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《Chinese Journal of Zoology》 2011-06
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Hyperplastic and Hypertrophic Growth of Skeletal Muscle Fibers of Mandarin Fish(Siniperca chuatsi) at Early Developmental Stage

ZHU Qiong① ZHAO Jin-Liang① CHANG Jian-Ju① Jeerawat THAMMARATSUNTORN① QIAN Ye-Zhou② WU Chao② QIAN De② ① Key Laboratory of Freshwater Aquatic Genetic Resources,Ministry of Agriculture,Shanghai Ocean University, Shanghai 201306;② Chizhou Institute of Special Aquaculture,Chizhou 247100,China  
Skeletal muscle is the main composition to body weight in fish,which provides an important indicator for somatic growth.To fully understand skeletal muscle development of mandarin fish(Siniperca chuatsi) at the early stage,paraffin sections of the first dorsal myomere of skeletal muscle at 1-41 days after hatching were carried out;fiber numbers and total fibre area were measured to describe hyperplastic and hypertrophic growth of skeletal muscle.The results showed that skeletal muscle growth of mandarin fish included increasing of both fibre numbers(hyperplasia) and fibre area(hypertrophy) at the early development stage,the total fiber numbers in the right first dorsal myomere increased from 40 to 520,and the total fiber area increased from 805.30 μm2 to 186 422.77 μm2.During the 1-9 days after hatching,the relative increased fiber numbers decreased and the relative increased fibre area raised slowly,the contribution rate of hyperplastic growth dropped dramatically from 60.53% to 8.80%,as opposite to hypertrophic growth.At the period of 9-15 days after hatching,the relative increased fiber numbers raised and relative increased area was on a steady phase,the contribution rate of hyperplastic growth increased from 8.80% to 20.26%,while hypertrophic growth contribution ratio decreased slightly.At the 15-41 days after hatching,both the relative increased fiber numbers and area were on the rise,the contribution rate of hyperplastic growth decreased to a steady phase and hypertrophic growth(from 79.76% to 87.41%) gradually became the dominant contributor of skeletal muscle growth.
【Fund】: 上海市科委重点基础项目(No.09JC1406900);; 上海市重点学科建设项目(No.Y1101)
【CateGory Index】: S917.4
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