Effects of the rearing system of the Russian sturgeon (Acipenser gueldenstaedtii) on growth, maturity, and the quality of produced caviar

The present trial was conducted to evaluate two rearing systems (the recirculating aquaculture system "RAS" and a combined technique of RAS and cages) on the growth, puberty, and caviar quality of Russian sturgeon, Acipenser gueldenstaedtii. A 3727 two-year-old (1400±61.3 g) fish were rais...

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Bibliographic Details
Published inAquaculture, Aquarium, Conservation & Legislation Vol. 13; no. 6; pp. 3798 - 3809
Main Authors Elhetawy, Ashraf I G, Vasilyeva, Lydia M, Lotfy, Ayman M, Emelianova, Nadezhda, Abdel-Rahim, Mohamed M, Helal, Amr M, Sudakova, Natalia V
Format Journal Article
LanguageEnglish
Published Cluj-Napoca Bioflux SRL 01.12.2020
Subjects
Acipenser gueldenstaedtii
Aquaculture
Aquaculture systems
Aquaculture techniques
Cages
Caviar
Chromosomes
Conversion ratio
Diet
Eggs
Farming
Fecundity
Feed conversion
Females
Fish
Flavor
Flavors
Flavour
Food conversion
Freshwater fishes
Gametocytes
Gonads
Growth
Individual rearing
Oocytes
Proteins
Puberty
Recirculating aquaculture systems
Sex
Sturgeon
Survival
Systems analysis
Water quality
Water temperature
Weighing
Russia
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Summary:The present trial was conducted to evaluate two rearing systems (the recirculating aquaculture system "RAS" and a combined technique of RAS and cages) on the growth, puberty, and caviar quality of Russian sturgeon, Acipenser gueldenstaedtii. A 3727 two-year-old (1400±61.3 g) fish were raised in RAS and cages, for 180 days, at 20 kg m-3. Growth, feed conversion ratio (FCR), and survival have significantly increased for fish grown in RAS system. Early sex diagnosis of sturgeon (2.5 years old) showed that 97% of the fish grown in cages have clear gonads, while in RAS, it was difficult to determine sex, as the gonads were not visible and had a large content of fat, and less than 10% of fish have gonads. In RAS, the first 15 females gave eggs, aged 5-6 years, and weighing 9.39±0.21 kg. In cages, the first 15 specimens produced eggs aged 6-7 years and weighing 7.25±0.2 kg. Females matured in cages showed superiority in the fecundity and the size of oocytes, along with the natural flavor of eggs compared with those obtained from females ripen in RAS with a specific flavor, which is undesirable.
ISSN:1844-8143
1844-9166