Nature of Adipose Tissue of Ayu Associated with Water Velocity

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  • Nature of Adipose Tissue of Ayu Associa

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Based on the result that the water velocity of a rearing pond greatly influenceslipid mobilization, this paper examines the nature of intraperitoneal fat body (PF) on ayu Plecoglossus altivelis reared ina low water velocity (4cm/s) and high water velocity (55cm/s) pond for 58 days.<br> Water velocity scarcely influenced lipid content of IPF, but high water velocity increased thelipid/DNA ratio which isused as an index of adipose cell size. Fatty acid and triglyceride compositionswere not influenced by water velocity.<br> Although water velocity had no effect on serum fatty acid level, the free fatty acid level in IPF wasslightly higher at thehigh water velocity. In vitro lipolysis activity was defined as the level of fatty acidsreleased from an IPF slice during 120 min incubation. The high water velocity increased the activity, despite the difference in sensitivity to lipolytic hormones. Rearing in high water velocities induced highlipolysis activity to adapt to high energy requirements.

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