PECULIARITIES OF FISH REPRODUCTION IN THE OB IN THE AREA OF NOVOSIBIRSK
Abstract
After constructing Hydro Power Station on the Ob in the area of Novosibirsk, the authors observed that the conditions for reproduction of sturgeons and whitefish were kept. Species and number of young fish in the dam basin was formed by means of young fish migration from the basin. The researchers observed pike perch larvae and bream larvae in the years when low level of water was observed. When high level of water was observed, the authors found the species located in the upper layers of the basin. Nerfling species dominated in the Ob gulfs near the dam. Due to these fish migrating from the reservoir of juveniles and pike-perch larvae from river spawning temporary communities of juveniles are created in the riverbed with the duration of existence from 14 to 33 days. Young fish communities with livability from 14 to 33 days are formed by means of young fish and pike perch migrating from the basin. The maximum number of larvae in the river (0.617-0.703 EQ/m)3 was observed in the 1990s at maximum fish yield in the river and basin. Bream and pike-perch made more than 90% of fish yield. The number of young fish was much higher and equal to 29.9 – 102.7 samples/ m3 in the coastal shallow waters in the area of the spawning grounds. Carp species were mostly observed. The duration of young fish communities livability in the coastal area was 4-5 days more in comparison with that in the basal places. In the last decade, the conditions for fish reproduction in the Ob of Novosibirsk area are getting worse. Lower migration of the young fish from the basin influences its quantitative and specific composition in the river. The authors revealed reducing of young fish in the Ob basin, especially pike perch which is the most valuable commercial species. Low part of young fish migrating from spawning areas is supposed to reduce livability due to lack of conditions for feeding on shallow waters where the larvae are absorbed by pumps and die in the basins of the water consumed.
About the Authors
A. M. Vizer
Novosibirsk branch of State Research and Industrial Fishery Centre, Novosibirsk
Russian Federation
Candidate of Biology
Russian Federation
Candidate of Biology
L. S. Vizer
Novosibirsk branch of State Research and Industrial Fishery Centre, Novosibirsk
Russian Federation
Dr. of Biological Sc.
Russian Federation
Dr. of Biological Sc.
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Review
For citations:
Vizer A.M., Vizer L.S. PECULIARITIES OF FISH REPRODUCTION IN THE OB IN THE AREA OF NOVOSIBIRSK. Bulletin of NSAU (Novosibirsk State Agrarian University). 2018;(1):120-126. (In Russ.)
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