イワナ，Ｓａｌｖｅｌｉｎｕｓ　ｐｌｕｖｉｕｓ，の口部歯系の発達について

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  • Development and growth of dentition in hatchery-reared Salvelinus pluvius.

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It has been long known that the tooth characters and the form of tooth-bearing bones in the mouth are valuable as a taxonomic character in Salmonidae. This paper is a report on the development and growth of dentition in the mouth during larval and juvenile stages in the char, Salvelinus pluvius.<BR>The first indication of conical teeth on the pre-maxillary, maxillary and dentary was observed in about 15mm in standard length (SL), 10 day old, on glossohyal when the fish became about 18mm SL, 20 day old, on palatine about 19mm SL, 30 day old, and on vomer about 23mm SL, 70 day old. These fish grew at a rate of 0.14mm per day up to 40th day of development, but between the 40th and 100th day, growth slowed to 0.03mm per day. During this period, the total number of teeth and the individual tooth length increased with age. And, the fully developed dentition was found in the mouth of specimens exceeding 53mm SL, 150 day old. The length of teeth increased with age during young and adult stages. The percentages of functional teeth number to total number of teeth on the dentary and maxillary in 18-25mm SL char, 90 and 100 day old, were the highest in all of the 16 age groups, from 10 day old to 3+ years old. The present findings suggest that the formation and development of dentition in the mouth of Salverinus pluvius are associated with the age rather than with body length.

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