人工孵化クロマグロ仔稚魚の消化系の発達と消化酵素活性

DOI 日本農学文献記事索引 Web Site 被引用文献6件 参考文献26件

書誌事項

タイトル別名
  • Development of Digestive System and Digestive Enzyme Activities of Larval and Juvenile Bluefin Tuna, Thunnus thynnus, Reared in the Laboratory.
  • Development of Digestive System and Dig

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抄録

Development of digestive system and changes in the activity of trypsin-like enzyme, pepsin-like enzyme and amylase were studied in larval and juvenile Bluefin tuna, Thunnus thynnus reared in the laboratory. Liver, gall bladder, pancreas, and the demarcating region between intestine and rectum formed within 36 h after hatching. After feeding commenced trypsin-like enzyme and amylase activities increased as the larvae grew. During the preflexion phase (within 10 days after hatching), revolution of the intestine concluded; and pharyngeal teeth and mucous cells of esophagus differentiated. During the flexion phase (11 to 17 days after hatching), functional jaw teeth were found and blind sac, gastric glands and pyloric caeca begin to form. Pepsin-like enzyme activity increased and functions of stomach and pyloric caeca developed from the postflexion phase to the transitional period to the juvenile (17 to 25 days after hatching) . The rate of percentage of preanal length to standard length was constant (around 40%) until 11 days after hatching, then increased to 65% at day 26, and did not change from 26 days to 30 days. These results suggest that the developments of the digestive system until 11 days (preflexion phase) are mainly qualitative and those from then to 26 days (flexion phase to postflexion phase) are both qualitative and quantitative. This quantitative and qualitative development of the digestive system might contribute to the rapid growth in the juvenile stage.

収録刊行物

  • 水産増殖

    水産増殖 46 (1), 111-120, 1998

    日本水産増殖学会

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