Phenological observations of abiotic environmental factors (water level and temperature, air temperature, dissolved oxygen content in water) were carried out in the studied areas, ichthyological samples were collected, followed by biological analysis of the caught fish. At the same time, observations were made of the activity of amateur fishermen.
The catches in the second half of April were mainly bream (more than 75%) and roach (18%). Carp, crucian carp and pike were occasionally found in the catches. Due to a slight cold snap and a drop in the water level in the second ten days of April, a weak spawning run was observed. Most of the fish were concentrated in the estuary areas of the Ob channels, closer to the shore.
Reproduction of pike and ide in the spawning period of 2025 took place under favorable conditions. No sharp fluctuations in water level were observed. Spawning took place in the second ten-day period of April at a water temperature of 6.0 - 8.5 °C. Spawning of roach and freshwater perch took place under less favorable conditions (at the beginning of spawning with a sharp drop in the level) in the third ten-day period of April at a water temperature of 8.5 to 11.0 °C.
Press service of VNIRO
