Abstract
The present research focused on determining the lipid status of salmon fingerlings (0+) in early development after dispersal form groups of spawning nests in biotopes of different hydrological conditions. The revealed qualitative and quantitative differences in the levels of phospholipids and fatty acids among two generations of Atlantic salmon fingerlings (0+) living in different biotopes of the Arenga River (a tributary of the Varzuga River) may be associated with the peculiarities of their genetically determined processes of the biosynthesis and modification of individual lipid classes and trophoecological factors (food spectrum, quality and availability of food objects, and hydrological regime). The research was organized to observe the dynamics of these developmental changes from ages 0+ to 2+.
Highlights
In the Russian North, the largest stock of Atlantic salmon (Salmo salar L.) reproduces in the Varzuga River in the basin of the White Sea (Kola Peninsula)
The results reveal different metabolisms for polyunsaturated fatty acids (PUFA) among the fingerlings of the two generations
Among the fingerlings from under the waterfall of the Arenga tributary, we found high contents of polyunsaturated ω-3 fatty acids, mainly due to docosahexaenoic 22:6(ω-3) acid, and these high contents may be one of the biochemical adaptation mechanisms associated with the specific habitat conditions and hydrological regime (Table 1)
Summary
In the Russian North, the largest stock of Atlantic salmon (Salmo salar L.) reproduces in the Varzuga River in the basin of the White Sea (Kola Peninsula). From 25 to 70 thousand salmon spawn annually in the river. In the year following spawning, when the spring flood is completed and water temperature increases up to 11–12 °C, salmon alevins that have hatched appear on the shingly bottom surface and begin to settle in their future places of habitation. This process is largely randomly determined, with active-passive dispersal in microsites characterized by different hydraulic and feeding conditions [3]
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