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Syrdarya false pathogen

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Syrdarya false pathogen (Syr Darya sturgeon) river fish, found along the plains of the Syr Darya. Discovered in 1871 by the outstanding Russian geographer and traveler A.P. Fedchenko. Reaches a length without tail filament of 27 cm, with a tail filament of 36 cm. It feeds mainly on aquatic insect larvae. From 1959 to 1968, only 20 individuals were caught; there were no later captures.

It differs from Amu Darya pseudopatonids in a large number of dorsal (15-22) and lateral (37-46) bugs. The body between the rows of bugs is covered with bone grains. Upper lip with notch; lower lip interrupted in the middle. On the outer edge of the pectoral fin, the same fold as that of the small Amu Darya pseudopatonos. There are no thorns on the head and snout. The tail thread may be well developed or absent. The snout is elongated in some, shortened in others. In the dorsal fin 30-34 rays, in the anal 19-20. Gill stamens are lanceolate, number 9. In adults, rudimentary teeth are visible in the magnifying glass on the palate. The length of the intestines of the shovelnose from Karadarya is 60-78, an average of 71.5% of the body length.

3 forms can be distinguished: 1) longirostris - typical: long-necked specimens without (or almost no) tail filament, 2) brevirostris - short-necked with a long tail filament, 3) intermedia - with a moderately elongated snout, there is a tail filament. All these forms are often caught in the same catch.

Length without tail thread up to 27 cm, with thread over 34.7 cm.

Spread

Syrdarya pseudopathy - endemic of the Syr Darya - from Fergana to the mouths. In lakes and other bodies of water is absent.

It feeds on bottom invertebrates and aquatic insect larvae. In Karadarya, he also consumes roach and bream eggs.

Economic value

Syrdarya pseudo-pathogen is not of economic importance. A very rare, possibly already extinct species, since over the past 2-3 decades there has been no information about the capture of the Syrdarya pseudopatonos.

Literature:
1. Lebedev V.D., Spanovskaya V.D., Savvaitova K.A., Sokolov L.I., Tsepkin E.A. USSR fish. Moscow, Thought, 1969
2. L. S. Berg. Freshwater fish of the USSR and neighboring countries. Part 1. Edition 4. Moscow, 1948
3. Rare and endangered animals. Pisces: Reference, allowance / D. S. Pavlov, K. A. Savvaitova, L. I. Sokolov, S. S. Alekseev, Ed. V. E. Sokolova. - M .: Higher. school., 1994 .-- 334 p.: ill.
4. Fishes of Kazakhstan: 5 tons / Mitrofanov V.P., Dukravets G.M., Peseridi N.E. et al. - Alma-Ata: Nauka, 1986. T. 1. Lampreys, Sturgeons, Herring , Salmon, Pike. - 272 p.

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