Changes in the glycogen content of Pacific herring, Clupea pallasi, during metamorphosis and the subsequent juvenile stage
1993
Fukuda, M. (Nansei National Fisheries Research Inst., Ono, Hiroshima (Japan))
The glycogen content of the head, viscera and trunk of Pacific herring larvae and juveniles was measured during metamorphosis and the subsequent juvenile stage of development. The total glycogen content of both the viscera and trunk increased rapidly over the size range of from 25 to 30mm standard length (SL) when metamorphosis occurred. Then the glycogen content of the viscera decreased gradually whereas that of the trunk continued to increase. The concentration of glycogen (i.e., the amount per unit weight) in the viscera reached a peak at about 30mm SL and was three times higher than that of the trunk. However, past 30mm SL the glycogen concentration of the viscera decreased rapidly with growth, finally reaching about the same value as that of the trunk. The total content of glycogen of the head increased slowly and the concentration of glycogen in the head remained nearly constant during the larval and juvenile stages. The glycogen in the viscera and trunk is considered to originate from the liver and muscle, respectively. The results suggest that the liver is the main organ for energy storage during metamorphosis. The role of glycogen storage then shifts from the liver to both the liver and muscle with the onset of muscle development upon entering the juvenile stage
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