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The internal defense system of mollusks consists of circulating haemocytes. In order to understand the morphological characterization of haemocytes, light and electron microscopy were carried out in oyster, Crassostera gigas. Four types of haemocytes were recognized: type Ⅰ small hyalinocytes, type ...

The internal defense system of mollusks consists of circulating haemocytes. In order to understand the morphological characterization of haemocytes, light and electron microscopy were carried out in oyster, Crassostera gigas. Four types of haemocytes were recognized: type Ⅰ small hyalinocytes, type Ⅱ large hyalinocytes, type Ⅲ large granulocytes and type Ⅳ small granulocytes. Additionally, the activities of alkaline phosphatase (ALP), acid phosphatase (ACP), peroxidase (POD), α-naphthyl acetate esterase, β-glucuronidase, PAS, sudan black B and oil red O in haemocytes were analysed by immunocytochemical methods. The results indicate that enzymatic activities were abundant and more active in granulocytes than in hyalinocytes. After incubation with haemoctyes and Vibrio FKC, phagocytic index and percentage of phagocytic cell were and shown to be increased from 15 to 120 min. In addition, the enzymatic activities were higher than those of controls: ALP, ACP, α-naphthyl acetate esterase and β-glcuronidase, indicating that these enzymes can be related with phagocytosis in oyster.

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