Abstract
As the only sturgeon living in freshwater, sterlet is important for breeding in industrial fish farms, where lately cases of early mortality of this species have been detected. Hence, in order to preserve the species, it is important to study the parameters of fatty acid (FA) composition of lipid fractions of the blood serum of sterlet. Here we present changes of fatty acid composition in different lipid fractions of the blood serum of sterlets of different age (namely two-, three- and nine-year-old) with the masses 0.3–0.4, 0.5–0.6 and 5–6 kgfor the age-groups of fish, respectively. Fatty acid (FA) composition was determined using gas-chromatography on HRGC 5300 (Italy) in Palladin Institute of Biochemistry of the National Academy of Sciences of Ukraine (NASU). Fatty acid composition of starlet blood serum is presented by saturated and unsaturated high-molecular weight carboxylic acids, mostly palmic, stearic, oleic and linoleic. In the phospholipids fraction, there was a moderate increase in saturated and monounsaturated fatty acids and a slight decrease in polyunsaturated fatty acids depending on the age of fish. As for free fatty acids, there was a drop in the saturated ones depending on the starlet age. Among the free fatty acids of sterlet blood serum, we identified 28 acids, of them 39 %, 35 % and 30 % were saturated in 2-, 3-year-old and mature fish, respectively. Monounsaturated FA content was 14 %, 23 % and 23 % in 2-, 3-year-old and adult sterlet fish, and polyunsaturated FA content –46 %, 41 % and 36 %, respectively. The data can be used for the theoretical verification of correcting supplementary feed and premixes.
Highlights
Fatty acids composition of lipids in organs and tissues of fish depends on several factors: species, age, conditions of breeding, feeding type [1]
According to the results of research in phospholipids of the blood serum in sterlet, it was recorded a slight increase in the content of saturated and monounsaturated fatty acids, and a decrease of the level of polyunsaturated fatty acids with age (Fig. 1, a)
The proportion of polyunsaturated fatty acids in the composition of phospholipids of the blood serum of sterlet is more than 30 % of the total amount of fatty acids
Summary
Fatty acids composition of lipids in organs and tissues of fish depends on several factors: species, age, conditions of breeding, feeding type [1]. They take part in metabolic processes, colon absorption of vitamins and minerals and accumulation of energy. Fatty acids in the composition of lipid compounds are structural elements of the membrane which simultaneously act as the main substrates of the lipid peroxidation processes. Available in the literature data [4] indicate difference in the content of lipids and their fatty acid composition in the tissues of pond fish due to the species and age diversities. Peculiarities of the fatty acid composition of lipids, including various factions lipid in tissues of sterlet depending on age were studied less, therefrom deepening these investigations is topical
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