Abstract
Mechanisms of formation of phenotypic groups of fingerlings of the Atlantic salmon are investigated, related to diversity of embryos and subsequent start possibilities of dispersion of larvae to microbiotopes differing in their life conditions. The fingerlings of salmon, which after hatching and dissolution of the yolk sac moved from the mainstream of the Varzuga River to mouths of its tributaries, had an increased level of triacylglycerols and a higher growth rate than the juveniles remaining in the coastal zone of the river. The revealed differences between the compared groups of fingerlings by the spectrum of stock and structural lipids are mainly connected with distinctions of feeding of juveniles of the same age. The found stable differences by lipid spectra in fingerlings of salmon from the investigated biotopes of the Varzuga in July, August, and October are considered as biochemical prerequisites of the origin of different phenotypic groups of juveniles. Subdivision of fingerlings into phenotypic groups may further on influence the oncoming of the smoltification time of juveniles at the age 2+, 3+, and 4+. Accordingly, this is reflected in formation of the complex age structure (by the number of years spent in the river and in the sea) of the Varzuga population of Atlantic salmon.
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Original Russian Text © D.S. Pavlov, Z.A. Nefedova, A.E. Veselov, N.N. Nemova, T.R. Ruokolainen, O.B. Vasil’eva, P.O. Ripatti, 2008, published in Voprosy Ikhtiologii, 2008, Vol. 48, No. 5, pp. 679–685.
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Pavlov, D.S., Nefedova, Z.A., Veselov, A.E. et al. Lipid status of fingerlings of the Atlantic salmon Salmo salar from different microbiotopes of the Varzuga River. J. Ichthyol. 48, 648–654 (2008). https://doi.org/10.1134/S0032945208080110
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DOI: https://doi.org/10.1134/S0032945208080110