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Downstream migration of young sturgeons in the Ural River Biological bases of the fishing industry in Central Asian and Kazakhstan waters


Nauka Alma Ata : 49-51
Downstream migration of young sturgeons in the Ural River Biological bases of the fishing industry in Central Asian and Kazakhstan waters
In the lower reaches of the Ural River and on the spawning grounds, in 1961 and 1962, the following immature specimens were captured by means of an ichthyoplankton net and a fry net: 178 spiny sturgeon, 208 beluga sturgeon, 785 Russian sturgeon and 1697 sevriuga (stellate sturgeon). The downstream migration of sevriuga, Russian and spiny sturgeon started in the 3rd 10-day period of May; that of beluga, in the 2nd 10-day period of May. Sevriuga and spiny sturgeon remained in the river for overwintering (the latter for 1 year); Russian and beluga sturgeon descended to the sea in their 1st year of life. During the seaward migration the young fish aggregated in deep holes where the rich benthos promoted their growth.


Accession: 024513431



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