Nukus Balyk hatchery water supply system to provide Amu Darya shovelnoses with Amu Darya river water

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Nukus Balyk fish hatchery (Nukus, Karakalpakstan, Uzbekistan)
09.04.2025

In 2020 Nukus Balyk fish hatchery (Nukus, Karakalpakstan, Uzbekistan) was registered as Amu Darya shovelnose sturgeons propagation hatchery. It provided the Amu Darya shovelnose conservation project () with a line of recirculating aquaculture system (RAS). Water in the system is refreshed from the Amu Darya river through the Kyzketken (Dostlyk) canal.
Creating an initial brood stock of Amu Darya shovelnose sturgeons is the first step towards their propagation and conservation efforts.

According to our experience Amu Darya shovelnose sturgeons (Pseudoscaphirhynchus kaufmanni and Pseudoscaphirhynchus hermanni) are very sensetive to specific water properties but this issue has not been studied enough yet. That's why we are especially concerned about supplying Amu Darya shovelnoses with the water from the Amu Darya river where they live in the wild. But the muddy Amu Darya water is not suitable for a recirculating aquaculture system (RAS). So we have to let the muddy water pass trough a U-shaped pond (with entrance in the one end of the pond and exite from the other) for mud to settle down. Than the settled water is pumped into the intermediate tank and flows from it into recirculating aquaculture system (RAS) where Amu Darya shovelnoses are being kept to refresh water in RAS.