農業部-水產試驗所全球資訊網農業部-水產試驗所全球資訊網

在魚類的個體發生過程中，變態是界於仔魚期及稚魚其中間的階段。對很多魚類而言，在變態過程間或稍後的階段經常會有較高的死亡率，此包括石斑魚在內。對石斑魚苗而言，此時的高死亡率可能是水質、疾病及殘食造成。但如果我們考慮石斑魚在變態時期，內部及外部的型態都有很大的變化，則這些器官系統如果未能成功地由仔魚期形式轉變為稚魚期形式，則亦可能使得魚苗在此階段無法順利發育。然而，截至目前，對於石斑魚變態過程的研究仍相當少見，因此我們擬在本研究中利用組織切片的方式，調查石斑魚變態過程中消化道及甲狀腺的變化，此兩器官系統是否能在變態過程中成功地轉換，攸關石斑魚苗的育成率高低，因此本研究對於石斑魚育苗將有相當的助益。

In ontogeny of fish, metamorphosis is a phase between larval and juvenile periods.Elevated mortality rates during or shortly after metamorphosis have reported for manyfishes, and grouper are ones of them. The high mortality could be caused bydeteriorating water quality, viral infection, and cannibalism. Additionally, sincemetamorphosis includes major changes in morphology, either internal or external,unsuccessful transitions of those from larval to juvenile periods could makemetamorphosis quite hazardous time for the developing fish. However, so far, rarestudies concerning metamorphosis of grouper have been reported. Herein, we willinvestigate development of digestive tract and thyroid of grouper with histologicalmethods. Successful transitions of the two organ systems during metamorphosis are vitalfor grouper fry. The basic study should be helpful for larviculture of grouper.