sturgeon (Acipenser stellatus) brood fish in the Danube River. We calculated the growth rate, the length‐weight relationships and the age composition for the two sexes of the brood fish during the reproduction migration. Comparing with the age frequencies for the 1965–1968 period we noticed an appreciable shift in the proportion of the age classes toward the youngest ones and a rejuvenation of the population (average age of 7.2 years for the males and 10.9 years for the females). The average total length for the 1997–2000 period (mean TL = 119,73 cm) is much smaller compared to the 30 years earlier value (mean TL = 131.16 cm). The maximum frequency age class was the 7th years class for the males and the 8th and 11th for the females. These data are a classical expression of overfishing.</div>
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