Restoration of sturgeons: lessons from the Caspian Sea Sturgeon Ranching Programme
Identifieur interne : 000C71 ( Istex/Checkpoint ); précédent : 000C70; suivant : 000C72Restoration of sturgeons: lessons from the Caspian Sea Sturgeon Ranching Programme
Auteurs : D. H. Secor [États-Unis] ; V. Arefjev [Russie] ; A. Nikolaev [Russie] ; A. Sharov [États-Unis]Source :
- Fish and Fisheries [ 1467-2960 ] ; 2000-09.
Descripteurs français
- Wicri :
- topic : Mer Caspienne.
English descriptors
- KwdEn :
Abstract
Depletion of sturgeon stocks world‐wide has increased interest in aquaculture‐based restoration programmes. The Caspian Sea Sturgeon Ranching Programme (SRP) of the former Soviet Union represents a unique opportunity to evaluate expense, benefits and potential ecological and genetic effects of such restoration programmes. The SRP was initiated in the 1950s to compensate for lost spawning habitat in the Volga River and elsewhere. After its completion in 1962, the Volgograd Dam reduced spawning grounds in the Volga River system, the principal spawning tributary of the Caspian Sea, by ∼80%. For two of the three commercial sturgeon species (Russian sturgeon, Acipenser güldenstädti, and stellate sturgeon, A. stellatus), yields improved after the imposition of the 1962 moratorium on sturgeon harvests in the Caspian Sea. Volga River fisheries were managed for spawning escapement. Although imprecisely known, the contribution of the millions of stocked Russian and stellate juveniles during 1962–91 was most likely important to sustaining fisheries, although less so (contributing to <30% of the adult stock) than natural recruitment. Apparently, reduced spawning grounds, supplemented with artificial spawning reefs were sufficient to support reproduction and large fishery yields of Russian and stellate sturgeons. For beluga sturgeon, Huso huso, harvests in the Volga River were nearly all dependent upon hatchery stocking. Beluga sturgeon spawning grounds were mostly eliminated with the construction of the Volgograd Dam. Without the hatchery programme, beluga sturgeon in the Volga River and Caspian Sea would in all likelihood have been extirpated. Currently, sturgeons are severely depleted in the Volga River and Caspian Sea due to poaching and lack of co‐operation between countries exploiting the species. Aquaculture‐based restoration in Russia is now viewed a chief means of rebuilding stocks of Caspian Sea sturgeons.
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DOI: 10.1111/j.1467-2979.2000.00021.x
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ISTEX:7C8D98533B919B25B15ED11F3D161F15AD848196Le document en format XML
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<front><div type="abstract" xml:lang="en">Depletion of sturgeon stocks world‐wide has increased interest in aquaculture‐based restoration programmes. The Caspian Sea Sturgeon Ranching Programme (SRP) of the former Soviet Union represents a unique opportunity to evaluate expense, benefits and potential ecological and genetic effects of such restoration programmes. The SRP was initiated in the 1950s to compensate for lost spawning habitat in the Volga River and elsewhere. After its completion in 1962, the Volgograd Dam reduced spawning grounds in the Volga River system, the principal spawning tributary of the Caspian Sea, by ∼80%. For two of the three commercial sturgeon species (Russian sturgeon, Acipenser güldenstädti, and stellate sturgeon, A. stellatus), yields improved after the imposition of the 1962 moratorium on sturgeon harvests in the Caspian Sea. Volga River fisheries were managed for spawning escapement. Although imprecisely known, the contribution of the millions of stocked Russian and stellate juveniles during 1962–91 was most likely important to sustaining fisheries, although less so (contributing to <30% of the adult stock) than natural recruitment. Apparently, reduced spawning grounds, supplemented with artificial spawning reefs were sufficient to support reproduction and large fishery yields of Russian and stellate sturgeons. For beluga sturgeon, Huso huso, harvests in the Volga River were nearly all dependent upon hatchery stocking. Beluga sturgeon spawning grounds were mostly eliminated with the construction of the Volgograd Dam. Without the hatchery programme, beluga sturgeon in the Volga River and Caspian Sea would in all likelihood have been extirpated. Currently, sturgeons are severely depleted in the Volga River and Caspian Sea due to poaching and lack of co‐operation between countries exploiting the species. Aquaculture‐based restoration in Russia is now viewed a chief means of rebuilding stocks of Caspian Sea sturgeons.</div>
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