DEVELOPMENT OF DIGESTIVE ORGANS AND FEEDING ABILITY IN LARVAE OF JAPANESE EEL (ANGUILLA-JAPONICA)
DEVELOPMENT OF DIGESTIVE ORGANS AND FEEDING ABILITY IN LARVAE OF JAPANESE EEL (ANGUILLA-JAPONICA)
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DOI：
10.1139/f95-101
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发表时间：
1995-05-01
影响因子：
2.4
通讯作者：
HIROSE, K
中科院分区：
文献类型：
--
作者：
KUROKAWA, T;KAGAWA, H;HIROSE, K
作为对日本鳗鱼早期生活研究的一部分，在孵化后的13 d内观察了消化器官的发育。消化道仅在孵化时在咽处形成；导管后部在草后1d分化。胰腺和肝脏在3 DPH时开始发育。使用鳗鱼胰蛋白酶原抗体的免疫组织化学显示，弱信号在6 DPH时首先出现在胰腺中，这表明鳗鱼胰腺在6 DPH时开始合成消化酶。7 DPH时免疫组化信号增强，开口方向由腹侧转向前侧，肠道分化为小肠和直肠，蛋黄被吸收。在13 d龄幼虫的消化道中首次观察到轮虫。我们从消化器官的发育过程推断，幼虫在7 DPH时开始摄食，这比首次摄食的观察时间要早。
As part of a study on the early life of Japanese eel, the development of the digestive organs was observed during the 13 d after hatching. The digestive tract was formed only at the pharynx at hatching; the posterior part of the duct differentiated during 1 d posthatch (DPH). Pancreas and liver started to develop at 3 DPH. Immunohistochemistry using an antibody to eel trypsinogen showed weak signals first appearing in the pancreas at 6 DPH, suggesting that the eel pancreas starts to synthesize digestive enzymes at 6 DPH. The immunohistochemical signals became strong at 7 DPH, at which time the mouth opening orientation moved from ventral to anterior, the intestine differentiated into small intestine and rectum and the yolk was absorbed. Rotifers were first observed in the digestive tract of 13-d-old larvae. We inferred from the developmental process of the digestive organs that the larvae can start feeding at 7 DPH, which is earlier than observations of first feeding.