Scientists from the Tyumen branch of VNIRO have counted the new generation of whitefish

 

The scientific group worked on the Severnaya Sosva River within the boundaries of the Berezovsky District of Yugra. Larvae of five species of whitefish are traditionally recorded here: whitefish, peled, broad whitefish, tugun and nelma.

 

The larvae begin to hatch from the eggs with the first spring rise in water level and immediately roll downstream. After the ice melts, there are no larvae left in the spawning grounds. Downstream migration continues until the future young reach the sors. And here the most important period begins - the transition to independent feeding. It determines the future fate of the young generation, because it is at this time that the probability of dying from a lack of food, predators or storm winds is high.

 

On the river, fisheries scientists conducted comprehensive studies to assess the conditions in which the larvae develop, in particular, they measured the flow rate and recorded the level of the rise of flood waters. In addition, they took samples of phyto-, zooplankton and benthic communities, as well as samples of water and bottom sediments for hydrochemical analysis. Samples were taken from the banks, the riverbed and in the nearby sor system.

 

Together, the collected data will help to assess the effectiveness of the natural reproduction of valuable fish and obtain reliable information on the possible replenishment of the commercial stock.

 

Press service of VNIRO