Changes in Lipid Composition in Amur Sleeper Percottus glenii (Dybowski, 1877) Yearlings Depending on Body Length in the Floodplain Lake Krugloye (Saratov Reservoir)

Abstract

Changes in the total content and composition of lipids in yearlings of the Lake Krugloye Amur sleeper depending on their body length during the active feeding period have been analyzed. It is found that fatness of the juvenile Amur sleeper does not change with an increasing body length. The seasonal dynamics of fatness is expressed to a greater degree in fish of the same size. The lipid composition of juvenile specimens of the Amur sleeper varies considerably depending on the length of the body of the fry and the time of observation. The character of the fractional composition of lipids in yearlings of the Amur sleeper with body lengths >25–29 mm in September and October indicates a decline in food supply of the largest specimens of the generation by the end of the active feeding period and their lower readiness for wintering.