正・負荷重及びアロキサン投与のこいの脂質, 特にワックス・エステルに及ぼす影響

抄録

Carps of about 10 g weight were grouped and treated as follows, 1) removing swimbladder, 2) loading with lead belt, 3) stressed with laparotomy and vinyl belt, 4) loading with float, and 5) un loaded control. They were fed the diets supplemented with 1-hexadecanol, palmitic acid, and hexadecyl palmitate for 10, 20, and 30 d. The concentration ratio of wax esters (WE) to triglycerides (TG) were increased significantly in the plus loaded group and decreased in the minus loaded group in comparison to the stress and control groups. In either case the tendencies of ratios were 1>2>3=5>4 with a few exceptions in the case of palmitic acid supplement.
The diabetic carps induced with alloxan donation were characterized by the liberation of free fatty acids and by the significant increase of WE against the reciprocal decrease of TG comparing to the controls. The higher incorporation of [1-¹⁴C] acetic acid into WE in the swimbladderectomized carp and that of [1-¹⁴C] 1-hexadecanol in the hepatopancreas homogenate of diabetic carp were obserbed, respectively. The relationship of the two lipid classes, namely WE and TG, seems to be regulated by the hydrostatic conditions concerning the buoyancy and through the metabolism of the ester counterparts of fatty acids.