Abstract Ray-finned fishes comprise nearly half of extant vertebrate species and include several ancient lineages with fossil records that stretch over 200 Myr in time. One these old clades, the sturgeons paddlefishes, is distributed across Northern Hemisphere includes some largest known freshwater fishes. Yet, record this lineage (Acipenseriformes) poor compared to similarly ray-finned fish cl...

Aquaculture is one of the fastest growing food industries in world today. The share aquaculture fish production every year. Over past 50 years, volume farming has increased by more than million tons, while growth catch stopped 80s last century. most promising and at same time underestimated areas economic activity agro-industrial complex Ukraine, which, with rational use water resources, able t...

The article presents the results of assessing exterior indicators sturgeon hybrids when grown under certain conditions. Experimental studies were carried out at LLC "Mulinsky fish farm" Nizhny Novgorod region in 2019-2022. object study was sturgeons different genotypes (Russian - group 1, Siberian 2, Russian with 3 and species 4). In a comparative aspect, growth rates various genotypic groups d...

Since sturgeons have no external sexual dimorphism and there are no external markers to determine sex, internal examination of the gonads should be used to sex identification. The present study describes the biopsy method and histological observations of the gonads of great sturgeon (Huso huso) in both sexes at different age classes. Sex and maturity stages of 226 great sturgeons were identifie...

In species with long life cycles and discontinuous availability of individuals to reproduction, implementing a long-term captive breeding program can be difficult or impossible. In such cases, managing diversity among familiar groups instead of individuals could become a suitable approach to avoid inbreeding and increase the possibility to accomplish a breeding scheme. This is the case of sever...

The most utilized method to measure swimming performance of fishes has been the critical swimming speed (UCrit) test. In this test, the fish is forced to swim against an incrementally increasing flow of water until fatigue. Before the water velocity is increased, the fish swims at the water velocity for a specific, pre-arranged time interval. The magnitude of the velocity increments and the tim...

Temperature and selenium are two environmental parameters that potentially affect reproduction and stock recruitment of sturgeon in the San Francisco Bay/Delta Estuary. To identify proteins whose expression is modified by these environmental stressors, we performed a proteomic analysis on larval green and white sturgeons exposed to 18 or 26 degrees C and micro-injected with Seleno-L-Methionine ...