| Summary: | 碩士 === 國立海洋大學 === 漁業科學學系 === 89 === In different ecological habits, fishes use different muscle fiber composition to execute different swimming movement. In order to understand the swimming performance for the different life mode, the present research studied on the skeletal muscle fiber types of the striped mullet (Mugil cephalus) during their ontogenetic development and annual variation.
On the basis of various histochemical characteristics (responses of ATPase, SDH, NADH-TR and LDH) of skeletal muscle fibers, those fiber types in each muscle area were confirmed. White muscle area contained 1 fiber type (IIb). Pink muscle area contained 3 fiber types (I, IIb, IIc). Red muscle area, including 3 zones (S, T, R), contained 2 fiber types (I, IIc), 1 fiber type (IIc) and 3 fiber types in S (superficial) zone, T zone (between S and R zone) and R zone (between T zone and pink muscle area), respectively.
Types and composition of muscle fiber was varied with the fish growing. The ontogenetic change of white muscle was depended on fiber hyperplasia and hypertrophy in fish less than 25 cm TL, and then hypertrophy participated the growth function from 25 cm TL onwards.
Some type IIc muscle fibers were found in white muscle area in both August 1999 and 2000. These fibers gradually transit to IIb fibers early winter before spawning migration. These fibers should be from hyperplasia of white muscle for the preparation of migration.
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