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KMID : 0894520030070010029
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Development & Reproduction
2003 Volume.7 No. 1 p.29 ~ p.34
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Development of the Digestive Tract in Tiger Puffer (Takifugu rubripes)
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김봉원/Kim BW
나오수/박창범/고환봉/강법세/최영찬/이영돈/Na OS/Park CB/Go HB/Kang BS/Choi YC/Lee YD
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Abstract
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Anatomical and histological observations were used to examine the morphological differentiation and development of the digestive tract during ontogenesis in tiger puffer, Takifugu rubripes. Before hatching, the digestive tract was located between yolk sac and notochord of embryo. Newly hatched larvae had a straight tubular digestive tract. The larval mouth opened at 2 days after hatching (DAH). At 4 DAH, sphincters separated the digestive tract into the esophagus, anterior intestine, mid-intestine and rectum, and the anus was opened. At 5 DAH, the larval intestine bent between the anterior and intermediate parts and mucous cells developed in the esophageal epithelium. At this time yolk sac was absorbed completely. At 6 DAH, the digestive tract was differentiated into the U type with expansion of the anterior intestine toward the head of the larvae. At 10 DAH, the expanding anterior intestine became wider and a elliptical. At 15 DAH, the anterior intestine was divided into two portions by invagination of dorsal epithelium and the mid-intestine was convoluted dorsally. At 21 DAH, the frontal portion of the anterior intestine formed a differentiated expansion sac. At 24 DAH, the second convolution was observed in the anterior part of the posterior intestine. At 30 DAH, the expansion sac was extended longitudinally and the digestive tract took on the form seen in adult fish.
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KEYWORD
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Development, Digestive tract, Expansion sac, Histology, Tiger puffer
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