Did a test session at Sura, and was pretty surprised by the results.
The weather turned to rainy/cold. For Sura, the best conditions for bottom fishing (wild carp, burbot, sterlet, russian sturgeon, catfish etc...) are temperatures under 24°C during the day and rain.
This time, the temperature max. was 19°C, and it was raining all the time.
I had a frenzy with sturgeons. I fished for around 2h15, and I had bites all the time. But a 44kg russian sturgeon took me around 45 minutes to land it.
When rain stopped, and sun appeared, with temperature over 24°C, bites stopped.
I will try again tomorrow, as a test, and try during hot sunny days again. But I won't be surprised if it will be a fail.
Rig and baits: rhino beetle larvas and nightcrawlers worked the best for me
Weather: rain and max +19°C
Period: with the appropriate weather, it's just firer, so 24/24. The 44kg has bitten at around 8:00 am.