BACKGROUND Non-tuberculous mycobacteria responsible for piscine mycobacteriosis usually produce visceral granulomas in both freshwater and marine species. In this study, the first occurrence of Mycobacterium chelonae associated with tumor-like lesions in the Russian sturgeon (Acipenser gueldenstaedtii) is reported. Fifteen sturgeons from an Italian fish farm showing skin and oral cauliflower-li...

persian sturgeon (acipenser persicus) is a valuable fish caught in the caspian sea. in this study, effect of frying, the most common cooking methods on nutritional properties of the persian sturgeon fillet were investigated. the raw and fried samples were analyzed for amino acid composition, protein and fat content, in vitro digestibility and nutritional parameters. the results showed that the ...

The micropyle number in the ova of sturgeon species from the South Caspian Sea was investigated. The study was conducted on female broodfishes of three species of sturgeon (Persian sturgeon Acipenser persicus, Stetates sturgeon A. stellatus and great sturgeon Huso huso) included 44 Persian sturgeon, 13 stellate sturgeon and 8 great sturgeon specimens. Fifty eggs were randomly collected from eac...

For the foreign student it is very important to own skills of the academic letter. It is an important indicator of professional and research competence of the student. The mobility of foreign graduates of the Russian higher education institutions depends on their level of proficiency in the academic Russian letter as communications between the educational and scientific organizations extend at ...

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...

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 ...

Progeny from six different spawns of white sturgeon broodstock were monitored for 20 months in a commercial white sturgeon hatchery for occurrence of outbreaks of white sturgeon iridovirus Ž . Ž . WSIV and white sturgeon herpesvirus-2 WSHV-2 . Five WSIV but no WSHV-2 outbreaks occurred during the study period. Signs of WSIV were restricted to tanks from a single spawn Ž . each time except for o...

Basal ray-finned fishes possess a heterocercal tail in which the dorsal lobe containing the extension of the vertebral column is longer than the ventral lobe. Clarifying the function of the heterocercal tail has proved elusive because of the difficulty of measuring the direction of force produced relative to body position in the aquatic medium. We measured the direction of force produced by the...