Big Amu Darya Shovelnose Sturgeon (Pseudoscaphirhynchus kaufmanni)
Small narrow snout (dwarf) form
https://life-on-earth.ru/amu-darya-and-syr-darya-shovelnose-sturgeons/amu-darya-shovelnose-sturgeons-pseudoscaphirhynchus-nukus-balyk-hatchery-brood-stock-data-base/2-uncategorised/112-pseudoscaphirhynchus-kaufmanni-nukus-balyk-hatchery-brood-stock-inaturalist-253558384-chip-401875#sigProId1f41ad2282
The first 6 photos were taken on 04.04.2026
The next 10 photos were taken on 20.11.2024
iNaturalist link:
https://www.inaturalist.org/observations/253558384
Microchip implant 900263000-401875
Implanted 10.04.2025
Origin:The Amu Darya river, town of Khanka area (Khorezm province, Uzbekistan); 16.11.2024; weight 94,7 g
The weight data may not be correct before 04.04.2026 due to scales lapse that were not properly checked.
Ultra sound screening with AcuVista VT880a portable water proof ultra sound scanner:
Date: 10.04.2025
Result: not determined, probably female, maturity stage II-III
In the beginning it was unclear whether it was a female with tiny eggs or a mature male; to solve that issue a biopsy was taken with negative result on eggs, that's why experimental carp pituitary extract injections to stimulate spermitation were made in case it was a mature male - with negative result on spermitation. The futher consultations on ultra sound screening image inclined us to the idea that it is a female.
Weight on 10.04.2025 - 90,1 g
Date: 04.04.2026
Result: sex is not determined, it may be a male ready to spawn or a female with tiny eggs, more likely a male ?
Weight on 04.04.2026 - 93 g
Videos of ultra sound screening on 04.04.2026:
Links to RUTUBE:
https://rutube.ru/video/99345181dcc7d5063ae4e2b0e1d4c0e9/
https://rutube.ru/video/f6af1851ead43ab90d2f3dc369a56382/
Videos of ultra sound screening on 10.04.2025:
Biopsying to determin the sex of a shovelnose when ultra sound screening shows no precise result on whether the fish is a male or a female
Date: 10.04.2025
Result: no tiny eggs found
Video of biopsying to determin the sex of a shovelnose when ultra sound screening shows no precise result on whether the fish is a male or a female on 10.04.2025
Experimental carp pituitary extract injection to stimulate spermitation in case it was a mature male
Dates: 10-12.04.2025
Result: negative
Video of experimental carp pituitary extract injection to stimulate spermitation in case it was a mature male on 10.04.2025: