Effect of alimentary deprivation on quantitative and time characteristics of nutrition of the goldfish in norm and under action of adrenalin

Abstract

Effects of the intraperitoneally administered adrenalin (0.14 mg/kg) on volume and time characteristics (duration) of the individual, grouped, and summarized nutrition was studied in goldfish Carassius auratus (L.) previously kept on normal and restricted (for 10 and 15 days) ration. The fish on restricted ration demonstrated the two-phase alimentary response to the adrenalin injection similar with that in normally feeding fish: a decrease in volume and in the grouped and summarized duration of nutrition in the first phase of the hormone action and an increase-in the second phase; however, the value of the effect in the first phase was lower, while in the second phase-higher than in the fish that obtained before the experiment the sufficient amount of food. Duration of individual nutrition increased in all fish groups, including the control one, the maximal increase being observed in goldfish submitted to alimentary deprivation. The content of glycogen in hepatopancreas of the normally fed goldfish by the end of experiment exceeded that in fish restricted in nutrition 4.5–6 times. The obtained results confirm the suggestion that a decrease of level of reserved substances in the body leads to reduction of susceptibility of fish to the stress hormoneadrenalin and, hence, to a change of the value of its effects on the goldfish food-procuring activity, with preservation of dynamics of parameters.