Effects of Starvation and Subsequent Refeeding on Formation and Resorption of Acellular Bone in Tilapia, Oreochromis niloticus(Physiology)
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概要
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Fish undergo a brief growth spurt known as "compensatory growth" when they resume adequate feeding after a restricted food intake. In the present study, changes in formation and resorption of acellular bone during the compensatory growth period were quantified using bone histomorphometry. Juvenile tilapia (Oreochromis niloticus) were starved for 15 days and subsequently refed for 15 days. In the starvation period, osteoblastic activity decreased linearly with time and almost reached zero on day 15, whereas the significant reduction in osteoclastic activity first became evident on day 15. This resulted in an increased percentage of eroded bone surface, which is the bone surface affected by osteoclasts. In the refeeding period, osteoblastic activity recovered to the levels of fed fish on day 3, briefly increased above the levels of fed fish on day 7, then returned to those of fed fish on day 15. Osteoclastic activity gradually increased and returned to the levels of fed fish from 7 days onwards. The eroded surface rapidly decreased to the levels of fed fish on day 3, became significantly lower than those of fed fish on day 7, and then returned to those of fed fish on day 15. It is concluded that starvation leads to a decreased turnover rate in tilapia acellular bone, which can be reversed by subsequent refeeding. A brief increase in bone-forming activity above the levels of fed fish, "the compensatory bone-formation", is a characteristic feature of the recovery period.
- 社団法人日本動物学会の論文
- 2001-07-01
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- Effects of Starvation and Subsequent Refeeding on Formation and Resorption of Acellular Bone in Tilapia, Oreochromis niloticus(Physiology)